Displacement: 2.5 fl oz (65.8 cc); Bore diameter: 1.8 inches (45 mm); Stroke: 1.6 inches (41.4 mm); *Exhaust regulation models after September 99 cannot be used with normal mufflers. Please be sure to replace this scarf with a regulation muffler. About Piston KIT: From the STD size included with the bore up kit to the oversize piston kit for repairing in the event of baking.
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