Dirt Bike Cylinders and Parts
Dirt Bike Cylinders & Cylinder Kits for Yamaha, Kawasaki, KTM & Husqvarna at JJ Motorsports
Rebore or replace your dirt bike's cylinder with premium OEM-spec and big-bore cylinders from JJ Motorsports, precision-machined for perfect piston fit, maximum heat dissipation, and race-proven durability in motocross, enduro, and trail riding. Our selection includes standard bore replacements and performance cylinders from Cylinder Works, Moose Racing, and Wossner, complete with plating options for long life and easy installation. Compatible with top models like Yamaha YZ/WR250F, Kawasaki KX250F, KTM 85 SX, Husqvarna TC85, and Gas Gas MC85, these high-quality cylinders restore compression, increase displacement when paired with big-bore kits, and deliver reliable performance in dusty, high-heat conditions. Whether refreshing a scored cylinder or building a big-bore stroker, these components provide exact OEM tolerances or upgraded plating for superior wear resistance and championship-level power on every ride.
At JJ Motorsports, we stock the best dirt bike cylinders and kits from Cylinder Works, Moose Racing, and Wossner with fast shipping and expert support. Free shipping over $99!
Top Dirt Bike Cylinders & Kits
- Cylinder Works Standard Bore Cylinder 66.40mm Yamaha YZ250F/WR250F 20009 – OEM-spec replacement cylinder for Yamaha YZ250F and WR250F; ready for stock or big-bore piston, nickel-silicon carbide plating for ultimate wear resistance.
- Moose Racing Standard Cylinder Kawasaki KX250F MSE30012 – Direct OEM replacement cylinder for Kawasaki KX250F 2004-2016; precision-machined with plating for perfect fit and long life.
- Wossner Cylinder 47.00mm KTM/Husqvarna/Gas Gas 85 WBC8147A – High-performance cylinder for KTM 85 SX, Husqvarna TC85, and Gas Gas MC85; forged construction with advanced plating for 85cc 2-stroke power and durability.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
Cylinder Works Big Bore Kit Yamaha YZ450F 2006-2009 WR450F 2007-2015 21003-K01
CYLINDER WORKS
MSRP: $873.95Now: $786.56Was: $873.95Enhance your engine's performance with the CYLINDER WORKS Big Bore Kit, designed for easy installation and superior durability. This ready-to-install kit features OEM-like aesthetics and is engineered for optimal power and reduced noise, ensuring a...09310174- SKU:
- 09310174
- Availability:
- Ships Same Business Day
- Weight:
- 4.04 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 478 CC
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- OVERBORE METRIC:
- +3.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $873.95Now: $786.56Was: $873.95Qty in Cart: 0Quantity:Price:MSRP: $873.95Now: $786.56Was: $873.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit for Honda CRF250R 2004-2009 2012-2013 CRF250X 2004-2017 11001-K01
CYLINDER WORKS
MSRP: $752.95Now: $677.66Was: $752.95Enhance your engine's performance with the Cylinder Works Big Bore Kit 11001-K01. Designed for easy installation, this kit provides a seamless upgrade without the need for re-plating. Experience improved longevity and reduced noise with our premium...09310118- SKU:
- 09310118
- Availability:
- Ships Same Business Day
- Weight:
- 3.03 LBS
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- CYLINDER DIAMETER:
- 81,00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $752.95Now: $677.66Was: $752.95 -
On Sale
ATHENA Cylinder Kit - RMZ450 - 100mm P400510100006
ATHENA
MSRP: $1,156.95Now: $1,041.00Was: $1,156.95The ATHENA Cylinder Kit delivers measurable gains in displacement and compression for the RMZ450, translating directly to increased horsepower and throttle response. The nickel-carbide coated aluminum cylinder and molybdenum-coated forged piston are...09310114- SKU:
- 09310114
- Availability:
- Ships Same Business Day
- Weight:
- 3.73 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 490 CC
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $1,156.95Now: $1,041.00Was: $1,156.95 -
On Sale
ATHENA Cylinder Kit - KX125 - 58mm P400250100011
ATHENA
MSRP: $1,201.95Now: $1,082.00Was: $1,201.95The ATHENA Cylinder Kit delivers the displacement and reliability your KX125 demands when stock limits won't cut it. With a 58mm bore, optimized water jacket design, and factory-grade coatings, you're getting race-proven engineering that bolts straight...09310109- SKU:
