Cylinders & Pistons

160 products

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

$1,255.99

Features & Benefits:- * The ring pack has been moved down 0.080″ to prevent the breakage issues the Stock HD cast pistons are having. * Bore = 4.085″ * Stroke = 4.625″ * Fully CNC machined * ...

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DAYTONA JAPAN

$1,111.99

Features & Benefits:- * 4.250″ Bore * Black with CNC Machined Fins * Includes Dowel Pins (Does NOT include Pistons) * Replaces OEM # 16800075 or 16800095 Suggested Additional Purchase: 1.a) To...

KB PISTONS

$829.99

Features & Benefits:- * Bore=3.875″ * Stroke=4.000″ * Hypereutectic Alloy is a cast 16% silicon content material * Perfect for air cooled engines * Low thermal expansion rate = tighter piston...

KB PISTONS

$829.99

Features & Benefits:- * Bore = 3.885″ * Stroke = 4.000″ * Hypereutectic Alloy is a cast 16% silicon content material * Perfect for air cooled engines. * Low thermal expansion rate = tighter pi...

$1,242.99

Features & Benefits:- * Use with performance exhaust, air cleaner, S&S 585 bolt-in cams & EFI tune to produce massive horsepower gains. Tech Tips:- * Will Not Fit Twin Cooled Models. ...

CP CARRILLO PISTONS

$841.99

Features & Benefits:- * ID # 2621 * Bore = 3.937″ * Stroke = 2.835″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed f...

CP CARRILLO PISTONS

$1,065.99

Features & Benefits:- * ID # 6932 * Bore = 3.937″ * Stroke = 4.375″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed ...

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KB PISTONS

$730.99

Features & Benefits:- * Bore = 3.238″ * Stroke = 3.812″ * Fits Iron Head Sporty. * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal e...

$619.99

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...

KB PISTONS

$672.99

Features & Benefits:- * Bore = 3.503″ * Stroke = 4.250″ * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter p...

KB PISTONS

$672.99

Features & Benefits:- * Bore = 3.498″ * Stroke = 4.250″ * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter p...

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KB PISTONS

$622.99

* 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 ...

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COLONY MACHINE

$312.99

Features & Benefits:- * High Tensile Aircraft Quality Studs. Proudly Made in the USA by Colony Machine ! Suggested Additional Purchase: Head Bolt Kit # CM-2011-8, CM-2012-8 or FE-3005

$3,794.99

* 117″ Standard Compression – Flat Top Pistons * Note: Crankcases must be bored to accept the larger 4-1/8″ bore cylinders * Compression Ratios: 85cc Stock Heads = 10.9:1 89cc S&S Heads = 10.5...

$3,516.99

Features & Benefits:- * Upgrades Milwaukee-Eight 114ci & non-CVO 117ci to 132ci * 4.320″ Bore * 4.500″ Stroke (4-1/2″) * Forged Pistons. * 11.1 Compression Ratio. * Wrinkle Black Finish. ...