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…
Hot Rods Complete Bottom End Rebuild Kit
$218.99 - $655.99 You save up to $33.96 (4%)
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…Rebuild Kit A life saver when things go south for your engine, the Hot Rods Complete Bottom End Rebuild Kit features all the parts you need to get back on the track. Additionally, choose between maintaining stock displacement or going larger with a stroker big bore. Hot Rods Bottom Ends kits offer…
Wiseco 440cc Off Road Big Bore Kit
$337.99 - $878.99 You save up to $106.96 (10%)
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…
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
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…
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 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…
…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…
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…
…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…
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…
Dragonfire Big Bore Piston and Ring Set
$474.99 You save $25.00 (5%)
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
BBR 150cc Big Bore Kit
$359.99 You save $39.96 (9%)
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
Vertex Piston Kit
$46.99 - $247.95
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Vertex Piston Kit Restore that crisp clean power that your dirtbike or quad use to have with a new Piston Kit from Vertex. Or step up the power with a high compression Piston Kit, All kits are standard compression unless noted. All pistons are heat-treated with a T-5 hardening and tempering cycle;…
Closeout 11% off
Wiseco Pro Lite Piston Kit
$77.69 - $214.99 You save up to $25.96 (11%)
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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…
BBR 88cc FTP Big Bore Kit with Cam
$197.99 You save $21.96 (9%)
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 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
Athena 2-Stroke 70cc Big Bore Kit
$202.95 You save $6.00 (2%)
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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.…
BBR 143cc Big Bore Kit
$323.99 You save $35.96 (9%)
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…
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 Top End Gasket Kit
$15.95 - $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…
BikeMaster Piston Ring Compressor Set
$101.96 You save $17.99 (15%)
…precise adjustments of the ring bands Fits wide range of motorcycles from dirt bikes to big V-Taiwan ins from 2-7/8" to 4-3/8" (73 to 111mm) cylinder bores all in one kit Piston ring bands are identified with bottom of cylinder markings for easy installation Kit comes in a heavy-duty carrying case
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…
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