I really appreciate the comment. Thanks for watching and commenting. The channel is slowly growing. Might not be huge today but comments like yours surely motivate me to keep putting these together. Thanks!
Great video. I think its given me the confidence to rebuild my first 4 stroke. Built plenty of 2 strokes with my Dad but now that he's in Heaven, I've got to do this bike on my own. Thanks for taking the time to document and edit. Many arent aware of what goes into it.
Thanks man and I appreciate it! Yeah you can do this. Its only a little different than a 2 stroke mainly cam timing and crap. But if you take your time and go step by step, you got this!
@@tredeuce ok. Yeah I just seen this on Facebook, small world lol. I replied to it... "I see this happen when the fuel octane is low, or timing is advanced too far, or (and most common) when people let the bike sit for a couple months then take it out for a ride without removing the fuel in the tank and starting with fresh fuel. Detonation, splits the piston."
Thanks! 240 hours! Right on! These are reliable and strong bikes if maintained well thats for sure. Probably the most reliable currently on the market.
Thanks for the video! You helped walk me through swapping my cylinder head after I found my spark plug had been stripped by Yamaha during assembly. The only thing that held me up was having to order valve seals. I appreciate the help!
Thanks for taking the time to put this video together. I have the same bike and followed this step by step when replacing the top end, which I had never done on a 4 stroke before. The whole process went smooth and she runs great!
Nice! Thats good news and good job! Funny, yesterday I also followed one of my own videos on doing a top end on a KTM 250 SXF. With instructions I think that was the fastest I ever done one lol
I have a 2020 yz450f it had 135hrs on it After watching this video and using service manual I successfully completed The top end valve removal and cleaning checked clearances also timing chain thanks I’m very appreciative
@@UpAllNight91 I’ve been a hvac technician for 25yrs I’ve changed services the forks 3 times changed the whole clutch to gytr but was a lil intimidated by the engine lol but it did take me a lot longer than you to complete
For removing the nut on the magneto - if nervous about sticking that impact on there. In the manual it demonstrates that you can use to wrenches to remove it. There would be no need to remove opposite side cover and wedge something to keep it from turning. Appreciate the video!
Thats good info! I honestly never noticed there was a spot on the stator that allows wrenches to be used. Wish I included that info in this video. But I will surely mention that next time. Thanks!
Best video on here without a doubt 👍 very descriptive & easy to understand. I’ve been looking for a video just like this but nobody else seems to explain as you do 👌
Thanks man, that's what I make these for. I try my best to get someone who has the ability to get through the job. Not selling tools and not showing off., just trying to get people back on the bike and pass along what I have learned. And when I'm stuck and need help I too look on youtube and often there's someone else who has done the same and I'm thankful. Thanks for commenting and I appreciate you!
Thanks. Yes, I usually dont worry about oiling the cams so long as the oil that one them wasnt cleaned off. But if I use a cleaner on them then I will coat them with oil. Thanks for watching!
Hello. Thanks! The header wraps around the motor so the header can be at the desired tuned length for the best engine performance. Kinda like long tube headers on cars.
Thanks! Therapy is good! I know the feeling lol. On nickle plated cylinders there is no need to go up a size on the piston, The cylinders are very robust and hardly wear and a size up would be too big. As long as the cylinder is in good shape (which is usually the case) just install a fresh stock size piston and run her! I actually did a video cylinders, I think it might help explain better. Here is a link ua-cam.com/video/AoQ4_aqVjto/v-deo.html . Thanks for watching and commenting!
@@UpAllNight91 thank you very much mate absolutely brilliant videos, never want them to end. I will watch that video you linked on cylinders. Ive just got my first crf450r after only having 2 strokes before. This bike is beautiful and I'm learning how to work on it before I need to. I take it it will have a nickel plated cylinder? 😂 Thanks again buddy, Irish but living in Scotland so your vids are getting out there 👌
@@UpAllNight91 it's a 2018 mate, she's a minter, haven't had it on track yet I'm a bit nervous about it to be honest ha. Noticed it has a single cam too which looks handy to work on.
@@jaimieboy999 Right on! Thats a good bike. The single cam does make it a little easier for sure. I asked because I wanted to see if I had any videos that fit your bike. I do have a top end video on your bike if interested. Here is a link ua-cam.com/video/FWt7Ws40Fl4/v-deo.html
nice wrist pin technique. ive always had trouble with them. how many hours on this bike? my son has a 2023 model but weve always ridden 2 strokes so this will be my first time getting into a 4 or prepping for it anyways.
Thanks. Can't remember how many hours where on this bike at the time but I wanna say about 60. On 4 strokes I suggest a top at 60 to 100 hours for a 450 (depending on how hard shes used) and 45 to 75 hours on a 250f. Again depending on how hard she is used. Vet riders who torque their 450s around can totally get 100 hours out of a piston but young and very fast kids will probably wanna do their 250f at 45 lol
Awesome video! Just wondering what you do for cylinder prep, ive read scotch brite to break the glazing so your new rings will seat, if so what grit to use, thanks again, for giving me the confidence to do this!!!
