54MM HI_COMPRESSION RACING_PISTON (12:1) 13MM_PIN BIG CASES CRF50 CRF70 (S1109)
 
MOST LONG ROD ENGINES aka CDI MODELS, WILL NEED TO MODIFY THE DOME AND OR ADD SHIM PLATES TO THE BOTTOM OF THE CYLINDER BASE...
 
54MM HI_COMPRESSION RACING_PISTON (12:1/or_more) 13MM_PIN 
 
 TRX90_114CC IF SHIMMED A BIT (S1109)
 
 
54MM BORE PISTON KIT
 
13MM PISTON PIN
 
NOTE ! TRX90'S CANNOT USE THEIR STOCK HEAD'S WITH THIS PISTON KIT
 
NOTE ! YOU WILL NEED TO HAVE YOUR STOCK CASES ENLARGED FOR A 54MM CYLINDER
 
SEE THE PIC BELOW FOR ALL THE DIMENSIONS
 
THE HEADS WE SELL THAT WORK WITH THIS PISTON KIT ARE LISTED AT THE BOTTOM OF THIS PAGE, SCROLL DOWN PLEASE.
 
THIS CAN WORK ON TRX90'S THAT HAVE "BIG_DOME" OR "OLD_70_DOME" HEADS
 
HEADS FROM THE FOLLOWING WILL WORK GREAT: 
 
OUR OLD_STYLE ULTRA_HEAD WITH_RACE_CAM (OLD_70_DOME) 25MM_INTAKE 22MM_EXHAUST -SEE OUR PART S1425
 
OR
 
XR/CRF50/70 RACE HEADS WITH 22MM AND 25MM VALVES.
 
CT70_K0_TO_1977 
 
ATC70_ALL 
 
ALL_SL70 ALL_XL70 ALL_CL70 C70M_1970/71