need help with wiseco piston install


5 replies to this topic
  • 2000yzf426

Posted May 08, 2005 - 06:08 PM

#1

I've spent most of the day rebuilding my 426 after getting it back in pieces from a theft recovery. Needless to say its been quite the experience figuring what goes where and now I'm trying to install the wiseco hi-comp piston with a three piece oil ring and I'm not having any luck getting the damn thing in, the middle ring keeps poping out and to me it looks like the 2 outer rings are supposed to hold it in. If anyone has some pointers that would be great.
Thanks

  • FFRacing79

Posted May 08, 2005 - 07:27 PM

#2

The easiest way to install the piston is to do it on the bench...then with the piston and cylinder together, install on the motor. Tdub

  • grayracer513

Posted May 08, 2005 - 07:30 PM

#3

They are supposed to "hold it in", as you say. At least, they are supposed to sit on the little ledges of the expander (the middle ring). The ends of the expander are also supposed to be butted. The truth of the matter is that the expander is supposed to hold the rails (the upper and lower rings) out. A ring compressor is an invaluable help with this. See if you can borrow or rent one.

Triplex rings are hard to work with otherwise, and although it is possible to assemble them without a compressor, it's also very easy to damage the ring doing it that way.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • FFRacing79

Posted May 08, 2005 - 07:32 PM

#4

GR, try it my way if you haven't already...it is so much easier. Tdub

  • grayracer513

Posted May 09, 2005 - 06:35 AM

#5

Tryce,

I do that when possible, but not all of the YZF cylinders are cut out on the sides, and the oil ring is so close to the wrist pin that by the time the piston's low enough to put a pin it, the rings are back out. I figured his '00 model would be like that.

When I do them on the bench, I use a compressor and put the piston in from the top.

  • 2000yzf426

Posted May 09, 2005 - 04:50 PM

#6

Thanks for the info, tomorrow my buddy is bringing his compressor in to work so i should be able to get it done with that.





Related Content

Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

Should I buy this bike? help....... by Numsa Hul


Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies
Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.