JavaScript Disabled

To get the full RevZilla experience, enable JavaScript in your browser settings and refresh this page.

Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders

Free Shipping over $49.99 ZillaCash: $5 for every $100 Customer Service From Riders

Motorcycle Big Bore Kits

63ProductsProduct

Categories

Shop All

Filters

Shop Your Ride

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

Vehicle Specific

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

$106 in Rewards

S&S Cycle Power Pack For Harley Twin Cam

Vehicle Specific

S&S Cycle Power Pack For Harley Twin Cam

$185 in Rewards

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

Vehicle Specific

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

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

$3,359^.⁹⁵$3,559^.⁹⁵

$183 in Rewards

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle 128" Big Bore Kit For Harley 114" / 117" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 128" Big Bore Kit For Harley 114" / 117" Milwaukee-Eight 2017-2026

S&S Cycle 107" Big Bore Kit For Harley Twin Cam 2006-2017

Vehicle Specific

S&S Cycle 107" Big Bore Kit For Harley Twin Cam 2006-2017

S&S Cycle High Compression 132" / 136" Big Bore Kit For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle High Compression 132" / 136" Big Bore Kit For Harley Milwaukee-Eight 2017-2026

$108 in Rewards

S&S Cycle 124" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 124" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

S&S Cycle 132" Big Bore Kit For Harley 114" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Big Bore Kit For Harley 114" Milwaukee-Eight 2017-2026

S&S Cycle 110" Sidewinder Big Bore Kit For Harley Twin Cam 2007-2017

Vehicle Specific

S&S Cycle 110" Sidewinder Big Bore Kit For Harley Twin Cam 2007-2017

$1,540^.⁹⁵$1,550^.⁹⁵

S&S Cycle 98" Big Bore Kit For Harley Big Twin 1999-2006

Vehicle Specific

S&S Cycle 98" Big Bore Kit For Harley Big Twin 1999-2006

$1,358^.⁹⁵$1,386^.⁹⁵

Cylinder Works Big Bore Cylinder Kit

Vehicle Specific

Cylinder Works Big Bore Cylinder Kit

$660^.²⁰$1,532^.³⁰$694.95$1,612.95

S&S Cycle 97" Big Bore Kit For Harley Big Twin 1999-2006

Vehicle Specific

S&S Cycle 97" Big Bore Kit For Harley Big Twin 1999-2006

$1,219^.⁹⁵$1,287^.⁹⁵

S&S Cycle 1250 Big Bore Kit For Harley Sportster 1986-2022

Vehicle Specific

S&S Cycle 1250 Big Bore Kit For Harley Sportster 1986-2022

$1,008^.⁹⁵$1,077^.⁹⁵

V-Twin Mfg. 95" Big Bore Cylinder Kit For Harley Twin Cam 1999-2006

Vehicle Specific

V-Twin Mfg. 95" Big Bore Cylinder Kit For Harley Twin Cam 1999-2006

S&S Cycle 100" Sidewinder Big Bore Kit For Harley Twin Cam 1999-2006

Vehicle Specific

S&S Cycle 100" Sidewinder Big Bore Kit For Harley Twin Cam 1999-2006

S&S Cycle 95" Cylinder and Piston Kit For Harley Twin Cam 1999-2006

Vehicle Specific

S&S Cycle 95" Cylinder and Piston Kit For Harley Twin Cam 1999-2006

S&S Cycle 74" Top End Kit For Harley Shovelhead 1966-1978

Vehicle Specific

S&S Cycle 74" Top End Kit For Harley Shovelhead 1966-1978

$198 in Rewards

S&S Cycle 106" Big Bore Kit For Harley Big Twin 2007-2017

Vehicle Specific

S&S Cycle 106" Big Bore Kit For Harley Big Twin 2007-2017

$1,219^.⁹⁵$1,287^.⁹⁵

V-Twin Mfg. 1200cc Conversion Kit For Harley Sportster 883-1986-2003

Vehicle Specific

V-Twin Mfg. 1200cc Conversion Kit For Harley Sportster 883-1986-2003

S&S Cycle 80" Top End Kit For Harley Shovelhead 1979-1984

Vehicle Specific

S&S Cycle 80" Top End Kit For Harley Shovelhead 1979-1984

$198 in Rewards

S&S Cycle 124" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 124" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

