01' yz426 piston replacement

3 replies to this topic
  • LPT1485

Posted September 13, 2007 - 04:36 AM


Allright, so I finally received my piston 13.5 to 1 wiseco in the mail.

Do you guys have any tips when replacing the piston? Ive done it on other bikes, but those were 2 strokes. It has the 03 cam mod, does this change the timing at all, and if so, can I just zip tie the chain to the cam to keep it in place?

Any help would be appreciated, or a link to a forum that has already gone over this.


  • Fastest1

Posted September 13, 2007 - 05:45 AM


No it doesnt change the timing. You wont be able to tie up the chain though. How would you remove the cylinder? Just mark the cam or reinstall it per the directions her on TT. That high of a comp ratio will require more octane than super unleaded has.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Birdy426

Posted September 13, 2007 - 08:16 PM


That high of a comp ratio will require more octane than super unleaded has.

Most of the time I get by fine on 91 Octane from the pump here in Cali...

  • creeker

Posted September 14, 2007 - 05:14 AM


I run 93 in mine and it works just fine.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  94 replies

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

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.