131″ Twin Cam Monster Big Bore Kit – Black Highlight

From: Revolution Performance
SKU: 201-129W


– Fits 1999-2017  Twin Cam motorcycles with 4 5/8 stroke and 7.669″ rods
– 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 SNC 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.

Backorders available.

This service may not be compatible with your vehicle. Return to shop and add your vehicle details to show compatible products and services.

SKU: 201-129W Categories: , ,


Color/Finish: Black with Highlighted Fins
Bore Size: 4.250″
Displacement: 131″
Stroke Length: 4 5/8″
Compression Ratio: 11.2:1 with stock heads (86 cc) and 10.6:1 with Revolution Performance Stage 3 CNC head work (95 cc)