139″ Milwaukee 8 Monster Big Bore Kit – Black

SKU: 201-613W


– Fits 2017- current 107″ Milwaukee 8 motorcycles

– Aerospace-grade all-aluminum cylinder with Nickel-Silicon-Carbide (NSC) electroplated bore

– No sleeving allows for larger bore sizes

– NSC-plated cylinders have less friction for increased horsepower, lower engine temperatures and a longer lifespan

Monster big bore kits will require case boring. Additional upgraded services recommended.

– Includes pair of all-aluminum NSC-coated bore cylinders, custom-forged pistons with high-tension rings specifically designed for NSC cylinders and a head/base gasket set

– Replacement gasket sets available separately

– Upgraded cylinder studs and head bolts recommended

– Made in the U.S.A.

2 in stock

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SKU: 201-613W Categories: , ,


Color/Finish: Black

Bore Size: 4.500″

Displacement: 139″

Stroke Length: 4 3/8″

Compression Ratio: 11.2:1 with 88 cc heads