Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Need expert cylinder identification/advice!
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="tgutzmer, post: 1372215, member: 113113"] Ok, long story short. The 02 YZ125 i recently purchased in a box has some issues. I put it back together and everything seemed fine - until i ran it. Has no bottom end response and erratic idle. It was initially running very lean with a 430 main. Went through the engine (air leaks) and carb with a fine tooth comb - no fault found. I did have to go up to a 460 main jet to get the plug a nice brown color. Jetting didn't help with response/power. The conclusion that i came to is that i have a mis-matched cylinder and/or piston (port timing) to the bottom end. I did some pictoral research online and i now believe i have a 98-01 bottom end style based on the intake manifold design (also takes a larger diameter wrist pin bearing). I would have to assume my cylinder and head are factory 2002. I have confirmed that i have a 03-04 piston (is a smooth round piston without charge ports on the sides). Does anyone know which combination of cylinder/piston can be ran on this? OR better yet is there any way of positively identifying the year of the cylinder/head? [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Need expert cylinder identification/advice!
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom