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THIS IS OUR STEEL 51MM CYLINDER AND OUR GK4 MADE IN JAPAN PISTON KIT. WITH TOP END GASKET SET. THIS IS A GREAT PRICE. THIS KIT WILL ONLY WORK BEST WITH THE STOCK HEAD.THIS KIT WILL WORK ON THE 1982 THRU 1999 Z50R'S WHICH ARE STILL USING THE ORIDGINAL CRANKS AND HEADS.
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