KX125 '92 till '06 rebore to 144c????

[Imack]

It would take 4 mm more over the std bore (54 mm) to get a 125 to 144. Now the questions are:
Does anyone knows how much cylinder wall thickness is left after shaving 2mm off????
Will it affect engine temperature????
Have anyone in the forum done it????

 

[trial_07]

You want to do this yourself? I've heard it was a pretty tough job. Robwbright and probably others have 144s done by Eric Gorr.

 

[Pete Payne]

Yes I have done quit a few. I use Eric's pistons .
No they do not run hot as long as it is jetted right.
There is plenty of cylinder wall left , going to 144cc's(+4mm).

 

[Imack]

Heck yeahhhhhh

I have done it before in cars and motorcycles in my own shop.
I actually have chromed plated the cylinder instead of Nikasil. No complaints at all...Perhaps I need to start offering big bore kits at discount prices. The pistons are readily available from the 56 mm +2.00 overbore of pre-1994 125's. So a big bore kit must be worth not more than a piston kit, rebore and replate and some porting matching...!

You want to do this yourself? I've heard it was a pretty tough job. Robwbright and probably others have 144s done by Eric Gorr.