Revolution Big Bore Monster Cylinder Kit 90" Cut Black Harley Sportster XL 91-20

Designer: Revolution Performance

Regular
$1,118.04
Sale
$1,118.04
Regular
Sold Out
Unit Price
per 
SKU RP201-411W
Free delivery to the Lower 48 States
30 Day Returns and Exchanges
Fitmet Questions? Call us at 610-754-8500
BRAND NEW

PART# RP201-411W

90" kit for 91-20 Sportster 3-7/8" bore 3-13/16" stroke 10.5:1cr (w/ 62cc flat-top heads); 9.8:1cr (w/ 95cc dished heads)

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

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 cylinders studs and head bolts recommended

Made in the U.S.A.

COLOR/FINISH BLACK / HIGHLIGHTED FINS
BORE SIZE 3.875"
DISPLACEMENT 90"
STROKE LENGTH 3-13/16"
COMPRESSION RATIO 10.5:1