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Parts-Engine-Big Bore Kits

Upgrade engine displacement with motorcycle big bore kits for performance builds, restorations and custom projects. Explore compatible cylinders, pistons and components designed to support increased capacity, torque and responsive power delivery.
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S&S Cycle 865cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2021

Regular Price $169.99
Sale Price $169.99 Regular Price $849.95
-80%

S&S Cycle 96

Regular Price $559.19
Sale Price $559.19 Regular Price $2,795.95
-80%

S&S Cycle 107

Regular Price $261.19
Sale Price $261.19 Regular Price $1,305.95
-80%

S&S Cycle 883 To 1200 Conversion Kit For Harley Sportster 1986-2021

Regular Price $219.19
Sale Price $219.19 Regular Price $1,095.95
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S&S Cycle 132

Regular Price $319.99
Sale Price $319.99 Regular Price $1,599.95
-80%

S&S Cycle 750cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2024

Regular Price $173.99
Sale Price $173.99 Regular Price $869.95
-80%

S&S Cycle 124

Regular Price $1,361.79
Sale Price $1,361.79 Regular Price $6,808.95
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Koso 170cc Big Bore Kit With 4V Head Honda Grom 2014-2020

Regular Price $259.80
Sale Price $259.80 Regular Price $1,299.00
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S&S Cycle 98

Regular Price $263.79
Sale Price $263.79 Regular Price $1,318.95
-80%

Cylinder Works HC Big Bore Cylinder Kit Yamaha Grizzly / Rhino 700 2007-2013

Regular Price $181.99
Sale Price $181.99 Regular Price $909.95
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S&S Cycle 128

Regular Price $312.39
Sale Price $312.39 Regular Price $1,561.95
-80%

S&S Cycle 110

Regular Price $310.19
Sale Price $310.19 Regular Price $1,550.95
-65%

Koso Gasket for Koso Big Bore Kit Honda Grom / Monkey 2014-2020

Regular Price $14.70
Sale Price $14.70 Regular Price $42.00
-80%

Cylinder Works HC Big Bore Cylinder Kit Kawasaki Brute Force / Teryx 750 2005-2014

Regular Price $290.99
Sale Price $290.99 Regular Price $1,454.95
-80%

Koso 150CC Big Bore Kit Honda Grom / Monkey 2022-2025

Regular Price $107.40
Sale Price $107.40 Regular Price $537.00
-75%

Drag Specialties Replacement Cylinders For Sportster 1200 1988-2003

Regular Price $63.50
Sale Price $63.50 Regular Price $254.00
-73%

BBR Motorsports Big Bore Kit

Regular Price $53.73
Sale Price $53.73 Regular Price $199.00
-80%

S&S Cycle 129

Regular Price $671.99
Sale Price $671.99 Regular Price $3,359.95
-80%

S&S Cycle Hooligan Big Bore Cam Kit For Harley Sportster

Regular Price $341.99
Sale Price $341.99 Regular Price $1,709.95
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S&S Cycle 124

Regular Price $1,399.99
Sale Price $1,399.99 Regular Price $6,999.95
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