YZ426F Project Part 3 - Oh Ye Of Little Compression

Update on my yamaha yz426 project. This bike was purchased not running, and I dive in trying to figure it out.

[@brandonquenneville7330]

Simply amazing this guy. Just smart, really smart. So much to learn from this video people

[@YzBlue777]

I could watch these videos all day

[@rideout_ryan]

same man i could binge what this all day long instead of homework

[@sufianalfutaih3952]

Really like the videos ! This last one just motivated me to what I've got to do on my old xr 600 - havn't kick started it in 12 years , and the engine is locked . Daily use is 99 CB599 , really smooth shifting , quick when needed / some times H.D. Sportster , but most fun and true biking is always the dirt bike . Damn missing it to ! Going to start working on it right now thanks to this guy . 💪

[@heathwak3030]

How did it go

[@jenniesgarage]

I'm glad you enjoyed the videos, thanks!

[@igeorgiev1984]

You make it all look too easy! Love your work! Got the same WR426, it used to idle like a 90 YO smoker and it now barely starts. I'll strip the whole engine off, starting with the carburetor and hopefully I'll find my problem. Good luck!

[@jenniesgarage]

Happy to hear you enjoyed it, thanks!

[@hicanihaveamediumcheesebur4824]

I watched this video two times it taught me a lot and got my bike going thanks man! Great video

[@zx8401ztv]

Well done for last year, you got the bike going and thats bloody brilliant :-)). I think your logic and methods are fine, it works, it has good compression and you can allways fiddle about with the settings to get optimum. Too many negative people in the world, ignore them!!

[@realvintagemoto]

Great video! tip: when loosening your cam caps do it in a criss cross pattern in stages like you would to torque them down.

[@timtravasos2742]

Runs good. Great explanation of valve adjustment. I've never seen that done before. Good luck.

[@BigDeWitt88]

I am convinced that if he started a cooking show and you gave him some salt and a cup of flour... the end result would be a 16 ounce t bone steak.

[@mAdAsZaC]

10:00 stop, make sure the last intake lobe is facing up :) judging by the video you did not look.. Btw these arnt old cars i know your trying to save money but for a bike you just bought with unknown hours i would take the head off and inspect valve wear and the piston and bore etc.. (may work out better in the long run) Love these videos and have watched all of the wr series id like to make videos like this

[@jac_attack04_59]

Awesome man! I can work on bikes but I have a lot more to learn. Love the videos, keep up the amazing content, thanks for teaching me everything!

[@benjaminengle9085]

Just by seeing you open the cover i could tell the cam's are off sync at TDC the cam circle's on the back side should be facing opposite side equally

[@NoWinIntended]

Benjamin Engle not always

[@kerrygillenwater5113]

I could tell it was out of time when he took cover off

[@cameronhicks5225]

Love watching these videos, thanks for the awesome rebuild vids!!

[@frassonracing]

The 426's had such a beautiful unique sound to them😍

[@ThugyC1245]

FrassonRacing sounds like a beast

[@sammazzini4112]

Thankyou so much for this video, i have had the exact same problem with an 84 xr500 but now i am confident i can fix it.

[@KGrasso89]

I don't understand why these newer bikes have valves that need shims. Why not use an adjustable valve with a locknut like on older Suzuki DRs?

[@Ironsights85]

more moving parts and more weight higher up on the bike, not a big deal for a trail bike, but every ounce counts on a race bike

[@Floppauuugh]

This is bucket and shim not rocker arm. That's why. Bucket and shim suffer from less float, harmonics etc.. I know these comments are over a year old on a 6 year old video...

[@KGrasso89]

Makes sense to me! Thanks

[@BigDeWitt88]

Been watching this fella for a couple of days now and here are my findings... if you gave the man a retired NASA rocket ship that no longer ran, in two weeks it would be on the moon. Just saying.... keep on keepin on brother.

[@faster592]

are you still doing videos as of 10-13-2018

[@anthonyward969]

ik this is old but u cant chech the clearances unless ut TDC or u wont get an acurate reading

[@88Don]

I respectfully understood your purpose and reason for getting those bikes I bought one myself for 700 I’m rebuilding the top in now

[@chrismorrison9304]

To check your valve clearance, your engine has to be at top dead center, and there is a specific amount of clearance that is suppose to be between the cam and the cam bucket

[@Saundersstrong]

wow ! great videos man i realy enjoy watchin them ! its cool how you had the guts to take her all apart and find out what the issues were , good for you Braap

[@jyaj916]

Great video I love to see something not running turn into something that runs

[@LetUsRepair]

Really great video. I like how you explain everything in detail, but still it's not too much talking - not enough action. Looking forward to seeing videos of this bike tearing up dirt!