Hello. On a healthy cylinder that shows good cross hatching there really is no need to do anything but wipe it clean. But you can use scotch bright or a fine steal wool and clean up the cylinder if needed or desired. Anything mild so it only cleans the surface is good. On my own 450s the cylinder always looked good and just a cleaning is all that was needed.
I got a bill from the local yamaha dealership for 15 hours of labor just to replace an intake valve. Watching this, it appears like that should take 4-6 hours for a single valve job. Is this shop taking me for a ride estimating 15 hours of labor to break down the bike, replace an intake valve, and reassemble?
That dues seem like a lot of hours for this job. Some shops always aim high, not knowing what hang ups they might run into during the job but 15 surely feels a little high.
Hello. it is slightly different but very similar. If you follow this video but also follow the manual on your bike for the torque specs and things like that you should have no problem. Here is a link to where you can download the manual for free library.ymcapps.net/library/om/app/index.html?baseCode=6150&langId=02
Hello. It was my friend Ian's bike, he moved to Texas. Not sure what part, will ask him. He's been there for a few weeks now and hasn't gotta a chance to ride yet.
Great informative video - thanks for all the tips - saved time and a lot of foul language!! - you can't get this sort of guidance from the manual - thanks.
How often would you suggest doing a top end on these? I’ve heard the Yamahas are good for a top end for about 100 hours but that it’s good to still check valves and timing chain around 50 hours
Hello. In my experience I would say the YZ450 is surely good for 100 hours on a top end and timing chain. I do suggest shorting this to 60 hours if the rider is advanced and really works the motor but for the average rider 100 hours is fine for the piston and the timing chain. Also the valves will normally not need a adjustment by 100 hours as long as good filter maintenance is maintained and no dirt gets in the motor. It doesn't hurt to check the valves around 50 hours but most likely a adjustment will not be required as long as no dirt has gotten past the filter.
Hey great video! Thank you! On my 16 wr450 I Just replaced timing chain and bike is back together idling high? Not sure what I could have knocked. Breather hose is attached. All boots look good. Any thoughts?
First thought is the choke knob. Make sure the choke is not on. Next thing I would check is if the throttle is not being hung open a little. When you chop the throttle do you hear the throttle blade hit the throttle stop?
@@UpAllNight91 hey thanks for the quick reply! I checked both those. They Seem ok. Would any adjustments to timing affect idle? I think it might have been off a little. I know I knocked the 1/2 pipe around a lot under the throttle body…..
@@jamesbarber6165 i never seen cam timing cause a higher idle. There is a idle speed adjustment screw. Maybe try turning it outward to see if you can bring it down some. If that doesn't help lower it then I would surely check that a throttle cable or something is not hanging up the throttle body from closing all the way
Also did you remove the injector from the throttle body while doing the job? Sometimes that seal for the injector to throttle body is a tough one to get back in and sealed well.
just rebuilt my 21 yz450f by the manuals instruction, was bogging/backfiring when revving in neutral after the rebuild. changed the gas and that helped but still wasnt running all the way right. testing the fuel pump and it died while testing it so i got a new one today and and it runs worse than ever before. backfires pretty bad any time you give it throttle and cant even get it to rev up. in the manual it says when installing the cams make sure the timing marks are on the joint of the timing chain and not the center of the link. after seeing how this one was with the marks on the center of the link im thinking i may be out of time a tooth
Oh yeah I would recheck that. I also would connect with your phone and check to see if the throttle position sensor is working and ready. They will do what you are describing if the TPS has a bad connection or is bad
@@UpAllNight91 thanks for the fast reply man! I thought about that earlier and tried it and it reads the throttle but takes a few seconds for it to show the throttle input on my phone. Do you know if that’s normal or does it usually show the throttle input pretty fast? I’m not getting any codes for anything
@@OG_aaronlee it's probably normal to read slow or delayed. But as long as it reads i would call it good. Maybe also pull the fuel injector, check the inlet in it for trash and make sure nothing not in the fuel lines while it was apart
@@UpAllNight91 thanks man, ill check it out this weekend. this bike has been a headache ever since i got it a couple months ago haha. i appreciate the help
I install the pistons dry, no lube. Faster ring seat and far less likely to end up with a bike that smokes. For the cam journals and such, if they are still oily from the last run they are ok to just install but if you clean them up with brake cleaner or something then a coating of motor oil is fine, if I do use assembly lube I use the Maxima assembly lube but any brand will be good. Keep in mind these parts will have oil on them within 3 seconds after start up so its not necessary to load them up with lube, just a little so its good for 3 seconds is all that's needed.
