109″ Evolution Big Twin Monster Big Bore Kit – Natural

SKU: 201-215W


– Fits 1984-2000 Evolution Big Twin Motorcycles with 4 5/8″ crankshaft

– 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: 201-215W Categories: , ,


Color/Finish: Natural

Bore Size: 3 7/8″

Displacement: 109″

Stroke Length: 4 5/8″

Compression Ratio: 10.5:1 with stock heads (86 cc)

Piston: -2.15 cc Flat-Top