[@spencerleonard2617]

The tensioner will lock if you turn it all the way in- makes installation easier

[@Nelis1992]

i like the way you work on the bike. you use plain logic, your sence and reason. though i would have used a torque wrench for the cam caps.

[@shogun678]

I know this video is old but for anyone reading this, make sure your engine is a top dead center before checking valve clearance.

[@frassonracing]

I am a novice 16 year old mechanic, I can rebuild top ends in smokers by myself, and I'm trying to learn some stuff so...: could it have that low of compression because of a stuck open valve?

[@jenniesgarage]

+FrassonRacing Keep watching the series you may be on to something :)

[@yzfnation4267]

FrassonRacing yea dude your right but stuck open valve isnt really the right terminology, there's supposed to be a small space between the lobes and buckets, as the space becomes thinner and thinner the cam without the lobe facing down pushing the bucket open will open the the valve ever so slightly causing the compression to escape through the little space between the valve and the head

[@jonahpower1059]

This might explain the problem with my 02' WR426f. I put new piston rings and head gaskets along with a timing chain, because when I started it one day it blew out black and bluish smoke so I shut it down and never started again. After I rebuilt it she still has no comp. Going to resleeve the cylinder and put a new piston in it but if that's the case then I wasted my money lmao

[@trailblazer8380]

Moto . Kid sounds like a timing problem, that's why I love 2 strokes 😂

[@manowar99]

Awesome video! Very informative. And good camera angles so we can actually SEE what you're doing and talking about, which is not something we often get in engine work KZbin videos.

[@jenniesgarage]

Interesting, I'll look into that. Thanks!

[@markreagan2956]

You need to be at top dead center there should be 2 plastic screws on the side of one of your side covers where you put it at top dead center, the bottom one has a bolt for a socket, and the top one shows your flywheel and your stator, there is 1 mark on the flywheel and 1 mark on the stator, align those up and your at top dead center, never mess with valve adjustments or try and get your cams in time without making sure your piston is at top dead center!!!!!! Very very very important!!!!

[@wuya31100]

Oh my god thank you! I just got a 01 426f and had the same problem! I have the carb apart right now and after that doing this! Thank you so much!

[@notorious6198]

The bike needs to be at tdc (top dead center) and keep the cam covers tight get the right shims and adjust them.

[@cwatson42785]

He did

[@pittbier7597]

maybe you should finish the video

[@rodrigoperez47]

I know this is 7 years ago, but I have a 2002 yamaha yz426f that I tried bump starting it after I couldn’t get it to start even after I did the whole procedure. And now I have really low compression to the point where I can move my kick start all the way with my hand. I used the decompression lever while I dumped the clutch and I thing I might’ve holded it too long. Now the decompression lever won’t engage, the handle is really stiff.

[@rodrigoperez47]

Great video by the way @jennies garage

[@troyparks5839]

I have a yz426f 2001 Im trying to rebuild after it was stole from me dont knkw if its even worth it they had it 6 mths without changing the oil or nothing for that matter. So one thing Im confused about is the header pipe gos right into the engine theres no coupler that comes out. Not sure of the name of the part but I see it on all these bikes and mine dont have one. Never worked on 4 stroke bikes so just learning. Thats for putting out these videos they help alot. Just dont know if I should sell as is or sink more money? I have a 2018 rmz450 just wanted to do work on that before my 2018 needs work.

[@espanosamatthews5919]

Thanks I needed this I got the same bike with the same issue and I think this video is going to help me a lot

[@yamahafan7330]

Once again you need a rag underneath so it catches parts in case they drop. I really enjoy your videos though, keep them coming.

[@rustworld2404]

I believe the hot cam shims are for auto decompression sir, just saying might be why it did not lock up at top dead center.

[@SteveHacker]

This guy points to a lot of invisible links in his videos. LOLOL!!! 😜😜😜😂😂😂 ... Just messing with ya though man. Love your videos. 😊😊😊

[@caswellracing7626]

Should've put the engine out of the bike with no title into the bike with the title

[@NoWinIntended]

You could but on the title there is a vin number that matches to the frame and to the engine. It would work but it would be sketchy when you sell it.