@@UpAllNight91 Sorry to bug you again on this video. Just doing the camshaft and timing chain installation and when looking at the yamaha manual they have a very specific way of lining up the camshaft dots to the flats on the head and they also say to have the dots in a certain link on the timing chain. My problem im having is if i line up the dots to the head flats im off one tooth on the chain according to the book. Maybe because i didnt line up the 2 or 3 teeth on the timing chain correctly on the crankshaft?
I don't see anything wrong with removing carbon off the combustion chamber while valves are seated. I would be careful no to scratch the surface with like a wire brush or anything. You don't want to remove any of the heads material. Maybe a scotchbright pad at most.
I’m curious, it seems the reason you shim valve is because of valve recession. If clearance is 0.1-0.17 wouldn’t you want 0.17? A bigger clearance so as the valves wear into the head that clearance gets smaller. So instead of a bigger shim that makes the clearance tighter why not go with a smaller to make the clearance closer to 0.17?
Well there is also valve stem tip wear, and valve shims wear down as well which can increase the clearance. Usually if everything works perfectly as the valve recedes into the valve seat, the valves stem tip and shim wears in and keeps the clearance near the same.
Honestly don't remember but a new set usually reach around 45 foot pounds, however a old set of head bolts that been used too many times can reach well over 55 pounds. Its best to replace the head bolts every other top end. I only reuse them once to be safe
My experience is mostly track use. For track use I subscribe to no longer than 100 hours on a top end on a 450. And if the rider is very fast and uses the bike hard then every 60 hours to be safe as its also a general inspection on the crank and all.
Hello. If you have the gytr tuner I would hook that up and check the sensors readings. Mainly the TPS reading. Make sure it's working well. Without a scanner then I would start by making sure all the sensors and such have a good connection, try unplugging everything like the TPS and the intake air sensor and making sure the connection is clean then reconnect real well. I suspect sometime is not connected well.
I am retired and am looking at buying a new YZ450FX bike for just easy trail riding up in far northeastern Wisconsin most of my riding would be dual track woods roads. My concern on this bike is how long I can use it without a top end rebuild or a complete rebuild? I am very fussy about my maintenance oil changes, air filter cleaning and valve adjustments. Any estimate would be great.
Hello. Under heavy use on a MX track a yz450 is usually good for 100 hours on a top end. However I suggest 60 hours or even sooner if the rider is faster (A or B level rider). If the 450 is used for easy trail riding and not being hammered on from corner to corner, I have seen them go upwards of 200 hours on a single piston in conditions like that. The valves hardly go out of adjustment on these modern bikes as long as sand and dirt don't get past the filter. I personally would still do the piston at 100 hours even if I was riding it easy in the trails.
@@patrickwilliams9611 I have a 2017 Suzuki DRZ400S right now it's a great bike but it is way too heavy and the handling in the woods isn't the greatest. I have modded it for woods riding good knobby tires geared it down JD jet kit 3x3 air box mod. Just want something more capable. If I want to ride on the street I will ride my Hayabusa.
Depends on what your looking for. Putting valve clearance on the tighter side of the specs both intake and exhaust will slightly increase valve overlap which will slightly increase peak HP. However if you want to adjust the valves and have the best chance of not needing to adjust again for a long time then put the exhaust valves on the tighter side of the specs and the intake valves on the looser end of the specs. Since the intake usually gets tighter through time and the exhaust usually gets looser through time.
Where you located I need my bike fix yz450f 2021 something with air or fuel I put a new air filter but when I crank up and tap throttle sound like something getting too much air
Yamaha calls it a crankcase cover gasket but most call it a stator cover gasket, Here is a link to it www.partzilla.com/product/yamaha/BR9-15451-00-00?ref=d33ebe16816bcf47b8a88b1cda106e14ab950e01
@@UpAllNight91 just ordered everything I seen in your vid and am sooooo looking forward to doing this.. it's been 10 years since this bikes had new everything and so far I've watched all your vids and did everything on the bike but this but that's all gonna change in one week.. thanks for taking the time to.put vids together like this one and the others.. it truly means alot and I can't begin to thank you enough for this as well as the responses..
If coolant comes out of the overflow the bike is either too hot or the radiator cap needs replacing. These bikes get hot vary fast and need to be started up and riden almost right away to stay cool. They can go from ice cold to overheating and pushing coolant out the overflow within 5 minutes on the stand. They do not have coolant fans like a car or a street bike. They need to be rolling to get air through the radiators to keep them cool
Could you please send me a link for all of what you bought for a 2014 yz450f, please and if you do thank you. I just would like to get everything that you got going on right there
Hello. There is not a way I can add the the parts in a cart and send a link to it. But I ordered these parts from www.rockymountainatvmc.com . I put together a video on how to search up and order OEM parts. If you watch it (link to video below), it should walk you through ordering these up. If you run into any questions let me know and I will help out. Here is the link... ua-cam.com/video/slOfGOMQshs/v-deo.html
@@idecidenotyou Hello. Here is a link to the OEM piston kit www.partzilla.com/product/yamaha/1SL-116A0-00-00?ref=3484c3972662817c6d77171c9b3468a07435bb37
I suggest a top end every 60 hours (100 hours if the rider is easy on the motor). And a new timing change every other top end if top ends are done at 60 hours and every top end if top ends are done at 100 hours. At 200 hours I suggest a new crank, crank bearings, new valves and valve springs .
