Cylinders & Pistons

163 products

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

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

$3,885.99

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 2017-2022 with 117ci Engine - S&S

$3,702.99

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...

$3,091.99

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. - S&S

$3,706.99

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. - S&S

$3,705.99

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. - S&S

$3,706.99

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...

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

$3,706.99

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

$2,635.99

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. - S&S

$2,635.99

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

$2,908.99

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-...

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

$2,362.99

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...

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CP CARRILLO PISTONS

$1,824.99

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...

FEULING

$1,460.99

* The strongest studs & bolts available! * Top engine builders demand quality fasteners! Secure your engine with complete confidence * Superior in strength and performance to any other cylinde...

CP CARRILLO PISTONS

$1,294.99

Features & Benefits:- * ID # 14207 * Bore = 4.250″ * Stroke = 4.375″ * Steel gas nitride coated top ring * Ductile iron Napier 2nd ring * Three piece flex vent oil ring * X-forging for lighte...

CP CARRILLO PISTONS

$1,294.99

Features & Benefits:- * ID # 14234 * Bore = 4.250″ * Stroke = 4.375″ * Steel gas nitride coated top ring * Ductile iron Napier 2nd ring * Three piece flex vent oil ring * X-forging for lighte...