Cylinders & Pistons

168 products

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

132ci Big Bore Kit with Highlighted Fins – Black. Fits Milwaukee-Eight 2017up 114ci or 117ci Engine.

$3,497.99

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. ...

$2,902.99

Features & Benefits:- * Includes Cast Flat Top Pistons. * Includes Gaskets. * 8.5:1 Compression Ratio with Stock HD Heads. * 8.8:1 Compression Ratio with S&S 76cc Performance Heads # SS106...

129ci Big Bore Kit with Highlighted Fins – Black. Fits Milwaukee-Eight 2017up with 107ci Engine.

$3,388.99

Features & Benefits:- * Upgrades Milwaukee-Eight 107ci to 129ci. * 4.320″ Bore. * 4.375″ Stroke (4-3/8″). * Forged Pistons. * 11.1 Compression Ratio. * Wrinkle Black Finish. * With Highlighted...

128ci Big Bore Kit with Highlighted Fins – Black. Fits Milwaukee-Eight 2017up 114ci Engine.

$3,171.99

Features & Benefits:- * Upgrades Milwaukee-Eight 114ci to 128ci * 114ci to 128ci Big Bore Kit * 4.250″ Bore * 4.500″ Stroke (4-1/2″) * Forged Pistons. * 11.1 Compression Ratio. * Wrinkle Blac...

132ci Big Bore Kit with Non-Highlighted Fins – Black. Fits Milwaukee-Eight 2017up 114ci or 117ci Engine.

$3,397.99

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...

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129ci Big Bore Kit with Non-Highlighted Fins – Black. Fits Milwaukee-Eight 2017up with 107ci Engine.

$3,397.99

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1200cc Big Bore Kit – Silver. Fits Sportster 1986-2021 with 883cc Engine.

$2,433.99

Features & Benefits:- * Will Not Fit XR1200 * Includes silver cylinders. * Includes MLS Head Gaskets, Base Gaskets & Exhaust Gaskets. * Includes assembly lube & instructions. * No mac...

1200cc Big Bore Kit – Wrinkle Black. Fits Sportster 1986-2021 with 883cc Engine.

$2,433.99

Features & Benefits:- * Will Not Fit XR1200 * Includes Black Cylinders. * Includes MLS Head Gaskets, Base Gaskets & Exhaust Gaskets. * Includes Assembly lube & Instructions. * No mach...

$2,734.99

Features & Benefits:- * Includes Cast Flat Top Pistons. * Includes Gaskets. * 8.5:1 Compression Ratio with Stock HD Heads * 8.8:1 Compression Ratio with S&S 76cc Performance Heads # SS106-...

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1250cc Big Bore Kit – Black. Fits Sportster 1986-2021

$2,181.99

Features & Benefits:- * Fits Sportster 1986-2021 including Sportster 2004-2021. * Will Not Fit XR1200 * Includes Black Cylinders. * Includes Flat Top Pistons. * Includes Head Gaskets. * 10.3:1...

650cc -> 865cc Big Bore Kit. Fits Royal Enfield 650 Twins 2019up

$1,898.99

Features & Benefits:- * This kit, when paired with an S&S Cam & exhaust totally changes the ride of the RE650 for the better. Transform your bike into a much more fun & exhilaratin...

CP CARRILLO PISTONS

$1,668.99

Features & Benefits:- * Bore = 4.250″ * Stroke = 3.085″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed for maximum p...

CP CARRILLO PISTONS

$1,668.99

Features & Benefits:- * Bore = 4.134″ * Stroke = 2.953″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed for maximum p...

CP CARRILLO PISTONS

$1,668.99

Features & Benefits:- * Bore = 4.134″ * Stroke = 2.835″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed for maximum p...

CP CARRILLO PISTONS

$1,668.99

Features & Benefits:- * Bore = 4.134″ * Stroke = 2.835″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed for maximum p...