Thank you for the in depth teardown. I've been putting off checking the valves on mine for ages because I've never had to go inside an engine before.
You welcome. Thanks for watching!
You deserve way more subscribers. This content is literally invaluable and it's available for free for everyone! Great work man
I really appreciate the comment. Thanks for watching and commenting. The channel is slowly growing. Might not be huge today but comments like yours surely motivate me to keep putting these together. Thanks!
Great video. I think its given me the confidence to rebuild my first 4 stroke. Built plenty of 2 strokes with my Dad but now that he's in Heaven, I've got to do this bike on my own. Thanks for taking the time to document and edit. Many arent aware of what goes into it.
Thanks man and I appreciate it! Yeah you can do this. Its only a little different than a 2 stroke mainly cam timing and crap. But if you take your time and go step by step, you got this!
@@UpAllNight91 I make sure to keep referencing back to your video. Got it apart today. Cracked piston. 65 hours on the bike. I run Shell 93 in it.
@@tredeuce was it a split crack across the top of the piston?
@@UpAllNight91 Yep! Cracked down from the dome to the top of the wrist pin.
@@tredeuce ok. Yeah I just seen this on Facebook, small world lol. I replied to it... "I see this happen when the fuel octane is low, or timing is advanced too far, or (and most common) when people let the bike sit for a couple months then take it out for a ride without removing the fuel in the tank and starting with fresh fuel. Detonation, splits the piston."
Thank you Brotha I’m ready to open up my 22 now I’m at 240 hours and she still running like no problems
Thanks! 240 hours! Right on! These are reliable and strong bikes if maintained well thats for sure. Probably the most reliable currently on the market.
Thanks for the video! You helped walk me through swapping my cylinder head after I found my spark plug had been stripped by Yamaha during assembly. The only thing that held me up was having to order valve seals. I appreciate the help!
Ahh thats awesome to hear! Glad it helped!
Thanks for taking the time to put this video together. I have the same bike and followed this step by step when replacing the top end, which I had never done on a 4 stroke before. The whole process went smooth and she runs great!
Nice! Thats good news and good job! Funny, yesterday I also followed one of my own videos on doing a top end on a KTM 250 SXF. With instructions I think that was the fastest I ever done one lol
MY MAN ! Thanks god you're here, you can't imagine how many time you help me! Every time i look for something you're here ! thanks a lot !
Ahh, thats great to hear! Glad these have been of help!
I have a 2020 yz450f it had 135hrs on it
After watching this video and using service manual I successfully completed The top end valve removal and cleaning checked clearances also timing chain thanks I’m very appreciative
Ahh man thats too cool! Good job! Appreciate you letting me know
@@UpAllNight91 I’ve been a hvac technician for 25yrs
I’ve changed services the forks 3 times changed the whole clutch to gytr but was a lil intimidated by the engine lol but it did take me a lot longer than you to complete
@@Irishsean35 nice! Nothing wrong with taking time. Especially if its your first time.
Your videos are absolutely fantastic!! Subscribed. Please keep it up!
Awesome thanks and welcome aboard!
Great video man very very detailed and well explained you have helped me rebuild my bike thank you very very much
Awesome!
For removing the nut on the magneto - if nervous about sticking that impact on there. In the manual it demonstrates that you can use to wrenches to remove it. There would be no need to remove opposite side cover and wedge something to keep it from turning. Appreciate the video!
Thats good info! I honestly never noticed there was a spot on the stator that allows wrenches to be used. Wish I included that info in this video. But I will surely mention that next time. Thanks!
Good video man. Im about to do the top end on my 21 too and this helped as i never had a yamaha apart yet.
Thanks! Glad to hear it will be of help. Let me know if any questions come up
Best video on here without a doubt 👍 very descriptive & easy to understand. I’ve been looking for a video just like this but nobody else seems to explain as you do 👌
Thanks man! Glad to hear that it will help!
Thank you for a great video - greetings from Finland!
Hello Finland! Thanks!
I will not lie I just want to thank you for making this video it’s helped me out a lot
Thanks man, that's what I make these for. I try my best to get someone who has the ability to get through the job. Not selling tools and not showing off., just trying to get people back on the bike and pass along what I have learned. And when I'm stuck and need help I too look on youtube and often there's someone else who has done the same and I'm thankful. Thanks for commenting and I appreciate you!
Another great video!!!
Thanks!
youre a legend, thanks
Your welcome!
what a video thank you!!! best video in youtube
Your welcome and thanks!
What an amazing video with detail this will help a lot of people
Thank you Bro so much!!! Peace from Germany.
