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- Опубліковано 21 бер 2024
- Come along as I dig in to figure out why this 2020 YZ250F wont start and run. It has multiple issues from a bad fuel pump, broken plug, and needing new valves.
Link to a top end job walk through... • 1:11 Top End Rebuild. ...
Link to doing a fuel pump repair... • 1:11 YZ250F Fuel Pump ...
Donate Race Fuel link... www.paypal.com...
Thanks for watching!
upallnight91@hotmail.com
Hands down the best channel for learning how to do this stuff on your own. Super clear, everything is explained properly, and it shows that youve got knowledge on these things. Cant thank you enough. Adjusted valves on my ‘18 WR250f thanks to you!
Thanks!!! Thats awesome to hear! So happy to hear these are helping!
The best mechanic on UA-cam. Truly a professional.
Thanks!
Love it when Beavis comes in to help. LOL
LoL, He comes to help me to learn to always keep my eyes open ;p;
That's awesome about Stuck Nutz!!! I really hope you end up with them being a sponsor of your channel.
Right on. I received my Stuck Nutz package this weekend with decals and all. pretty cool. Looking forward to showing that off! The simple things often make me happy lol
Bro love how detail your content is looking forward to watching the next vid keep them coming man
Thanks brother! I sure will!
Love to see you do a comparison between stainless steel verses titanium valves. Testing longevity and performance.
Hello. Thanks for the suggestion. I probably wont be able to do this comparison because I currently only own 2 strokes myself. But I can tell you stainless steel valves are heavier and require higher tension valve springs to keep them from floating. The stronger higher tension valve springs put more stress on the timing chain, guides, and also valve seats. I personally suggest sticking with the titanium valves on these high revving motors.
My initial guess was valve adjustment. Didn’t see the fuel pressure regulator issue coming. Got me thinking about replacing mine on my 17 450. It seems to always take 5-6 kicks hot or cold. Great and informative video Chris. Keepem coming. I especially like the troubleshooting vids.
Thanks brother! I had a 15 YZ450f and now I wish I didnt sell it lol. I wasnt riding it much compared to my 250 and 125 but now I would like to have her around. Check your fuel pressure, see if it holds well between kicks.
Great video. I was going nuts when you were taking it apart because I've done it twice now. You just did some stuff out of order and that cause your issues. Amazing how tough that plastic is AND it sits in fuel 24/7 365. Sounds like you snap something but just screwdriver slipping or a snap closing. 😂
Thanks! Yeah them Yamaha fuel pumps can be tough to take apart for sure.
That bike was barking like the best of them at the end.
Ohh yeah! She sounds so good. I was surprised. Made me wanna go ride her lol
My 2020 had the same it was a bad sparkplug cleaned it and all was good 76 hours on the bike rn
Right on! Thats good news!
Always learning!!! keep the good work! 👍
Yes Sir!
Man, you deserve more subscribers and love on this channel i love how detailed you are when it comes to these videos you just got a new subscriber. please continue to make troubleshooting videos and fix them they are a huge help to us novices!
Ahh thanks man! I will! I do have it planned to do more of these. Hopefully real soon here, as soon as they come in!
Just picked up a 90 DR250 that’s going to need a top end as the cam journals are toast. Even though the DR is sohc it’s looking pretty similar conceptually and this will be my first major 4 stroke project! Awesome as always
For sure about the same concept. Its like once you learn to work on one you will have the ability to figure out the other ones too.
It's also a good idea.Once you get it broken to go ahead and drop the oil and oil filter and put some fresh in...
Just tuning in
Yes Sir!
@@UpAllNight91 I really love these videos along with the race videos
@@RugsadventuresThanks! I have the Vforce4X review in the works. That will be done at the track with lots of go pro coverage. Hoping to do that tomorrow!
Hey mate my 4x just turned up looks sweet definitely different to the 3 so cant wait for your test.
For sure they are different looking. I already installed the 4X and about to load the bike up and get it ready for tomorrow. Hoping the track dries up enough by tomorrow for a good review!
Lol when he said rip that out like a tooth I kinda felt that lol 😂. Best quote when ripping seals out
🤣🤣🤣 I have told my dentist "I do the same thing you do, work in tight spots with little tools and cant make a mistake, except its a machine and not a human" But it does kinda feel the same
Dam ur good mechanic keep up good videos where all learning so much from u
Thanks, will do my best!
