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Details
47.6 MM BORE
39.2MM STROKE
80mm Rod
10mm Wrist Pin
69.76 CC
13,400 MAX RPMS
21HP
10MM WRIST PIN
Direct bolt on no mods. needed Perfect big bore kit to water cool your Yamaha Zuma
POLINI HAS RELAESED THEIR THIRD GENERATION OF THE EVOLUTION LINE OF PRODUCTS FOR THE MOST POPULAR SCOOTERS. THE EVOLUTION CYLINDERS BENEFIT FROM A NEW TRANSFER PORT DESIGN IN WHICH THE PRESSURE IS EVENLY DISTRIBUTED ACROSS THREE PORTS INSTEAD OF ONE MAIN AND TWO SMALLER PORTS. THE CYL HEAD IS UNCHANGED FOR THE FACT THAT IT IS PERFECT ALREADY. FOR THE NEWEST TECHNOLOGY OUTFIT YOUR SCOOTER WITH THE COMPLETE EVOLUTION 3 COMING SOON TO SPI-PARTS.COM
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