Thanks Brother!👍
This guy has saved me
Found this useful on the chain tensioner booughat Lowes can’t make photo tiny socket set Kobalt mixed with a torex
Right on, I think I know what your talking about
What a job
I just did this I appreciate it a lot
Right on!
Excellent video, watched the whole thing and glad I did! Thank you for the great work and content!!
Your welcome and thanks! Appreciate you watching!
Fantastic work!!! Thanks so much for this knowledge
Cool youtube name! Yeah thank you!
Best video ever bro. U have so many tips, really appreciate the vid. Thank u.
Awesome Video. I will start tomorrow revise my 250 2021, what is the same stuff almost.
Yes sir. If its a YZ250F I have a video directly for that bike. Here is a link... ua-cam.com/video/zNGWf-KIP3E/v-deo.html
@@UpAllNight91 unbelievable, thats even better. No nothing can stop me 😉. Thanks from Germany
@@barbenfischen Yes sir! best of luck!
Great video. Appreciate all the talk through and explanation.
Thanks, and appreciate you watching!
Great video, but you should assemble cams with oil in the journals and on the buckets.
Thanks. Yes, I usually dont worry about oiling the cams so long as the oil that one them wasnt cleaned off. But if I use a cleaner on them then I will coat them with oil. Thanks for watching!
Thanks a lot, now i Can buy a 450
Watching this from Jerusalem man, thank you so much for the tips along the video
Oh man thats too cool! Jerusalem!
Good job sir. I wonder why exhaust pipe makes loop araund cilinder head? it cant be to short or due to other factors?
Hello. Thanks! The header wraps around the motor so the header can be at the desired tuned length for the best engine performance. Kinda like long tube headers on cars.
Fantastic mate very helpful
Thanks man! Glad it helped!
Hi nate. Do you go up a zize in piston on its first top end job? Love the videos btw, been mechanical therapy!
Thanks! Therapy is good! I know the feeling lol. On nickle plated cylinders there is no need to go up a size on the piston, The cylinders are very robust and hardly wear and a size up would be too big. As long as the cylinder is in good shape (which is usually the case) just install a fresh stock size piston and run her! I actually did a video cylinders, I think it might help explain better. Here is a link ua-cam.com/video/AoQ4_aqVjto/v-deo.html . Thanks for watching and commenting!
@@UpAllNight91 thank you very much mate absolutely brilliant videos, never want them to end. I will watch that video you linked on cylinders. Ive just got my first crf450r after only having 2 strokes before. This bike is beautiful and I'm learning how to work on it before I need to. I take it it will have a nickel plated cylinder? 😂 Thanks again buddy, Irish but living in Scotland so your vids are getting out there 👌
Thats awesome to hear its being seen all the way over there! What year is your CRF450?
@@UpAllNight91 it's a 2018 mate, she's a minter, haven't had it on track yet I'm a bit nervous about it to be honest ha. Noticed it has a single cam too which looks handy to work on.
@@jaimieboy999 Right on! Thats a good bike. The single cam does make it a little easier for sure. I asked because I wanted to see if I had any videos that fit your bike. I do have a top end video on your bike if interested. Here is a link ua-cam.com/video/FWt7Ws40Fl4/v-deo.html
Great video , i have a 18 , yamaha changed that whole camshaft area on top , plus they went back to 4 valves ?
Thanks! They went back to 4 valves starting in 2010. Something about not needing the 5th valve anymore with fuel injection.
This is great content. Thank you! I'm wondering if this could be a similar job as on a WR450F 2017 ?
Thanks. Yes it will be very similar to your 2017 wr450f. Ve sure to download the manual for the head torque specs though
nice wrist pin technique. ive always had trouble with them. how many hours on this bike? my son has a 2023 model but weve always ridden 2 strokes so this will be my first time getting into a 4 or prepping for it anyways.
Thanks. Can't remember how many hours where on this bike at the time but I wanna say about 60. On 4 strokes I suggest a top at 60 to 100 hours for a 450 (depending on how hard shes used) and 45 to 75 hours on a 250f. Again depending on how hard she is used. Vet riders who torque their 450s around can totally get 100 hours out of a piston but young and very fast kids will probably wanna do their 250f at 45 lol
Awesome video! Just wondering what you do for cylinder prep, ive read scotch brite to break the glazing so your new rings will seat, if so what grit to use, thanks again, for giving me the confidence to do this!!!
Hello. On a healthy cylinder that shows good cross hatching there really is no need to do anything but wipe it clean. But you can use scotch bright or a fine steal wool and clean up the cylinder if needed or desired. Anything mild so it only cleans the surface is good. On my own 450s the cylinder always looked good and just a cleaning is all that was needed.
Love the videos man
Thanks man!!!
I was always told to use the new valves to seat and to make aure they are labeled and go to the same port.
Yes. If a used valve is removed and will be put back in, its always to be put back into the same port.