[@itsyehboii1758]

Same engine dumbass

[@henripuustinen4642]

You have both a frame- and an engine number - all specific to one bike.

[@dillonbmx16]

@@itsyehboii1758 two different bikes tho

[@dillonbmx16]

@@henripuustinen4642 use the good engine for parts

[@badboyjose71]

Hey no matter what anybody says I like your videos keeping coming bro

[@Peterrides]

At the part 22:41 why didnt you just take the 1.85mm shim from the bad intake and trade with the right side exhaust shim? looks like it wouldve work perfectly.

[@austinm2305]

for the future, you should look into getting vermont registration for bikes with no title, its a well documented, proven loophole, which is a fairly easy process to getting a title and registration, many forums cover the process which is basically the same as applying for a new title. easy.

[@kingbanks87]

you're a beast dude... great videos . keep em coming

[@josephcostellorockss]

Swap the motor?

[@brandonquenneville7330]

Guy your a dream come true for us home boys. Country boy from ontario here. Amd you friend have turned me into a half ass mechanic. I want to pay you! And i will soon when my paypal is back inline

[@jenniesgarage]

+Brandon Quenneville haha thanks! No need to pay me, I'm just glad you like the videos.

[@bennettxr100]

It looks like the cam was off a couple of chain links, from the other videos ive seen they line up differently

[@kimbletrainer6058]

My 99 yz400f, valve cover gasket is leaking and one side is tighter than.the other and so it leaks out the side thats loose and not the tight side any ideas what could cause that please

[@moegreenbl]

You have to put the engine in time to check the Valve gap

[@kentuckykid90]

sounds like the bikes running lean which is bad for the motor i could tell when you hit the throttle it returns to idle slower than it should..... this is also called a lean drop and isnt detrimental but should be adressed in the future

[@greymarket6834]

i cant believe it took so long for me to find your channel

[@yamilandole8343]

Buenas, se le puede adaptar el cilindro de la 450 a la Yz 426f?

[@johndugan1488]

love the vids. i got an '02 yz426 project that could be the identical twin of yours. valve lash, dirty carb, oil leak in clutch cover, and mixing oil. anyways, quick question. (rebuilt the carb and replaced accelerator pump so far) waiting on parts right now so i been shining the junk out of it. keep us posted on yours, maybe i can get a vid up of mine as well. peace.

[@electronthebig2907]

great upload, detailed,informative,educational and witty.(well half way there in the right direction for the wit dept;.....most of all enjoyable and interesting,,

[@Daniel96sj]

Hope the project goes well

[@Ironsights85]

id forgotten how ridiculously loud these old bikes were, i had a 99 yz400f back in the day that sounded pretty much the same

[@MrCanchay]

man i really wish you did some projects like these with a naked 600cc or super sports bike!

[@eddieledesma4446]

i have a 2002 yz450 ,i have a question my fly wheel does not have a mark for the tdc,its just round and smooth,,,help

[@wyattcarey8689]

U have It fixed yet? If not respond and I can try to help u

[@0611930024838]

"good enough... for this old boy."

[@alfonsogomezpavon9515]

Hola mi moto es una yamaha wr 426f, la moto en caliente tiene compresión pero en frío no tiene compresión, a que puede ser devido?

[@ALIVE8455]

no thats a decompression lever, the odler yz 4 strokes had a decompression lever. around 03 and newer they switched to auto decompression and a hot start

[@clifc6351]

Smart Man! Jennie's got a Winner!

[@GodfatherMaxi]

Dud can do a video with sound of the engine .I got one 2000 model and i put new piston ring and chain and make a little noise ...

[@jenniesgarage]

Check the final video, lots of good engine sounds there :)

[@brodyhays3599]

I had an 80cc Honda four stroke that had so low compression I could (and have) start it with my hand.

[@JETZcorp]

That might just be because it's so small. I can start my 120cc 2-stroke with my hand and it has very good compression. I was even able to hand-kickstart my 400 triple 2-stroke because the kickstarter is very good.

