Why Your TRX450R/ER or CRF Won't Start
Вставка
- Опубліковано 17 вер 2024
- This video I go into depth of why your CRF/TRX may not be starting. These bikes use Valves that are meant to be shimmed and they their valves seats are notorious for wearing out and making the Stem of the Valve sit up a lot higher then it's supposed to and in turn that will make the Valve hang open a tad bit. My suggestion would be to have the valves Replaced with some Fearra Stainless Steel Valves.
If you need any head work done and you need a very professinal bussiness to take care of you contact Racers Edge AZ for the best head work out there with great pricing.
Racers Edge AZ contact times are Monday - Friday 9:00AM to 5:00PM (Arizona time)
Racers Edge AZ Ask for John or Brett @ 520-631-0797 ://www.racersedgeaz.com/
Super helpful video! I reasembled the top end after doing new rings and valve steam seals (bike was smoking like a two-stroke) and it would not start and was shooting air out of the carb! after watching this I figured out I had mixed up the exhaust and intake shims . Thanks so much!
A lot of people also do not realize that these are high performance racing machines that need to be kept up on meticulously. Even with perfect maintenance they are not gonna last hundreds of hours. You might get 100-150 on the bottom end if you’re lucky and like 80 on the high side on a top end.
True kinda but also not true. For sure these are not anything like the 400EX and 300EX and 250EX and so on where those can basically have sand in the oil and still run for 20 years lol.
I have hundreds of hours on my bottom end that I rebuilt about roughly 4 years ago and I'm always floored and bouncing RPM's off the limiter 70% of the time that I ride and so far still good; although I HAVE went though a Couple sets of valves they will eat valves over a long period of time. Other why's as long as you keep up on the oil Changes Running good quality oil (or thicker oil in hotter climate like I do) I run and always have ran Rotella 15W-40 and change the oil after ery 10 to 20 hours of riding, manly that's keeping an eye on what your oil Filter looks like to ensure no metal in it. Sooner you see oil the quicker you can catch the problem before it becomes a much more bigger and expensive problem you're gonna be good for a long time.
i stretched an 04 to 102 hrs on the top end and god only knows how many on the bottom end. Ran perfect when i sold it.
Thanks this helped me a lot. I’m a car mechanic and about to fix my dirt bike. Figured I would watch a video before to get some knowledge and this is exactly what I wanted to see:)
Im so thankful i found this video, you explain it all so well
Thanks for watching!
Good work brotha!!
I ran across your tutorial on the 450 valve head...
I've been banging my head against the wall for weeks actually against the 00ex head that I was trying to port! I already took everybody's advice got a practice one to work with so I wouldn't ruin the only one I had... I know it was going to be tough ... Fuck nobody gives you information... You're seriously the first person that explained and showed what to do and how to do it,,,, granite it was on the 450R head which is totally different than the 400 but seeing
@@brandonnorton5307 Thank you and your welcome bud! It definitely takes some practice I Have ported many many 400EX heads as well. I'm glad this video helped you out.
I swear to God I keep hitting that button.... Anyway I read a lot of shit on porting heads and when you said it's not all about the airspace... bigger... wider isn't always better because of the Venturi effect(not because she told me so 😳)
I watched all your videos this morning... No It didn't take me that long...
Seriously I'm going to break this phone up bro I need you to be my mentor guru sponsor dad on this project?? Just the weekend warrior got a couple of toys and I'm too much of a tight ass to pay to get my head ported! Plus I enjoy working on bikes and learning new shit so let me know if you're taking applications
I was problem solving my CRF450X could'nt workout why it would'nt start, while kick starting i could hear the compression blow back into the carby, checked valve clearance and could not fit a 0.05mm feeler guage shim's were both 2.10mm i replaced both intake shim's with 1.90mm now i have 0.15mm clearance thank's heap's 👍
Glad to hear that I helped you out buddy! Thank you for watching!
Great job. Thank you!
My Honda Prelude engine that I have raced and is turbo has the original valves and some/all of them are starting to wear around the seat just like that, but not as exaggerated. It happens to steel valves in cars too but not as fast.
But you just keep lapping
@@HollywoodCod I'm not sure about the car engines but I know on Motorcycles you have to cut the seats. You cannot Lap Valves on atv valves and such
So I have an 05 Trx450r it’s turns on good cold but when it’s hot it’s a pain but I don’t really know anything about these quads I barley got it to put back the head lid or whatever is there a specific torque I need to tighten it too
This is why Honda loves these motors! Huge money makers in selling replacement parts and service.
Nothing t do with Honda. Yamaha and Suzuki same thing. They're just high revving motors they turn from 9000 to 120000RPMS things wear out faster then say an old air cooled 400ex and 300ex and 350 raptors and 700 raptos etc. Those bikes inly rev to about 700 to 8500 rpms. Plus if you think about it they really wouldn't be making much money anyways because 90% of the time when a valve job is due people go with Ferrea, Kibble Whites, Del West stainless steel etc.
@@trxtech3010 true, but they still make loads more $ on these compared to a traditional 4 stroke engine and thats exactly why the manufacturers like it. This isnt yours dads xr350r. And no not everyone goes aftermarket when it comes to rebuilds. Most the time Johnny just takes it to the local dealer and says "just fix it."
Does the 05 Trx450r have the same problem with the valves wearing down a little faster than the newer 450's?
rudycorraudio Yes, not as fast but the intake valves will wear out pretty wuickly.