I got a bill from the local yamaha dealership for 15 hours of labor just to replace an intake valve. Watching this, it appears like that should take 4-6 hours for a single valve job. Is this shop taking me for a ride estimating 15 hours of labor to break down the bike, replace an intake valve, and reassemble?
That dues seem like a lot of hours for this job. Some shops always aim high, not knowing what hang ups they might run into during the job but 15 surely feels a little high.
Is the procedure similar for a 2018 wr250f? Also, whats the shim size in this case? Btw what a great video, so easy to understand! Keep it up!
Hello. it is slightly different but very similar. If you follow this video but also follow the manual on your bike for the torque specs and things like that you should have no problem. Here is a link to where you can download the manual for free library.ymcapps.net/library/om/app/index.html?baseCode=6150&langId=02
@@UpAllNight91 appreciate it man! And do you know what diameter the shims are? Just to make sure i buy the right ones after checking my valves
@@TheMadMonkey3 9.48mm
Thx for the grease tip, never thought of that. What part of Texas you riding?
Hello. It was my friend Ian's bike, he moved to Texas. Not sure what part, will ask him. He's been there for a few weeks now and hasn't gotta a chance to ride yet.
I moved to San antonio area going to check out cycle ranch and s few other places
Great informative video - thanks for all the tips - saved time and a lot of foul language!! - you can't get this sort of guidance from the manual - thanks.
Thanks man! Appreciate the comment! Glad it helped
How often would you suggest doing a top end on these? I’ve heard the Yamahas are good for a top end for about 100 hours but that it’s good to still check valves and timing chain around 50 hours
Hello. In my experience I would say the YZ450 is surely good for 100 hours on a top end and timing chain. I do suggest shorting this to 60 hours if the rider is advanced and really works the motor but for the average rider 100 hours is fine for the piston and the timing chain. Also the valves will normally not need a adjustment by 100 hours as long as good filter maintenance is maintained and no dirt gets in the motor. It doesn't hurt to check the valves around 50 hours but most likely a adjustment will not be required as long as no dirt has gotten past the filter.
Great vid mate 🤟👍
Thanks man! And thanks for watching!
Id definitely yank the motor for this for my personal bike anyways
Im im working on my 2020 yz450f
I bet you love it when people bring you a dirty bike for engine work lol
LoL. Cleaner is better for sure. What is also a pain is when someone brings me a motor to rebuild and they left it full of oil lol
What would cause deceleration popping? Intake and exhaust valves are good and there are no exhaust leaks
Usually lean causes popping. Sometimes if the idle speed is set high on these fuel injection yamahas it can pop on decel
Hey great video! Thank you! On my 16 wr450 I Just replaced timing chain and bike is back together idling high? Not sure what I could have knocked. Breather hose is attached. All boots look good. Any thoughts?
First thought is the choke knob. Make sure the choke is not on. Next thing I would check is if the throttle is not being hung open a little. When you chop the throttle do you hear the throttle blade hit the throttle stop?
@@UpAllNight91 hey thanks for the quick reply! I checked both those. They Seem ok. Would any adjustments to timing affect idle? I think it might have been off a little. I know I knocked the 1/2 pipe around a lot under the throttle body…..
@@jamesbarber6165 i never seen cam timing cause a higher idle. There is a idle speed adjustment screw. Maybe try turning it outward to see if you can bring it down some. If that doesn't help lower it then I would surely check that a throttle cable or something is not hanging up the throttle body from closing all the way
@@UpAllNight91 ya Ill mess with the idle knob Thank you!!!!!
Also did you remove the injector from the throttle body while doing the job? Sometimes that seal for the injector to throttle body is a tough one to get back in and sealed well.
just rebuilt my 21 yz450f by the manuals instruction, was bogging/backfiring when revving in neutral after the rebuild. changed the gas and that helped but still wasnt running all the way right. testing the fuel pump and it died while testing it so i got a new one today and and it runs worse than ever before. backfires pretty bad any time you give it throttle and cant even get it to rev up. in the manual it says when installing the cams make sure the timing marks are on the joint of the timing chain and not the center of the link. after seeing how this one was with the marks on the center of the link im thinking i may be out of time a tooth
Oh yeah I would recheck that. I also would connect with your phone and check to see if the throttle position sensor is working and ready. They will do what you are describing if the TPS has a bad connection or is bad
@@UpAllNight91 thanks for the fast reply man! I thought about that earlier and tried it and it reads the throttle but takes a few seconds for it to show the throttle input on my phone. Do you know if that’s normal or does it usually show the throttle input pretty fast? I’m not getting any codes for anything
@@OG_aaronlee it's probably normal to read slow or delayed. But as long as it reads i would call it good. Maybe also pull the fuel injector, check the inlet in it for trash and make sure nothing not in the fuel lines while it was apart
@@UpAllNight91 thanks man, ill check it out this weekend. this bike has been a headache ever since i got it a couple months ago haha. i appreciate the help
@@OG_aaronlee oh man thats a bummer. Yeah let me know what you find or how it goes
Can’t remember if you mentioned it in the video or not but what assembly lube to you put on everything as you reassemble the top end?
