2000 cylinder on a 1995 yz 125

smrmx

Member
Nov 18, 2001
36
0
I just bought a yz 125 that has a 2000 cylinder on it with a 1995 piston in it. My problem is I can't get this thing to start.It has good compression,spark ,fuel, and looks like proper timing.It acts like its going to hit and start but will not.
Eric or Rich I know you guys are the best.Do I have to run a newer piston with boost port to run with the 1038 bearing ?


I am lost on this thing please help

Thanks
 

CRazy250

Member
May 28, 2006
334
1
i think the piston is the problem, i believe the 2000 piston has an intake window and the 95 piston does not
 

Eric Gorr

Engine Builder
Jun 29, 1999
384
12
The piston window won't hinder the starting unless the piston is backwards. The rectangular window should face the intake side of the cylinder.