Cylinders & Pistons

168 products

Shop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.

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$476.99

Cylinder Studs: Features & Benefits:- * 4140 Chrome Moly studs, oil quenched and tempered to 39-44 HRC * 180,000psi Tensile Strength * Rounded thread roots, rather than flat, improving fatigu...

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KB PISTONS

$465.99

* Bore=3.498″ – Stroke=3.812 * Hypereutectic Alloy is a cast 16% silicon content material * Perfect for air cooled engines * Low thermal expansion rate = tighter piston-to-cylinder clearance Tech ...

KB PISTONS

$464.99

Features & Benefits:- * Bore = 3.518″ * Stroke = 3.812″ * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter p...

KB PISTONS

$464.99

Features & Benefits:- * Bore = 3.508″ * Stroke = 3.812″ * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter p...

FEULING

$277.99

* The strongest studs available! * Top engine builders demand quality fasteners! Secure your engine with complete confidence * Superior in strength and performance to any other cylinder stud kit o...

$262.99

Features & Benefits:- * Crafted from strong, billet 6061 T6 aluminum * Patent Pending Dual Spray Technology for uniform piston cooling * Revised spray locations for more effective cooling * An...

COLONY MACHINE

$259.99

Features & Benefits:- * Custom Look. * Polished & Chrome Plated, 12 Point Dome Top Headbolts. * Replaces OEM 16480-92 and OEM 16478-85A Tech Tips:- * Will Not Fit M8 Engine’s. Proudly Mad...

COLONY MACHINE

$257.99

Features & Benefits:- * High Tensile Aircraft Quality Studs. Proudly Made in the USA by Colony Machine ! MFR PART No: 2442-8 ROLLIES PART No: CM-2442-8

COLONY MACHINE

$200.99

* Set of 8 * Replaces OEM # 16837-85 MFR PART No: 9424-8 ROLLIES PART No: CM-9424-8

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$217.99

Features & Benefits:- * Sold as a Pair. Tech Tips:- * The SS940-0014 are the thin rings that S&S are using now. Proudly Made in the USA by S&S Cycle ! MFR PART No: 940-0014 ROLLIES P...

$5,156.99

Features & Benefits:- * 80ci with High Compression. * 4-1/4″ Stroke. * 3-1/2″ Bore. * 5.330″ Cylinder Length. * 9.0:1 Compression. * Includes Cylinders, Piston Kit, Head Bolts, Base Nuts &...

$5,045.99

Features & Benefits:- * 74ci with High Compression. * 3-31/32″ Stroke. * 3-7/16″ Bore. * 5.330″ Cylinder Length. * 9.0:1 Compression * Includes Cylinders, Piston Kit, Head Bolts, Base Nuts &am...

136ci Stroker Big Bore Kit with Highlighted Fins – Black. Fits Milwaukee-Eight 2017up with S&S 4-5/8in. Stroker Flywheel.

$3,562.99

S&S has been building big bore kits since the 60s and has it down to an absolute science. Our latest efforts are aimed at the Milwaukee Eight® platform and open up a whole new level of perform...

136ci Stroker Big Bore Kit with Non-Highlighted Fins – Black. Fits Milwaukee-Eight 2017up with S&S 4-5/8in. Stroker Flywheel.

$3,562.99

S&S has been building big bore kits since the 60s and has it down to an absolute science. Our latest efforts are aimed at the Milwaukee Eight® platform and open up a whole new level of perform...

132ci Big Bore Kit with Highlighted Fins – Black Granite. Fits CVO Milwaukee-Eight 2017up with 117ci Engine.

$3,494.99

Features & Benefits:- * Upgrades Milwaukee-Eight 117ci CVO models to 132ci * 4.320″ Bore * 4.500″ Stroke (4-1/2″) * Forged Pistons. * 11.1 Compression Ratio. * Black Granite Finish With Highl...