Best channel with the best details and info!
Thanks!
@@UpAllNight91 what state are you in btw? Oh and the chickens coming in to check on you and making sure you're doing a good job Also kills me lollll if they don't do the kakadoodledoo then it's not approved lollll
@@ronmor8237 LoL, yeah they surely make their rounds lol. Love them little guys. I'm in Parrish Florida.
No inspection by Bevas so far. Ah there he is checking out his workshop.
Oh yeah, he surely come in to test me lol.
Great job
Thanks!
Excellent video fella, very informative, cheers
Thank you sir! Appreciate ya!
To turn choke off u role the throttle back just a mm an it flips it off so u dont have to reach down an manually do it
Right! I do know most of these do that. But this one wasn't doing that for some reason. If you notice on the first start up when I blipped the throttle twice it didn't. Not sure why this bike doesn't but you are right most YZ250f's a quick blip pops the knob back out.
Excellent video, very informative. 🙏
Thanks!
Dude I just came across your channel last week and watched a couple videos and I just gotta say you are a BEAST!
You really know your stuff man and I’m learning soo much from you so I wanted to lyk that I appreciate you for spreading the love!
Thanks David! I appreciate you reaching out. Your comment put a smile on my face on this Easter morning. Thanks and hope your having a great Easter!
Got to keep them filters clean and oiled
For sure!!!
NO TIMING CHAIN? he will be back lol
Right.
Fantastic info about the fuel pressure regulator and pump diagnosis. Question, on a kick start EFI bike, can you activate the pump long enough to test pressure by kicking or do you need a separate power source to run the pump like the service manual procedures?
I have used the kick start lever to test pumps but its a real pain lol. In the video linked in the description of this video I show the pump being powered by a motorcycle battery on the bench to test it. You can use a motorcycle battery, car battery, any 12v battery to test the pump and is what I do.
Nice Work!
Thanks!
My first guess was fuel pump
Right on, surely the pump had issues.
Good afternoon, great content. I see you are in Florida, where about? I’m looking for a mechanic to do a top end and valve adjustment on a 2021 CRF 150R.
Hello. Thanks! I'm in Parrish which is between Tampa and Sarasota. You can reach me at upallnight91@hotmail.com if I'm not too far of a drive for you.
Hello, thanks for the video! when you lap the valve seats if you use the old wornuot valve won't the seats be lapped with the wrong pattern? i mean if the old valve is concave and you use it as a pattern won't the lapped seats be concave too??? i understand that you will not ruin the titanium coat, but in case of using steel valves should i use the old valve for lapping or the new steel one? thankssssssssssss
Hello and your welcome. I imagine it would if I worked at it long enough. I try to only lap it long enough to get a seal again. Typically I don't have to lap them and I try to avoid doing it unless its absolutely needed which is rarely but it does happen.Another viewer suggested the idea of using a new value for lapping only and then installing a new valve that wasn't used for the lapping, while that can be expensive that is a good option if extensive lapping is required. Yamaha manual doesn't state to use a new or old valve, they only say not to lap the new valve that will be used. With steal valves, it doesn't hurt to use the new steal valve but I think I would still try to use the old valve first if it only needs a quick easy lapping. But if its way out of wack and needs extensive lapping then a new valve is probably best.
I’m thinking foul plug but an hour and nine minute video more than likely the valves
Right on!
Could b out adjusted valves
Right on!
Hi bro, nice work here, can you explain how to adjust valves without the top death center?
I always learned that i should do it when the cylinder her is stuck do the motor. Thank you in advance.
Next time I have a bike that needs the valves adjusted only I will cover a video with doing a valve adjustment while the head is still on. But its honestly about the same as doing it on the bench.
I know how to do it on the bike, idk how u do it on the bench. Shouldn t valve clearance be measured in TDC?
@@verarian The reason they say to put it at top dead center is to insure all the valves are fully closed and the cams lobe are not making contact with the valve cam buckers. Meaning the valve is on the base circle of the cam. You can do that on the bench by rotating the cam till the lobe of the valve is facing up and then checking the valve clearance.