- 09310109
- Availability:
- Ships Same Business Day
- Weight:
- 5.62 LBS
- BORE SIZE METRIC:
- 58.00 MM
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,201.95Now: $1,082.00Was: $1,201.95 -
On Sale
ATHENA Cylinder Kit - KX65 - 50mm P400250100007
ATHENA
MSRP: $932.95Now: $840.00Was: $932.95If you're pushing your KX65 to its limits, a worn or compromised cylinder is a bottleneck you can't afford. The ATHENA Cylinder Kit delivers measurable gains in compression consistency and heat dissipation, translating directly to more responsive...09310107- SKU:
- 09310107
- Availability:
- Ships Same Business Day
- Weight:
- 3.31 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 80 CC
- BORE SIZE METRIC:
- 50.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
MSRP: $932.95Now: $840.00Was: $932.95Qty in Cart: 0Quantity:Price:MSRP: $932.95Now: $840.00Was: $932.95Subtotal: -
On Sale
ATHENA Cylinder Kit - YZ125 - 54mm P400485100017
ATHENA
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95The ATHENA Cylinder Kit delivers the displacement and reliability your YZ125 needs to stay competitive on the track. With a larger 54mm bore and premium coatings engineered for durability, this kit provides measurable power gains while maintaining the...09310095- SKU:
- 09310095
- Availability:
- Ships Same Business Day
- Weight:
- 5.61 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CYLINDER KIT
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STOCK BORE
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95 -
On Sale
ATHENA Cylinder Kit - Yamaha 070200
ATHENA
MSRP: $262.95Now: $237.00Was: $262.95Restore your Yamaha's peak performance with a complete cylinder kit engineered for reliability and longevity. The ATHENA 070200 combines a reinforced aluminum cylinder with advanced thermal management and a forged piston designed to handle sustained...09310077- SKU:
- 09310077
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- DISPLACEMENT:
- 70 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 47.66 MM
- MATERIAL:
- ALUMINUM
MSRP: $262.95Now: $237.00Was: $262.95 -
On Sale
ATHENA Cylinder Kit - Yamaha/Malaguti 070100
ATHENA
MSRP: $262.95Now: $237.00Was: $262.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310076- SKU:
- 09310076
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- DISPLACEMENT:
- 70 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 47.66 MM
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- ALUMINUM
MSRP: $262.95Now: $237.00Was: $262.95 -
On Sale
ATHENA Cylinder Kit - KLX/DRZ/KFX/LTZ400 P400510100002
ATHENA
MSRP: $1,117.95Now: $1,006.00Was: $1,117.95Stock cylinder limitations can compromise peak horsepower and throttle response on your KLX, DRZ, KFX, or LTZ400. The ATHENA Cylinder Kit delivers measurable gains through advanced materials and thermal engineering—larger water jackets keep temperatures...09310016- SKU:
- 09310016
- Availability:
- Ships Same Business Day
- Weight:
- 4.96 LBS
- DISPLACEMENT:
- 435 CC
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 94.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,117.95Now: $1,006.00Was: $1,117.95 -
On Sale
ATHENA Cylinder Kit - DRZ/KFX P400510100001
ATHENA
MSRP: $772.95Now: $696.00Was: $772.95Stock cylinder limits your engine's potential, especially if you're running higher compression or extended operating hours. The ATHENA Cylinder Kit delivers measurable gains in peak power and reliability through precision engineering and materials...09310015- SKU:
- 09310015
- Availability:
- Ships Same Business Day
- Weight:
- 4.71 LBS
- BORE SIZE METRIC:
- 90.00 MM
- MATERIAL:
- ALUMINUM
- STYLE:
- STOCK BORE
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CYLINDER KIT
- DISPLACEMENT:
- 400 CC
MSRP: $772.95Now: $696.00Was: $772.95 -
On Sale
ATHENA Cylinder Kit - KX125 - 54mm P400250100001
ATHENA
MSRP: $970.95Now: $874.00Was: $970.95The ATHENA Cylinder Kit delivers the displacement and thermal management your KX125 needs to compete at the highest levels. A larger 54mm bore paired with advanced nickel-carbide coating and optimized water jackets ensures consistent performance in...09310012- SKU:
- 09310012
- Availability:
- Ships Same Business Day
- Weight:
- 6.18 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CYLINDER KIT