S&S Cycle 124" Big Bore Kit For Harley Twin Cam 2006-2017

Vehicle Specific

S&S Cycle 124" Big Bore Kit For Harley Twin Cam 2006-2017

S&S Cycle 124" Big Bore Kit For Harley Twin Cam 2006-2017 [Open Box]

Vehicle Specific

S&S Cycle 124" Big Bore Kit For Harley Twin Cam 2006-2017 [Open Box]

$1,479^.⁵⁶$1,643.95

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026

$3,265^.⁹⁵$3,460^.⁹⁵

$178 in Rewards

S&S Cycle 124" Power Package For Harley Oil Cooled 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 124" Power Package For Harley Oil Cooled 107" Milwaukee-Eight 2017-2026

$3,265^.⁹⁵$3,460^.⁹⁵

$178 in Rewards

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2023

Vehicle Specific

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2023

$3,359^.⁹⁵$3,559^.⁹⁵

$183 in Rewards

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2026

$3,359^.⁹⁵$3,559^.⁹⁵

$183 in Rewards

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 129" Power Pack For Harley With 107" Milwaukee-Eight 2017-2026

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026

$3,265^.⁹⁵$3,497^.⁹⁵

$178 in Rewards

S&S Cycle Power Package For Harley Twin Water Cooled 107" Milwaukee-Eight 2017-2024

Vehicle Specific

S&S Cycle Power Package For Harley Twin Water Cooled 107" Milwaukee-Eight 2017-2024

$3,265^.⁹⁵$3,460^.⁹⁵

$178 in Rewards

S&S Cycle Power Package For Harley Twin Cooled 114" / 117" Milwaukee-Eight 2017-2025

Vehicle Specific

S&S Cycle Power Package For Harley Twin Cooled 114" / 117" Milwaukee-Eight 2017-2025

$3,265^.⁹⁵$3,460^.⁹⁵

$178 in Rewards

S&S Cycle 124" Power Package For Harley Oil Cooled 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 124" Power Package For Harley Oil Cooled 107" Milwaukee-Eight 2017-2026

$3,265^.⁹⁵$3,695^.⁹⁵

$178 in Rewards

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026 No Highlight / Chrome Pushrod Tubes / Gear Drive [Blemished - Good]

Vehicle Specific

S&S Cycle Power Package For Harley Oil Cooled 114" / 117" Milwaukee-Eight 2017-2026 No Highlight / Chrome Pushrod Tubes / Gear Drive [Blemished - Good]

$2,612^.⁷⁶$3,265.95

$146 in Rewards

S&S Cycle Power Package For Harley Milwaukee-Eight 107"

Vehicle Specific

S&S Cycle Power Package For Harley Milwaukee-Eight 107"

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle Power Package For Harley Milwaukee-Eight 114" / 117"

Vehicle Specific

S&S Cycle Power Package For Harley Milwaukee-Eight 114" / 117"

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam 1999-2006

Vehicle Specific

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam 1999-2006

$370 in Rewards

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026

$3,359^.⁹⁵$3,559^.⁹⁵

$183 in Rewards

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026 Gear Drive / Black Granite w/ Highligh... [Open Box]

Vehicle Specific

S&S Cycle 132" Power Pack For Harley Milwaukee-Eight 2017-2026 Gear Drive / Black Granite w/ Highligh... [Open Box]

$3,203^.⁹⁶$3,559.95

$175 in Rewards

Cylinder Works HC Big Bore Cylinder Kit Kawasaki Brute Force 750 2015-2023

Vehicle Specific

Cylinder Works HC Big Bore Cylinder Kit Kawasaki Brute Force 750 2015-2023

$1,382^.²⁰$1,454.95

S&S Cycle 750cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2026

Vehicle Specific

S&S Cycle 750cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2026

Koso 150CC Big Bore Kit Honda Grom / Monkey 2022-2026

Vehicle Specific

Koso 150CC Big Bore Kit Honda Grom / Monkey 2022-2026

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam A 2006-2017

Vehicle Specific

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam A 2006-2017

$370 in Rewards

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam B 2007-2017

Vehicle Specific

S&S Cycle 124" Hot Set-Up Kit For Harley Twin Cam B 2007-2017

$370 in Rewards

S&S Cycle 124" Hot Set-Up Kit For Harley Softail 2001-2006

Vehicle Specific

S&S Cycle 124" Hot Set-Up Kit For Harley Softail 2001-2006

$370 in Rewards

S&S Cycle 132" Power Pack For Twin Cooled Harley Touring 2017-2024

Vehicle Specific

S&S Cycle 132" Power Pack For Twin Cooled Harley Touring 2017-2024

$3,359^.⁹⁵$3,559^.⁹⁵

$183 in Rewards

S&S Cycle 132" Power Pack For Twin Cooled Harley Touring 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack For Twin Cooled Harley Touring 2017-2026

