Cylinders & Pistons - M8

31 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.

$3,906.99

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...

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

$3,722.99

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...

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

$3,725.99

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...

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

$3,722.99

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.

$3,725.99

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.

$3,725.99

FEULING

$1,469.99

* 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

$1,311.99

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

$1,311.99

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...

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CP CARRILLO PISTONS

$1,311.99

Features & Benefits:- * ID # 12873 * Bore = 4.310″ * Stroke = 4.500″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed...

CP CARRILLO PISTONS

$1,310.99

Features & Benefits:- * ID # 12873 * Bore = 4.250″ * Stroke = 4.500″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed...

CP CARRILLO PISTONS

$1,311.99

Features & Benefits:- * ID # 12875 * Bore = 4.250″ * Stroke = 4.375″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed...

KB PISTONS

$1,136.99

Features & Benefits:- * Super Duty KB Forged Coated Anodized Piston Kit. * 107ci to Big bore 124″ piston kit for Milwaukee 8 when using 4.250″ Bore Cylinders * No head modification required ...

KB PISTONS

$1,136.99

Features & Benefits:- * Super Duty KB Forged Coated Anodized Piston Kit. * 114 or 117ci to Big bore 128″ piston kit for Milwaukee 8 when using 4.250″ Bore Cylinders * No head modification req...

CP CARRILLO PISTONS

$1,098.99

Features & Benefits:- * ID # 12776 * Bore = 4.180″ * Stroke = 4.375″ * Fully CNC machined * Balanced to +/- 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed...