1. Big Bore Kits

Grid List
Athena 290cc Big Bore Cylinder Kit
$842.95 - $844.95
(1 review)
Athena 290cc Big Bore Cylinder Kit Bolt on kit, no machining required Aluminum cylinder with nickel-carbide coating designed with wider water jackets Complete piston kit, Forged piston with molybdenum coating Complete top end gasket set Easy to follow step-by-step installation instructions Average…
Athena 280cc Big Bore Cylinder Kit
$750.95 - $917.95
Athena 280cc Big Bore Cylinder Kit Bolt on kit, no machining required Aluminum cylinder with nickel-carbide coating designed with wider water jackets Complete piston kit, Forged piston with molybdenum coating Complete top end gasket set Easy to follow step-by-step installation instructions Average…
Revolution Performance Bolt-On Big Bore Kit
$1033.95
…Performance Bolt-On Big Bore KitRevolution aerospace-grade all-aluminum cylinders with nickel-silicon-carbide electroplated bores which means NO SLEEVING; allows larger bore sizes and less friction for more horsepower, lower temps and longer lifespan True bolt-on kit that delivers major power…
Wiseco 440cc Off Road Big Bore Kit
$337.99 - $878.99 MSRP $377.95-$985.95
Wiseco 440cc Off Road Big Bore Kit Kit Includes: Piston, Rings Wrist pin Circlips Gasket kit Nikasil lined cylinder Compression ratios are as follows Honda XR400 Kit has 12.5:1 Kawasaki/Suzuki KLX/DRZ400 Kits Available in 12.5:1, and 13.5:1 **Note: XR400 Cylinder includes cylinder sleeve not…
BBR 143cc Big Bore Kit
$323.99 MSRP 359.95
BBR 143cc Big Bore Kit The largest displacement bore kit available without the need to bore engine cases. Comes complete with aluminum cylinder, mx grind camshaft, piston, rings, piston pin, clips, and gaskets. Aluminum cylinder with plated aluminum sleeve BBR high-performance camshaft 60mm…
Athena 2-Stroke 70cc Big Bore Kit
$202.95 MSRP 208.95
(3 reviews)
Athena 2-Stroke 70cc Big Bore KitAthena's Big Bore Kit features a cast aluminum cylinder with a nickel carbide plated bore. All Athena kits come with a cylinder, cylinder head, piston assembly (piston, rings, wrist pin, and circlips) carbon reeds and all top end gaskets necessary for installation.…
Wiseco Pro Lite Piston Kit
$78.99 - $214.99 MSRP $87.95-$240.95
(12 reviews)
Wiseco Pro Lite Piston Kit Available for both two stroke and four stroke bikes, the Wiseco Pro Lite Piston Kit is both a great OEM alternative and an easy way to boost the power. Choose stock bore sizes or go big bore, either way Wiseco pistons and rings will increase the power and last under racing…
Two Brothers Racing Pitboss 143cc Big Bore Kit
$229.99 MSRP 269.98
…143cc Big Bore Kit You'll set the track on fire with Pit Boss Racing's 143cc bore up kit brought to you exclusively by Two Brothers Racing. With its 60mm cylinder & piston you'll be sitting on a full 143cc of raw power! Kit includes: Precision built 60mm cylinder 60mm piston Gasket kit Rings…
BBR 150cc Big Bore Kit
$359.99 MSRP 399.95
BBR 150cc Big Bore Kit Add some grunt to your bike with one of BBR's Big Bore Complete Cylinder Kits. Features: New aluminum cylinder with steel liner is bored, honed and ready to assemble High performance camshaft Piston Rings Clips Head gasket Base gasket Requires no exchange
S&S Cycle 106 Big Bore Kit
$789.95
S&S Cycle 106" Big Bore Kit At 3.927? bore, these cylinders have the largest bore that S&S feels can safely be used in a cylinder with stock spigot diameter This kit is only offered with S&S cylinders because the cylinder liner material in S&S cylinders is much stronger, and has proven its ability…
S&S Cycle 95 Twin Cam Big Bore Kit
$824.95
S&S Cycle 95" Twin Cam Big Bore Kit Available in black or silver powder-coat finish Big bore 37/8" cylinders 9.7:1 compression ratio with stock heads Kits include cylinders, pistons, rings and gaskets (head, base and exhaust) Made in the U.S.A. **Closeouts are limited to stock on hand**
