Vehicle Fitment Information
Pistons & Top End
Koso 170cc Big Bore Kits & Parts for Honda Grom/Monkey
$26.95 - $607.95
Performance engine upgrade components including a 170cc Big Bore kit for Honda Grom and Monkey. The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts with a compression ratio of 11.5 to 1. An optional camshaft kit can be used with a stock engine but delivers improved results with Big Bore kits.
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