@@trxtech3010 what should I look out for? We don't ride it that often or ride it really hard, we do maintenance regularly too. It been a good machine so far.
I have a quick "theory" question regarding the decompressor. What happens if it's adjusted a little to tight (not enough clearance) vs adjusted a little too loose (excessive clearance)?
It will back fire through the exhaust and sometimes won't even start or be really hard to start.
I have owned 2 trx 450er’s one 2007 and a 2008. Both I did a top end everything perfect on it. Re seated and sealed the valves not worn out and sharp like the ones you showed. The valve lashes in spec and so is timing. Only does 30psi on compression check but sounds like it wants to start and never does. Does not start pull starting either I’m tired of these quads I can’t figure out why they don’t start. I don’t know what to do now.
when you do a compression test on these bikes, they're always going to show low compression because of the decompressor is always letting some air out at TDC stroke.
Do you have any other tips that I can check? This engine is basically perfect it has everything it needs, like I said everything is in spec even the exhaust gets hot when cranking but never starts
is it not recommended to replace the titanium intake valves with steel? id be willing to sacrifice a bit of performance for longevity
didickcheeseburger I love the username lol. As for the valves... It is perfectly OK to replace them with steel valves matter if fact I wouod recomend going stainless steel. there's a brand out there called bronco that's actually very good too. One of best is Ferrea Stainless Steel Valves though, it is a very good and most commmon brand Valves to use in the TRX450R/ER Ferrea valves they actually give a small boost in performance due to the way the "bell" of the valve is shaped.
How would you adjust the decompression litter ? I’m having a problem with my trx 450er. Keep misfiring doesn’t want to start. New piston,cylinder,crank,cdi,stator,carb & etc. I’ve replaced pretty much everything and still doesn’t want to start. It keep’s misfiring. Do you have any idea what could be the problem?
Does it back fire as it's cranking and wont start? Sounds like a Metallic Clunk? If so As wierd as it sounds it's a bad Stator (Not starter I am talking about the "Alternator") which is really common on the 06 and newer. A lot of people think it's the decompression lifter or the starters reduction gear/one way Bearing... However its the stator (alternator) What happens is when they go bad they stop producing the proper voltage to the CDI box as cranking speed and it makes the CDI "Confused" and makes it fire spark slightly to early and causes it to advance or retard the ignition timing. The CDI box is a Programmed computer and with out proper voltage it will do that.
I am putting my money on the Stator "Alternator" is bad. They act up especially when warm, but when cold they will fire up relatively easily. When hot they back fire then makes a loud clunk, shoots flames out the exhaust when cranking, it will run "rich" due to the weak spark.
How do you’re fingers fit
Bend over and I'll show ya
Great video just one question. If I was to replace intake valves on mine because my shims are calling for 1.10mm what size shims do you put in with brand new valves ? It’s a 2012 TRX450r
Good question, so usually what you do from there is do what's called a "Blind Install", so when you get the new seats cut and new valves installed you have to install a relatively large shim (I usually start with a 2.00mm shim) and assemble the cam tower on TDC torque it down and measure my clearence. Example: (Say when you installed that 2.00mm Shim and you have no gap and cannot fit any feeler guage in there now try go to a 1.80mm or a 1.85mm) now say you have a .003" Gap with the 1.80mm Shim, now using a feeler guage then you need measure how large that gap is... Lets say you have a .003" gap now... Well now you need .003" more of a gap to equal .006" clearance, so that means you need a to go down to a 1.70mm shim. Sounds confusing but once you get the hang of it you can do it with out even thinking to hard on it just using feeler guages to measure the clearence and a verneer caliper to measure the shims if they're unmarked, and of course some reverse math involved. Basically just rememeber Shim size gives you the rocker to cam clearence, and on the intake valves the shims give you the Bucket to cam shaft clearence. I hope that makes sense! Maybe sometime I can do a video on that too.
Would be a good video and it makes perfect sense there’s basically no factory size it’s just based on how the valve seats. But thanks a lot I was going to try and shave down the shin but I’ll just go ahead and replace the intake valves
@@longlivejoey2337 Exactly. Also, shaving down shims is okay, but any smaller then a 1.20mm can cause the shim to shatter and drop a valve. I have seen that a couple of times.
Seems like you are always testing that motor apart.
Iseekoutthetruth I’m just hard on it lol. I should have replaced the valves when I had it apart last time.
Do you have a phone number? Or Facebook name I could get ahold of you by? I have an 08 450er that’s been to different mechanics and myself. I’ve got it tore down a little now and I’m stuck. The valves and timing have me stumped and I just need 10 minutes off someone’s time that knows what they are doing.
Wierd i swear i replied to this, anyways send me an email ryan94james@gmail.com Thanks.
Make sure you guys check out my channel and subscribe! ua-cam.com/channels/dOSLz34nxvxi2OBm9ewQOQ.html?view_as=subscriber
So I’ve replaced my valves with some Ferrera racing valves and installed a new clutch starter kit, my quad worked perfectly fine after that for about two days. The 3 day while riding it shut off at idle and didn’t want to start up anymore , my mechanic said it doesn’t have spark ? So I’m confused any suggestions what it might be
I did a push start and it turned on only once , when I tried the second time after shutting off it didn’t want to start anymore
@@AlexGonzalez-le6rp First before anything look over by the Carburetor and there will be a black connector (2pin connector) it's a throttle safety switch wire try jumping a wire accross those and see if it suddenly fires up.
Bro I’m having that issue with my bike, did you ever figure out what it was