@@UpAllNight91 Now it males sense to me thank you bro
Had a question ( finding a little play on the left of flywheel sator looks like oil splash paddle could connect to the water pump on other side in the left side of crank on shifter side I will send photo
Hello. Yes please send some pics to upallnight91@hotmail.com
Always lap in the seat with the new valve ,DONT use the old valve .
The point of lapping is to mate 2 surfaces .
Non sense using old valve.
Hello. In most cases like on automobiles and such with steal valves I agree. However these motors are different. In the Yamaha service manual it says " This model uses titanium intake and exhaust valves. Do not use the valves used for lapping the valve seat. Always replace valves for lapping with new valves"... In a previous video I showed how a brand new head with brand new valves does not need any lapping at all to seal up and work well. From the factory these heads and valves are machined with such tight tolerances that they don't even lap them during assembly. If you lap a new titanium valve you will wear into the first layer of the valve that is needed for the valve to have a long life. Since a new valve will seal with a new head perfectly its not the new valve that needs correction in this case but the old head that may new correction for the new valve. The mild lapping done in this video using the old valve was just to clean up any imperfections of the used heads valve seat so the new valve can seat on it squarely again. I know it sounds strange and goes against conventional thought.
Doing piston ring s. changed cleaned all carbon With new oem piston Timing lined with outer marks arrow top dead center starts but red hot header and backfiring Any idea s will help I am top dead center on piston new cam with marks
Found the sensor unplugged. Unbelievable 😄
@@lawrencecorbo6586 Ahh hah! Good job finding it!
How do you like this bike vs yz 250
I like the YZ250f. But I also like the YZ250 smoker. If I could have the YZ250F frame and the YZ250 smokers motor I would say its perfect lol.
Hi @upallnight, maybe its on me, but why i never see you measure a cilinder? Or maybe ive never seen vids where you measure a cilinder. Is it not be able to measure every cilinder? Or can you explain? Learned a lot of things because of youre videos!!! Thanks 👍👌
Hello.Your welcome and thanks! With nickel plated cylinders Its easy to see if a cylinder is worn and needs to be replated or replaced without having to take a measurement. I actually have a few videos on these things that you might find interesting and helpful. Here are a few links...
Cylinders ua-cam.com/video/AoQ4_aqVjto/v-deo.htmlsi=4STePixqZhOs9Qa0
Pistons ua-cam.com/video/sAeSBuNQILY/v-deo.htmlsi=vtBH6lK4BnGKgxH4
Piston rings end gaps ua-cam.com/video/5wdMNpgAAYo/v-deo.htmlsi=BeO2gbibYTLE7IDC
Air filter looked dry AF
Oh yeah!!! Ding Ding Ding, thats what caused the issues.
Hi! Thanks for the great video. Manual says valve guide has to be changed as well when changing a valve, with all clearance work on top. How critical do you see this is really required? Also regarding the sealing, what is actually a measure of a good seal? In some videos (cars related) I see ppl do vacuum tests or leaving liquid for an hour and checking no single drop appears. In you example it is rather relaxed dripping test. As I have something in between (a slightly noticeable film of water building within a few minutes around contact surface), I try to understand if I can skip all this valve trueing hassle.
Hello. As long as the head doesnt have a ton of hours on it (like well over 200) and a valve hasnt contacted the piston then the valve guides will still be good to reuse with new valves. Honestly when it comes time to replace valve guides its almost better to just replace the whole head. The guides they sell are oversized and need machining of the head to get in the head. And then its gotta be straight in or it will also need the valve seat worked too. It better be a dam good machine shop (which is far and few between). Its better and almost cheaper to just buy a new head when that day comes. Anyway. You should be good to reuse your current head and valve guides. For the sealing, if yours is only getting a little wet after a while it will be good. It will have enough compression to start up and any imperfections that lapping would have corrected will happen on its own as the motor runs and the valve and seat get worked into each other. You should be good.
@@UpAllNight91 Thanks mate! Really appreciate your feedback. Let's see how she will run. Hopefully I would not need to comment under your another how-to change-crankshaft video:). Cheers from Switzerland.
@@samsled LoL. Right! But yeah I think you will be good. One think I should mention, if you are changing the valves and stuff because they made contact with the piston, be sure to check the rod very closely, they can get bent ever so slightly when that happens.
