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WILL WORK ON TRX90'S WITH STOCK OR MONSTER HEADS. 

WILL HAVE SLIGHTLY LOWER COMPRESSION ON THE TRX90'S, 

APPROXIMENTLY STOCK.

THIS PISTON MUST BE USED WITH THE STOCK 70 HEAD OR OUR MONSTER HEAD'S ONLY .. ALSO USE OF A LONG ROD STOCK CRANK (SEE INFO AT GO FAST SECTION)

54MM_PISTON_KIT (NEW_70_DOME) (LONG_ROD) (SHORT_CYLINDER) (100039) 100039$42.99