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STOCK BORE
MSRP: $970.95Now: $874.00Was: $970.95 -
WSM Cylinder Kit - Yamaha 010-6029K
WSM
$766.42The WSM Cylinder Kit 010-6029K delivers OEM-matched performance and reliability without compromise. Whether you're rebuilding after a race season or restoring your engine to factory specifications, this kit ensures precise fitment and durability across...09310530- SKU:
- 09310530
- Availability:
- Ships Same Business Day
- Weight:
- 7.81 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NIKASIL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$766.42 -
Pro Circuit Stainless Steel Power Valve for Kawasaki KX85 2002-2013 PVK01085
PRO CIRCUIT
$229.95Unlock the full potential of your engine with the PRO CIRCUIT Power Valve PVK01085. Designed to optimize exhaust flow, this high-performance valve enhances bottom-end torque while maintaining peak horsepower. Crafted from durable billet stainless steel,...09310477- SKU:
- 09310477
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- POWER VALVE
$229.95 -
MOOSE RACING Cylinder - Standard - KX85 MSE30009
MOOSE RACING
$467.95If your KX85 has suffered cylinder damage or excessive wear, a factory-spec replacement is essential to restore compression, ring sealing, and overall engine performance. The MOOSE RACING cylinder delivers OEM-equivalent bore geometry and durability...09310623- SKU:
- 09310623
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- UNITS:
- EACH
$467.95 -
MOOSE RACING Cylinder - Standard - Honda MSE10010
MOOSE RACING
$390.95A worn or damaged cylinder directly compromises compression, power delivery, and engine reliability—especially in high-demand racing and performance applications. The MOOSE RACING Cylinder restores OEM specifications with superior durability and thermal...09310972- SKU:
- 09310972
- Availability:
- Ships Same Business Day
- Weight:
- 3.11 LBS
- BORE SIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$390.95Qty in Cart: 0Quantity:Price:$390.95Subtotal: -
LA Sleeve Cylinder Sleeve for 2004 Honda CR125R 54mm Bore H5568
LA SLEEVE
$127.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5568, designed to restore the performance of worn-out cylinders. Engineered from high-quality materials, this replacement sleeve ensures a perfect fit and long-lasting durability, making it an...09310059- SKU:
- 09310059
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- TYPE:
- AC
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1997-2005 Kawasaki KDX220R 69mm Bore KA5319
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5319, designed for exceptional durability and performance. This high-quality replacement sleeve ensures a perfect fit and enhances the longevity of your engine, making it an ideal choice for...09310083- SKU:
- 09310083
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 69.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
LA Sleeve Cylinder Sleeve for Honda XR-650L 1993-2023 H5160
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5160, designed to restore the performance of worn-out cylinders. Crafted from high-quality materials, these sleeves ensure durability and a perfect fit, making them an essential component for any...09310151- SKU:
- 09310151
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 100.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- EACH
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
LA Sleeve Cylinder Rebuild Kit for 1998-2000 Kawasaki KX80 LAS-5351K
LA SLEEVE
$312.95Revitalize your Kawasaki's performance with the LA SLEEVE Sleeve and Piston Kit. This comprehensive top-end rebuild kit is engineered for optimal efficiency, featuring advanced materials that enhance ring seal, boost compression, and elevate torque and...09310384- SKU:
- 09310384
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- CAST
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
LA Sleeve Cylinder Sleeve for 2001 Kawasaki KX125 KA5451
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5451, designed for optimal performance and durability. This high-quality replacement sleeve restores the integrity of worn cylinders, ensuring your machinery runs smoothly and efficiently...KA5451- SKU:
- KA5451
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal:
