I'M IN THE PROCESS OF REBUILDING THE ENGINE ON A 87 TRX250R. FOR THOSE OF YOU WHO HAVE ONE THE 87 CAN BE BORED 80 OVER BUT IF YOU SWITCH TO AN 86 CYLINDER YOU CAN GO UP TO 140 OVER. THE ONE I'M DOING IS A 100 OVER. JUST THOUGHT YOU WOULD LIKE TO KNOW

RICK

 

HEY RICK, JUST WONDERING--WHAT PISTON DO U USE FOR THAT??SINGLE RING?? AND BRAND?? WEIGHT??
JUST THOUGHT I WOULD ASK.

 

I have an '87 250R. Luckily, the guy I bought it from already resleeved it. I got 3 or 4 more bores on it.