Lapping using old valves wouldnt that just shape the seat to the worn concave shape . ?? I lap my valves the same way as u but have been using good spare valve to lap in .
I imagine it would if I worked at it long enough. I try to only lap it long enough to get a seal again. Typically I don't have to lap them and I try to avoid doing it unless its absolutely needed which is rarely but it does happen. I do like your idea of using a new value for lapping only and then installing a new valve that wasn't used for the lapping though. Yamaha manual doesn't state to use a new or old valve, they only say not to lap the new valve that will be used.
I guess is the timing
Right on
I just got at least a couple of thousand dollars worth technical education just watching this video, not counting just save a couple of years of training to “see” what to check, in a bike with a failure.
Thanks a lot man!
@@robertovr9976 Your welcome! 😉
Hey man, do you know whats the diameter size on the valve shims? 9.48mm? I forgot lol
Hello. Both the YZ250f and the YZ450f use 9.48mm shims. (except for the older 5 valve YZ250'f's)
Hello i recently took my spark plug out on my yz250f 2016 & was wondering do i really need to use a torque wrench to screw it back in or is it fine to screw it in for now to see if the spark plug was the issue and in a few days use a torque wrench to get it perfectly screwed on?
Hello. Sure you can hand tighten it. It will be ok.
@@UpAllNight91 great thank you👍🏽
@@ammar9613 Yes sir!
If you are only replacing valves do you still need to remove cylinder and replace cylinder gasket or can you just pull the head and put new head casket on?
To change the valves you surely need to remove the head and install with a new head gasket.
Yes going to replace the head gasket but not going to remove the cylinder or piston, should I replace cylinder gasket or be ok since on taking off cylinder?
@@clayhinkle7664 Well yes its wise to change the cylinder base gasket when you remove the head. Which makes it even wiser to replace the piston because your removing the cylinder. For me if the heads coming off, I do the piston and base gasket as well. Sometimes the rings don't seat as well then the cylinder is removed and put back on a used piston and rings so this is why its best to just toss a new piston in while your in there. You could just buy new rings but keep in mind rings need to seal on not only the cylinder walls but also the piston. So a whole knew piston and rings is best
I would like to know if the 2019 has the same motor as a 2017 yz250f because I'm rebuild my top end
Very similar jobs for sure. Some different torque specs so make sure you have the manual for that. And little difference removing the air box but otherwise about the same.
Thank you for the information
@@calvinrasmussen08rasmussen66 Yes sir!
It's gonna be fucking hilarious when that guy takes that bike out and gets on it and destroys the whole top end because he didn't replace the timing chain...😅😅😅
Why do they have security screws on tp sensors?
The TPS adjustment is very sensitive and people would surely fool with them way sooner than ever needed when looking for running issues. It surely keeps the average guy out.
Wow bad idea not doing the timing chain. 19:44 😳
I agree. The good news is this timing chain doesn't show any stretch or wear so he may be ok but if it was my bike I would have surely done the chain too.
Hello bit ramdom I got 21 yzf 250 clutch is realy loud but the noise goes when u pull clutch in it goes
Hello. Its clutch chatter. These YZ's are known to be loud with clutch chatter even new. And its kinda hit and miss, one will be loud the other not so much. If it worries you it doesnt hurt to pull the clutch cover and check everything out. If all looks good, then just button it up and at least you know.
@UpAllNight91 ok thank u
@@UpAllNight91 I done that the plates looked fried hopefully it stops it
@@IvyWilson-vt3qf New plates can surely tame it down some.
@UpAllNight91 yea just order some il let u no how it goes
Hi, i have a 2019 yzf250 that will only start off a bump but will start fine off the electric start when hot. I done a compression test and was only getting 25 psi. Would this be the piston or worn valves as in your video? Thanks
Sounds like valves. Low comp but will start fine once its warm. That tells me its the valves. A quick way to check is to remove the valve cover and check the intake valve clearance.
I originally took it all apart as I assumed it was the piston but the piston looks like its recently been changed by the previous owner and the piston ring gap is measuring at 0.25mm which is in spec according to manual. I have checked the intake valve clearance and can't fit a feeler guage under at all so does that mean it is the valves at fault and piston is okay? Thanks
Yes sir. Will need new valves just like the bike in this video.