Athena Racing Carburetor
$105.95 - $151.95
…Dellorto-manufactured carburetors feature a 17.5mm inlet, 5mm larger than stock Performance designed to accompany Athena's 70cc big bore kits for scooters **Notes: Requires Electric Choke Kit Carburetor is a universal item and may require additional modifications to throttle and/or throttle housing
Vertex Piston Kit
$46.99 - $247.95
(1 review)
…which produces an extremely light but very strong piston Four-stroke pistons are forged from 2618 aluminum for superior strength and durability High compression pistons improve power and torque across entire rpm range Big bore pistons increase engine’s displacement, torque and peak horsepower
Athena 490cc Big Bore Cylinder Kit
$816.95 - $870.95
Athena 490cc Big Bore Cylinder Kit Bolt on kit, no machining required Aluminum cylinder with nickel-carbide coating designed with wider water jackets Complete piston kit, Forged piston with molybdenum coating Complete top end gasket set Easy to follow step-by-step installation instructions Average…
Wiseco 500cc Off Road Big Bore Kit
$943.99
Wiseco 500cc Off Road Big Bore Kit Displacement - 498cc Bore size - 3.976" 101mm +5mm oversize Stroke - 62.1mm Compression ratio - 12.5:1 Kit Includes: Piston Rings Wrist pin Circlips Steel head gasket gasket 101mm Nikasil lined cylinder
Dragonfire Big Bore Piston and Ring Set
$474.99 MSRP 499.99
Dragonfire Big Bore Piston and Ring SetConstructed of forged 2618 alloy, the same material used in NASCAR Racing engines Manufactured to meet exact specifications to promote flame propagation, increased power and excellent service life Kit includes- Pistons, Rings, Wrist pins and circlips
Athena 480cc Big Bore Cylinder Kit
$532.95 - $935.95
Athena 480cc Big Bore Cylinder Kit Bolt on kit, no machining required Aluminum cylinder with nickel-carbide coating designed with wider water jackets Complete piston kit, Forged piston with molybdenum coating Complete top end gasket set Easy to follow step-by-step installation instructions Average…
Athena Top End Gasket Kit
$15.95 - $100.95
(1 review)
Athena Top End Gasket Kit Manufactured in “State-of-the-Art” computer controlled facilities All gaskets made from the highest quality materials All gasket sets meet or exceed OEM specifications The best gaskets available today 60% of European manufacturers use these gaskets OEM
S&S Cycle 97 Big Bore Kit
$789.95
S&S Cycle 97" Big Bore Kit The 97" Big Bore kit for 88" motors yield excellent results with stock cylinder heads Feature the largest bore (3.927") that can safely be used in a cylinder with stock spigot diameter Even though stock cylinders can be bored to fit the 3.927" pistons, the included S&S…
Athena 430cc Big Bore Cylinder Kit
$823.95
Athena 430cc Big Bore Cylinder Kit Bolt on kit, no machining required Aluminum cylinder with nickel-carbide coating designed with wider water jackets Complete piston kit, Forged piston with molybdenum coating Complete top end gasket set Easy to follow step-by-step installation instructions Average…
Athena Hyper Race 70cc Big Bore Kit
$1076.95
Athena Hyper Race 70cc Big Bore Kit The Hyper Race 70cc Complete Big Bore Kit is the race version of the popular Athena 70cc Big Bore kit with all of the components you need to make your engine race ready! Includes:Shaped, domed cylinder head State of the art cylinder with special porting Lighter…
Dragonfire Hot Coil
$189.99 MSRP 199.99
Dragonfire Hot Coil Dragonfires Hot Coil creates increased spark to handle more fuel when adding performance parts such as intake, jet kits, and big bore kits.
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