1. Big Bore Kits

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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…
BBR 88cc FTP Big Bore Kit with Cam
$197.99 You save $21.96 (9%)
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BBR 88cc FTP Big Bore Kit with Cam A great combination of power, reliability and easy installation makes this kit our best seller. Cylinder retains mounts for easy skid plate installation. Excellent power gains throughout the RPM range. BBR aluminum cylinder 52mm flat-top piston, rings, pin, clips…
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 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…
BBR 143cc Big Bore Kit
$323.99 You save $35.96 (9%)
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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…
BBR 150cc Big Bore Kit
$359.99 You save $39.96 (9%)
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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
Wiseco 440cc Off Road Big Bore Kit
$283.46 - $739.46 You save up to $246.49 (25%)
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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…
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…
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…
Athena Top End Gasket Kit
$12.99 - $113.95
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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 **Note: Kawasaki…
Dragonfire Racing 975cc Big Bore Kit for RZR XP 900Dragonfire is no stranger to horsepower. They know what it takes to win, after all they have taken both the GNCC & WORCS championships in 2011. The RZR XP motor makes a lot of power sitting at just under 900cc displacement, imagine cranking it up to…
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 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…
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…
Two Brothers Racing Pitboss 143cc Big Bore Kit
$215.98 You save $54.00 (20%)
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Two Brothers Racing Pitboss 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…
Athena 2-Stroke 70cc Big Bore Kit
$179.00 - $202.95 You save up to $6.00 (14%)
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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.…
Dragonfire Racing RZR 857cc Billet Big Bore Kit Through years of experience and passion for racing engines of all types we have continued to develop the best solutions from top to bottom for your side-by-side motor. The Dragonfire team has a well-rounded background in high-performance engine…
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…
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