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54MM BORE PISTON KIT 13MM PISTON PIN NOTE ! TRX90'S CANNOT USE THEY'RE STOCK HEAD'S WITH THIS PISTON KIT NOTE ! YOU WILL NEED TO HAVE YOUR CASES DREMMELED FOR THE 54MM CYLINDER TO FIT. INSTRUCTIONS FOR INSTALLING THE 54MM CYLINDER = SEE LAST 4 PICTURES AT BOTTOM OF THIS PAGE

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 WORKS ON TRX90'S THAT HAVE "BIG_DOME" OR "OLD_70_DOME" HEADS

HEADS FROM THE FOLLOWING WILL WORK GREAT:

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


@ 114CC_CYLINDER_KIT 54MM_BORE HI_COMPRESSION BIG_BORE_TRX90 54-GBO/1-18/2-11

@ CLICK ON PICTURE ONCE THEN AGAIN FOR DIMENSIONS
@ CLICK ON PICTURE ONCE THEN AGAIN FOR DIMENSIONS


@ CLICK ON PICTURE ONCE THEN AGAIN
@ CLICK ON PICTURE ONCE THEN AGAIN


@ CLICK ON PICTURE ONCE THEN AGAIN
@ CLICK ON PICTURE ONCE THEN AGAIN


@ CLICK ON PICTURE ONCE THEN AGAIN
@ CLICK ON PICTURE ONCE THEN AGAIN


@ CLICK ON PICTURE ONCE THEN AGAIN
@ CLICK ON PICTURE ONCE THEN AGAIN


@ CLICK ON PICTURE ONCE THEN AGAIN
@ CLICK ON PICTURE ONCE THEN AGAIN


@ HEAD_DOME'S_? RODS_LONG/SHORT_? CYLINDER HEIGHT? WHICH_DO_I_HAVE_?
@ HEAD_DOME'S_? RODS_LONG/SHORT_? CYLINDER HEIGHT? WHICH_DO_I_HAVE_?


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@ THESE ARE THE AREA'S TO BE TRIMMED FOR THE 54MM CYLINDER


Click to enlarge
@ MUST REMOVE SOME ALUMINUM HERE FOR 54MM CYLINDER

@ (NOTE YOU DON'T HAVE TO SPLIT YOUR CASES THIS IS JUST FYI)


Click to enlarge
@ MAKE SURE TO SLIDE CYL. DOWN STUDS TO CHECK FOR CLEARANCE

@ (NOTE YOU DON'T HAVE TO SPLIT YOUR CASES THIS IS JUST FYI)


Click to enlarge
@ SLIDE BARE CYLINDER DOWN STUDS AND MAKE SURE ALL IS FLUSH


@ e BIG_BORE CASE_SET (50CC/70CC/TRX90) 58MM_OPENING CDI_TYPE_CASES (BBCS)
@ e BIG_BORE CASE_SET (50CC/70CC/TRX90) 58MM_OPENING CDI_TYPE_CASES (BBCS)

BBCS