I install the pistons dry, no lube. Faster ring seat and far less likely to end up with a bike that smokes. For the cam journals and such, if they are still oily from the last run they are ok to just install but if you clean them up with brake cleaner or something then a coating of motor oil is fine, if I do use assembly lube I use the Maxima assembly lube but any brand will be good. Keep in mind these parts will have oil on them within 3 seconds after start up so its not necessary to load them up with lube, just a little so its good for 3 seconds is all that's needed.
@@UpAllNight91 thank you very much. Your videos are really good and appreciate all the help and the super informative videos you make.
@@Banga927 Thanks! Glad they are of help and your welcome!
@@UpAllNight91 Sorry to bug you again on this video. Just doing the camshaft and timing chain installation and when looking at the yamaha manual they have a very specific way of lining up the camshaft dots to the flats on the head and they also say to have the dots in a certain link on the timing chain. My problem im having is if i line up the dots to the head flats im off one tooth on the chain according to the book. Maybe because i didnt line up the 2 or 3 teeth on the timing chain correctly on the crankshaft?
@@23782263TBDM Thats correct. To match it up top you would have to get back down by the crank and move the chain down there by a link.
Where are you located in FL? Might need to some work done
Hello. I'm in Parrish Fl you can contact me by email at upallnight91@hotmail.com
@@UpAllNight91 dang I live on the east coast in St Augustine. Awesome job on the repairs!
@@cjm376 Thanks! Yeah thats like a 4 hour drive I think
Would you ever advise cleaning a combustion chamber without removing valves? I don’t need to do valves but the combustion chambers a bit nasty
I don't see anything wrong with removing carbon off the combustion chamber while valves are seated. I would be careful no to scratch the surface with like a wire brush or anything. You don't want to remove any of the heads material. Maybe a scotchbright pad at most.
@@UpAllNight91 thank you for your reply!
I’m curious, it seems the reason you shim valve is because of valve recession. If clearance is 0.1-0.17 wouldn’t you want 0.17? A bigger clearance so as the valves wear into the head that clearance gets smaller. So instead of a bigger shim that makes the clearance tighter why not go with a smaller to make the clearance closer to 0.17?
Well there is also valve stem tip wear, and valve shims wear down as well which can increase the clearance. Usually if everything works perfectly as the valve recedes into the valve seat, the valves stem tip and shim wears in and keeps the clearance near the same.
@@UpAllNight91 could you make a video explaining? I’ve always had questions about valve wear. What’s wearing, when they need to be replaced, etc.
@@nima3487 hello. Yes. I will include this info on my next video with a 4 stroke. Thanks and thanks for watching!
What’s the tool called that you’re using to squeeze the plastic releases?
For the fuel line? Fuel line pliers.
@@UpAllNight91 I should use critical thinking skills more often.
@@kellera1854 😅
Forgot to mention I’ve never did this before
Thats cool man. Valves too. Impressive actually
So did you check to see what your final torque number in foot pounds was?
I'm sorry its been a while since I made this video. What bolt or torque setting are you talking about
@@UpAllNight91 The head bolts.
Honestly don't remember but a new set usually reach around 45 foot pounds, however a old set of head bolts that been used too many times can reach well over 55 pounds. Its best to replace the head bolts every other top end. I only reuse them once to be safe
Nice at about how many hours you recommend a rebuild on a 2020 yz450fx
My experience is mostly track use. For track use I subscribe to no longer than 100 hours on a top end on a 450. And if the rider is very fast and uses the bike hard then every 60 hours to be safe as its also a general inspection on the crank and all.
Just curious how much do you charge for a job like this?
That's around 400 bucks labor
I did a top end on my 2014 yz450f I followed all youre steps but it starts but as soon as I hit the throttle it dies?
Hello. If you have the gytr tuner I would hook that up and check the sensors readings. Mainly the TPS reading. Make sure it's working well. Without a scanner then I would start by making sure all the sensors and such have a good connection, try unplugging everything like the TPS and the intake air sensor and making sure the connection is clean then reconnect real well. I suspect sometime is not connected well.
@@UpAllNight91 Thank you I will go ahead and look over all that
I am retired and am looking at buying a new YZ450FX bike for just easy trail riding up in far northeastern Wisconsin most of my riding would be dual track woods roads. My concern on this bike is how long I can use it without a top end rebuild or a complete rebuild? I am very fussy about my maintenance oil changes, air filter cleaning and valve adjustments. Any estimate would be great.
