S&S CYCLE Cylinders - 4.125" - Black 910-0401 Tires Crankcases must be bored to

Crankcases must be bored to accept the larger 3-5/8" cylinders and stock flywheel assembly should be rebalanced

or to replace the cylinders and piston in an engine with an existing S&S stock bore stroker kit

Powder coat finish matches factory finish

Due to the inherent characteristics of gear drives

Built-in stinger cone directs air smoothly into the bore of the carburetor or EFI throttle body to reduce turbulence and increase flow

S&S CYCLE Cylinders - 4.125" - Black 910-0401 Tires Crankcases must be bored toCylinders 4. 125" Black Cylinders have a stock bolt pattern, Bored slightly under nominal size and are not honed, Designed for 124" Hot Set Up Kits used in '99 '17 Twin Cams, Wrinkle black finish with machined edges, Made in the U. S. A., Requires crankcase machining.