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle 132" Power Pack With 496 Cam For Harley Twin Cooled Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack With 496 Cam For Harley Twin Cooled Milwaukee-Eight 2017-2026

$3,355^.⁹⁵$3,497^.⁹⁵

$183 in Rewards

S&S Cycle 96" Sidewinder Big Bore Stroker Kit for Harley Evo Big Twin 1984-2000

Vehicle Specific

S&S Cycle 96" Sidewinder Big Bore Stroker Kit for Harley Evo Big Twin 1984-2000

$159 in Rewards

S&S Cycle 132" Power Pack With 496 Cam For Harley Oil Cooled Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 132" Power Pack With 496 Cam For Harley Oil Cooled Milwaukee-Eight 2017-2026

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle 129" Power Pack With 496 Cam For Harley Oil Cooled Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 129" Power Pack With 496 Cam For Harley Oil Cooled Milwaukee-Eight 2017-2026

$3,294^.⁹⁵$3,497^.⁹⁵

$180 in Rewards

S&S Cycle 131" Hot Set Up Kit For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 131" Hot Set Up Kit For Harley Milwaukee-Eight 2017-2026

$150 in Rewards

S&S Cycle 131" Big Bore Stroker Cylinder & Piston Kits For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 131" Big Bore Stroker Cylinder & Piston Kits For Harley Milwaukee-Eight 2017-2026

S&S Cycle 131" Big Bore Stroker Cylinder & Piston Kits For Harley Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 131" Big Bore Stroker Cylinder & Piston Kits For Harley Milwaukee-Eight 2017-2026

S&S Cycle 136" Big Bore Cylinder Kit For Harley Air Cooled Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 136" Big Bore Cylinder Kit For Harley Air Cooled Milwaukee-Eight 2017-2026

S&S Cycle 129" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

Vehicle Specific

S&S Cycle 129" Big Bore Kit For Harley 107" Milwaukee-Eight 2017-2026

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

Vehicle Specific

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

$933^.⁸⁰$982.95

Cylinder Works HC Big Bore Cylinder Kit Yamaha Raptor 700R / SE R 2006-2014

Vehicle Specific

Cylinder Works HC Big Bore Cylinder Kit Yamaha Raptor 700R / SE R 2006-2014

$961^.³⁶$1,011.95

S&S Cycle 865cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2026

Vehicle Specific

S&S Cycle 865cc Big Bore Kit For Royal Enfield Interceptor / Continental GT 650 2019-2026

V-Twin Mfg. 83" Big Bore Cylinder Kit For Harley EVO 1984-2000

Vehicle Specific

V-Twin Mfg. 83" Big Bore Cylinder Kit For Harley EVO 1984-2000

Drag Specialties Replacement Cylinders For Sportster 1200 1988-2003

Vehicle Specific

Drag Specialties Replacement Cylinders For Sportster 1200 1988-2003

$264^.⁹⁵$304^.¹⁷

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

Vehicle Specific

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

1 of 1

$39.99/yr.

Spend Less. Ride More.

5% RPM Cash Back*
10% Off Over 70 Brands
$15 in RPM Cash When You Join
Free 2-Day Shipping & Free Returns*
And more!

Become a member today! Learn More

By purchasing and enrolling in Riders Preferred Membership, you agree to the Program Terms and Conditions. *Some exclusions apply: 10% RPM discount applies on full price and sale price Exclusive Brands. 10% RPM discount applies on additional select brands at full price. Exclusions apply. RPM free 2-day shipping applies on qualifying items, contiguous U.S. only. Not available for AK, HI, or U.S. Territories. View shipping policies. RPM free returns apply on qualifying items and are processed on standard return timeline, contiguous U.S. only. View return policy.