Hello. Under heavy use on a MX track a yz450 is usually good for 100 hours on a top end. However I suggest 60 hours or even sooner if the rider is faster (A or B level rider). If the 450 is used for easy trail riding and not being hammered on from corner to corner, I have seen them go upwards of 200 hours on a single piston in conditions like that. The valves hardly go out of adjustment on these modern bikes as long as sand and dirt don't get past the filter. I personally would still do the piston at 100 hours even if I was riding it easy in the trails.
@@UpAllNight91 Thanks for the reply.
@@billsharko3007 yes sir!
@@billsharko3007 just get a non mx bike like a drz650 much more reliable with out needing to replace parts so often
@@patrickwilliams9611 I have a 2017 Suzuki DRZ400S right now it's a great bike but it is way too heavy and the handling in the woods isn't the greatest. I have modded it for woods riding good knobby tires geared it down JD jet kit 3x3 air box mod. Just want something more capable. If I want to ride on the street I will ride my Hayabusa.
Why do you want valves tighter than looser when shimming?
Depends on what your looking for. Putting valve clearance on the tighter side of the specs both intake and exhaust will slightly increase valve overlap which will slightly increase peak HP. However if you want to adjust the valves and have the best chance of not needing to adjust again for a long time then put the exhaust valves on the tighter side of the specs and the intake valves on the looser end of the specs. Since the intake usually gets tighter through time and the exhaust usually gets looser through time.
@@UpAllNight91 right on thanks for the info
Where you located I need my bike fix yz450f 2021 something with air or fuel I put a new air filter but when I crank up and tap throttle sound like something getting too much air
I'm in Parrish Fl. It's kinda between Tampa and sarasota
Can I pay you too fix my bike
@@frankwashington794 hello. If you want to email me at upallnight91@hotmail.com I will see if I can help you out. Thanks
Where are you located?
Parrish Florida
Hi Mate are the shims a 9.48mm OD thanks
Hello. Yes you are correct.. 9.48mm.
What’s the flywheel puller size?
Hello. its a 24mm x 1.5mm thread puller.
Is this job exactly the same on a yz 250f
Yes. Pretty much the same
But the torque specs for the head are different. Be sure to download the manual for the torque specs on the head
Is that a crankcase cover gasket or ignition cover gasket
Yamaha calls it a crankcase cover gasket but most call it a stator cover gasket, Here is a link to it www.partzilla.com/product/yamaha/BR9-15451-00-00?ref=d33ebe16816bcf47b8a88b1cda106e14ab950e01
@@UpAllNight91 just ordered everything I seen in your vid and am sooooo looking forward to doing this.. it's been 10 years since this bikes had new everything and so far I've watched all your vids and did everything on the bike but this but that's all gonna change in one week.. thanks for taking the time to.put vids together like this one and the others.. it truly means alot and I can't begin to thank you enough for this as well as the responses..
@@idecidenotyou Ahh right on, Your welcome my friend. What make and model are you doing the rebuild on?
@@UpAllNight91 2014
@@UpAllNight91 yz450
Whats that pinching tool called?
Fuel line pliers
60degrees is what torque?
Not sure exactly. I just follow the steps as stated by the manual to torque them down.
I have that same bike.
Is it normal for the bike to leak coolant through the little hose when I hit the accelerator to limiter??
Or what causes it ?
If coolant comes out of the overflow the bike is either too hot or the radiator cap needs replacing. These bikes get hot vary fast and need to be started up and riden almost right away to stay cool. They can go from ice cold to overheating and pushing coolant out the overflow within 5 minutes on the stand. They do not have coolant fans like a car or a street bike. They need to be rolling to get air through the radiators to keep them cool
Could you please send me a link for all of what you bought for a 2014 yz450f, please and if you do thank you. I just would like to get everything that you got going on right there
Hello. There is not a way I can add the the parts in a cart and send a link to it. But I ordered these parts from www.rockymountainatvmc.com . I put together a video on how to search up and order OEM parts. If you watch it (link to video below), it should walk you through ordering these up. If you run into any questions let me know and I will help out. Here is the link... ua-cam.com/video/slOfGOMQshs/v-deo.html
@@UpAllNight91would you know what piston and rings are stock on a 2014 yz450f
@@idecidenotyou Hello. Here is a link to the OEM piston kit www.partzilla.com/product/yamaha/1SL-116A0-00-00?ref=3484c3972662817c6d77171c9b3468a07435bb37
@@UpAllNight91 also do I need to buy a timing chain tensioner gasket if iam doing a new timing chain
@@idecidenotyou Most times the tensioner gasket can be reused if its in good shape but it is always good to get a new one.
Ive got a 2016 yz450f with 91 hours and a new top at 60 hours. What should i be doing next im naive to 4 strokes.
I suggest a top end every 60 hours (100 hours if the rider is easy on the motor). And a new timing change every other top end if top ends are done at 60 hours and every top end if top ends are done at 100 hours. At 200 hours I suggest a new crank, crank bearings, new valves and valve springs .
@@UpAllNight91 thank you much 🤙
@@dbambino775 yes sir!