The video should walk you right through the job. Follow it step by step and you should be good
Thank you 😄 you've gained a sub
Is it normal for the very top corner edge of cylinder we’re you would notice detonation if it was there to get very slightly rough over time nothing bad but like slightly rounded and not as smooth?
No that is not normal. Sounds like its been detonating.
@@UpAllNight91 I’ll add u on Facebook can I send u pic?
@@UpAllNight91 from my understanding detonating is when the engine is running so hot that it constantly combusts so couldn’t it be from a to hot spark plug?
@@UpAllNight91 and what does a cold burn pattern look like and a hot burn paternc
@@user-ue3ku6qb3j Too hot or a hot spot or just too low of octane, or even just old gas. So many things can cause it. But it looks like octane is your issue. What octane are you using?
And dude if you got a problem saying locktight just say thread locking compound....duh!!!!
Hi buddy , a motorcycle with a kickstarter like honda 450 crf 2010, should we hear the fuel pump for 1 or 2 seconds or is it just motorcycles with electric starter? Thanks !
The kick start bikes are hard to hear the fuel.pump because they don't get much power while kicking. For them its best to just run 12 volts directly to them to test them
@@UpAllNight91 Thank you .
I have an issue with my CRF 450, I have a good spark, good valve clearance IN and EX , the fuel pump works but maybe not so well, I'm waiting for the pressure fuel tool but she's running... I have changed the fuel filter , clean the tank and she won't start since. T don't know what to do.
@UpAllNight91 Do you have an idea ? or Beavis may be ? 🤣
So she was running. You changed the filter and stuff and now she won't start?
Dude, you can't use the old valve to lap in a new valve.The faces aren't the same dummy.You have to use the new valve to lap it.
It doesn't matter when its a very small seat cleanup. I'm not doing it long enough to remove much of any material. Just a quick clean up. Got a question, do you ever have anything positive to say? Are you a negative Nancy?
8:00 CR-V means chrome vanadium?
Honestly dont know what it stand for.
@@UpAllNight91 im guessing its that. a lot of tools like spanners/wrenches are made from chrome vanadium steel
@@falcorcrow Thats true
@@UpAllNight91 thank you for the videos! most informative I've found so far
@@falcorcrow Ahh thanks!
Could be a worn tire?
LoL. Did you hear the bike run at the end. This one sounds sweet for some reason. Has a strong sharp bark when the throttle is blipped and runs so clean. Was 2020 different than the 22 and newer or something? Or maybe someones tossed a map in this one?
2021-2024 is the new higher revving motor. That one (2020) is said to have more bottom although they say the 21 plus still is class leading in bottom end...so it only gets worse
@@UpAllNight91
@@keithalexander36Yup, surely a smooth but snappy motor
I would almost guarantee you as gummed up.As that pressure relief valve was the carburetor is just as gummy and needs to be gone through...
This is a fuel injected bike.
Doctor doctor
😅👍
Why is it that any part that's being replaced on a motorcycle?In a UA-cam video they have to call it a bad boy that is so fucking weird.Everybody does that and it's annoying as shit.
On my 2021 you pull the high idle choke know out to turn it on and when you let off throttle it snaps back in and it’s back to normal
On this 2020 you push in the knob for the high idle choke. I verified this by also feeling the throttle as the button is pressed in, I can feel it also crack into the throttle a little as the button is pressed in. To release it, usually a quick blip undoes it like you mentioned however this bike I'm finding i have to give it like 1/4 throttle and then let go for it to undo the high idle choke. Probably just a little stiff from sitting i imagine but it does seem to be working if 1/4 throttle and then dropping the throttle
I have never seen a plug do that.😮 🏜👍
Edit: on valve seat checks i use a very, very thin coating i mean very thin coat of grease on the seat and pop the valve in and remove without turning it and you can see how the valve has seated. 🙂
Yeah crazy. Never seen that before much til maybe the last 5 years or so
When you adjust the valves you just take the valve cover off so why take the head off and replace the head gasket
Im sorry. I'm lost? I pulled this head because the valves needed to be replaced. Is that what you was talking about?
When you lose the excitement of an initial startup it's time to hang it up and move on. 🏜👍
Thats right sir! Thats right