[@jacksonms212]

the 1.55's and the 1.65 are intake the 1.85's are ext. could be the two .55 are wearing because of the middle being to high causing a see/saw effect wearing the two outside more ??? lol Jake don't get me lying on this one brh don't have my hands on it ... oh crap just looked at the date of the video ???

[@wasabiemans]

Shawn Jackson lmao

[@lookersd]

haha nice job with the bike mate slowly but surely getting there

[@tonypanda121892]

what kind of exhaust is on that i might be picking a yfz426 for 1000 and like how that exhaust sounds

[@Claudiu_Dumitru]

Old video, I know but still great to watch. Those "buckets" are tappets :)) . Btw, sub'ed

[@garrettgreene9207]

If a bike is sitting for a long time and it has low compression if you rid it around for a while it will get more and more compression

[@YZNUP]

I had a bike the same easy to work on, mine did 400 hours on same piston and still was going hard

[@steffy597]

Why are you reinventing the wheel? You're not even at TDC, when you are the cam lobes should both face out with the cam marks level with the head. Free .PDF manuals are all over the place. Go get one.

[@cg3850]

How do you find bikes like this i love fixing them and want to do a project like this.

[@jenniesgarage]

+C G craigslist every day, there's deals out there.

[@MrAnjosam]

Good job on improvisation man! you are like me, we spend less money than Tarzan.

[@jenniesgarage]

haha you got that right, and I think he dresses better than me too!

[@markreagan2956]

My bad I misspoke there’s a hashmark on the side cover and you align that up with your flywheel 😂😂😂, recheck your valves while your motorcycle is at top dead center lol

[@peterblake287]

Your timing is out lobes at 10 and 2 at tdc

[@mohammadsulemanbung5332]

have you any dt 100 or dt 175 yamaha please load video

[@InverseHierarchy]

great series thank you for making these

[@MLGtroll365]

after you fix it. do the cam mod. bike will become a beast. its when it move the cam chain back one tooth

[@WS6xMASTER]

Very Very nice find. very lucky.

[@jenniesgarage]

+TheGamerGuy Yeah, it was a good machine.

[@GaryLordsWayMinistry]

Sounds to me that you have another dirt bike that will run and give you years of fun and maybe even make you some money some day.

[@jninefive.6495]

Missing bolts just means it was reassembled BETTER than OEM!

[@yorunaito3216]

i need one. im having so much trouble with my bike at the moment

[@libertyforamericanow]

shoulda put a timing chain on it. would start one kick then. timing gets off as t stretches.

[@TheMonsterfisher]

Sounds sick as man! Good luck with it!

[@Peterrides]

You should switch the engine from the 01 into this bike and you can register it like that.

[@cdh79]

my motto in life: "bad idea? maybe, but that's ok" :D

[@rama6maiden]

Great videos man keep it up!!

[@motorcrosskid90]

its 2001 the engine has been took apart before so you never know and that lever is a hot start lever not a decompression lever

[@AJYZF1R2010]

Love your videos my friend fantastic

[@jenniesgarage]

Thanks so much!

[@Tater4200]

did you have it on tdc when checking the clearance?

[@wheelieaddict8677]

no he did not which is why he had all that clearance...smh. And to think allllll these people think this guy is GOD is beyond me. He's good. But he aint that good.

[@wuya31100]

How did you know that the tensioner was upside down?

[@jenniesgarage]

It felt like it wasn't going in right. Almost like the holes weren't lined up.

[@TheEscape2012]

i dont know if you got the thing with the feeler gauge right. You would need at least 3 feeler gauges to find the right clearance wouldnt you?

[@mistdg]

WOW!!! $600... golly. What did you do with the other one?

[@jenniesgarage]

The neighbor kid had a suzuki rm400 that blew up, so I sold the kx cheap to him.

[@nathanbrinker1149]

Ik its old but sounds like a zero clearence valve so you need a new valve

[@GCPM001]

Can you just swap engine from the 2001 model?

[@yzfnation4267]

Dan Theriault my bike isnt a fully 2002 yz426f, from the crank up its 2001, 01' crank, piston, cylinder, cylinder head, and valves, yes it can be done yes i was desperate to do it to get my bike to run again after blowin it up haha

[@BULLOCK1973]

Hot cams shim kit on eBay, buy sizes you need or kit. Cheap stuff

[@GregMcAskill]

really like your videos man.

[@enternameheree]

Just use a magnet to get your buckets and shims out. Then you dont have to use pliers.