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Koso North America 4V Head Kit w/ 170cc Big Bore Kit
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Koso North America 4V Head Kit w/ 170cc Big Bore Kit
Ideal engine part to complete Kosos big bore kit.
Unique four-valve design increases air flow and performance.
Provides more power and torque.
Features a forged piston, stainless steel 24mm intake valves and 20mm exhaust valves.
Available Part Numbers
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