How to Redo your Top End: Timing Chain Tensioner Installation and Leak Down Test - Part 3
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- เผยแพร่เมื่อ 8 ก.ย. 2024
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I figure out my issue with the resistance when turning over the engine and demonstrate the proper way to install a timing chain tensioner on this quad. Boy was I doing it incorrectly...
The PSI in the cylinder is higher now but not great. I discover another issue while doing a leak down test that spurs the next chapter in this rebuild. Note to self... Always do a leak down test first when troubleshooting low compression. It would have saved me some time.
The specific ATV I am working on is a 1988 Yamaha Moto 4 YFM225.
Let the learning and rebuild continue.
My OTC leak down tester - amzn.to/35M39MB (This thing works great and is worth the few bucks for what it saves in troubleshooting and focusing your repair efforts.)
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You were lucky you didn't break a bolt cinching the tensioner in. My kid did that just today...Tomorrow I am gonna try and extract the broken bolt. Good tip on the tensioner reset - very few top end overhaul videos talk about this.
Thank you for the post took me all day trying to get my 89 moto 4 250 to run after rebuild and all it was, was that damn tensier never knew that til now was about to give up and figured id try that thank you so much starts on a dime and runs like a dream now subscribed my man
Took me a day to figure it out the first time too. Thanks for the sub.
I think you just saved my bacon dawg. Thank you
Open throttle when compression testing.
For TDC on my XT200, crank turns twice to cam sproket once. I had to skip a cam rotation and get the crank caught up to TDC. To confirm I removed the sparkplug and put a straw down in to measure depth of piston for future reference. Now to shuffle the chain. First disengage the chain tensioner to relax the chain. Then disconnect the cam sprocket to rest on the bolt threads, rotate the crank with a 17 mm socket through the case access at magneto to TDC in the smaller peep hole. Then brush the chain across the top of the sprocket with a small round screwdriver shank without dropping the chain into cavity. May take a couple tries to get the correct link to TDC mark on sprocket. Then secure the cam sprocket. Reset your chain tensioner. Confirm the piston is at TDC by checking straw through the sparkplug hole. Stay warm
It's hard to go slow and think when you are numb from the cold.
Haha, my Bear is 66 lbs, with 2 spoonful oil in spark hole, 180 lbs on tester, boy, my valves seal good, now just need to renew top end.
Man this really helped my butt
Thank you
You need to pull the covers off the valve adjusting port where the rockets are and make sure both are free moving with no tension to be at tdc of compression stroke....otherwise one or both valve with be open...
I got a 85 yfm200 its making a rattling knocking type noise off idle but stops once it gets off idle could it be timing chain? I'm sure it's not rod knock because it doesn't get louder with rpm ....could it possibly be centrifugal clutch noise I'm new to yamaha I've always had Hondas
My first guess would be timing chain slapping the case. One of my moto4's does it and having done a few other quads now I'm betting if I crack into it that will be it.
Also do you know where I could get an exhaust for one of these four wheelers
Dg performance makes them
You should check your chain guides now, you probably took some life off of them
Hello, been watching your tech for a while. TksQuestion: It will not start: with wrong oil filter - it poured out oil from gasket. I replace w/factory , filled oil and it will not start???2003 650 Prairie , 200 hrs. It sparks, trys to start one cylinder when gas in carb, No noises, a compression check w/ weak battery measured 35psi ft & 45psi rear.Suspect front chain tensioner?? if front, any special way install or check or can just R&R.
Please let me know thoughts, any ideas
Tks, mark / georgetown ca.530-333-5986
Hi Mark, I can’t say I have any experience with the prairie but the 35 and 45 psi compression sounds really low. I’d check the spec in a manual or forum. I might suggest looking to see if there is a Facebook group for the Prairie’s that could give you better specifics but certainly check that compression spec. Good luck!
I will not watch your video too much wasted time talking about other things instead of the ATV
He sure helped me
That's awful mean Teddy