Big Bore 01 CR125 Questions

[Jay-R]

I was wondering if anyone has a 2001 CR 125 with a big bore kit (133 or 144), who could tell me a little about the power characteristics compared to stock. Also, about which type of powerband it was ported for, reliability issues, jetting changes, etc.

Not that I feel that my stock power is holding me back, but it could always use a little more.:D

 

[Pete Payne]

on the 2000, 2001, and 2002 CR125 you can only overbore it to a max of 2mm over . The Exh port wall thickness and powervalve limit this. However ther is alot of potential for improvement in this cylinder. The 2mm overbore with proper port timing can tailor the power were you would want it.