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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LA Sleeve Cylinder Sleeve for 1997-1998 Honda CR250R 66.4mm Bore H5318
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5318, designed for optimal performance and durability. This high-quality replacement sleeve is engineered to restore the integrity of your old cylinders, ensuring longevity and efficiency in your...H5318- SKU:
- H5318
- Availability:
- Ships Same Business Day
- Weight:
- 1.44 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95 -
LA Sleeve Cylinder Sleeve for Suzuki RMX250 1993-1998 FL5271
LA SLEEVE
$153.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5271, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and restores functionality to worn-out cylinders, making it an essential...FL5271- SKU:
- FL5271
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$153.95Qty in Cart: 0Quantity:Price:$153.95Subtotal: -
LA SLEEVE Cylinder Sleeve for Suzuki RM85 2002-2008 FL5419
LA SLEEVE
$171.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5419, designed for optimal performance and durability. These high-quality replacement sleeves offer a perfect fit, ensuring your engine runs smoothly and efficiently. Upgrade your old cylinders...FL5419- SKU:
- FL5419
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
LA Sleeve Cylinder Sleeve 66.40mm Bore 2012 Suzuki RM-Z450 FL5465
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5465, designed to enhance performance and extend the life of your cylinders. Made from high-quality materials, this replacement sleeve offers a perfect fit and durability, ensuring optimal...FL5465- SKU:
- FL5465
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 2004-2005 Kawasaki KX125 54mm Bore KA5570
LA SLEEVE
$149.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5570, designed for precision and durability. This high-quality replacement sleeve ensures optimal performance and longevity, making it an essential upgrade for any engine rebuild. Experience...09310157- SKU:
- 09310157
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- ENGINE TYPE:
- 2-STROKE
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1988-1990 Kawasaki KX80 KA5041
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5041, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and enhances the longevity of your cylinders, making it an essential component...09310325- SKU:
- 09310325
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 48.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$117.95 -
LA SLEEVE Cylinder Sleeve for Harley-Davidson 1984-1998 Models FL5374
LA SLEEVE
$143.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5374, designed to restore performance and extend the life of worn cylinders. Crafted with precision and durability in mind, this replacement sleeve ensures a perfect fit and optimal function,...09310644- SKU:
- 09310644
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- BORE SIZE METRIC:
- 104.00 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- CHROME-MOLY ALLOY
- UNITS:
- EACH
- COLOR/FINISH:
- ALUMINUM
- DISPLACEMENT:
- 722 CC
- RIDING STYLE:
- STREET
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
$143.95Qty in Cart: 0Quantity:Price:$143.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Kawasaki KX250F 2009-2016 LAS-5611K-1
LA SLEEVE
$375.95Elevate your Kawasaki's performance with the LA SLEEVE Sleeve and Piston Kit, designed for optimal power and efficiency. This comprehensive top-end rebuild kit features advanced materials and engineering to enhance compression, torque, and horsepower...09310519- SKU:
- 09310519
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$375.95Qty in Cart: 0Quantity:Price:$375.95Subtotal: -
LA Sleeve Cylinder Sleeve for Honda XR400R 1996-2004 H5293
LA SLEEVE
$111.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5293, designed to restore performance and extend the lifespan of your cylinders. Crafted from high-quality materials, these sleeves provide a reliable solution for engine repairs, ensuring...H5293- SKU:
- H5293
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$111.95 -
LA Sleeve Cylinder Sleeve 72mm Bore Polaris Trail Blazer 250 1990-2006 FL5168
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5168, designed to restore performance and extend the lifespan of your old cylinders. Crafted with precision, these high-quality replacement sleeves ensure a perfect fit and enhanced durability,...FL5168- SKU:
- FL5168
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- ALUMINUM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- CI
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$148.95 -
LA Sleeve Cylinder Sleeve Yamaha YZ250 1996 YA5296
LA SLEEVE
$148.95High-Performance Replacement Cylinder Sleeves - YA5296 Revitalize your engine with our top-tier replacement cylinder sleeves, engineered to restore performance and enhance durability. Crafted from premium materials, these sleeves provide a seamless fit...YA5296- SKU:
- YA5296
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Big Bore Cylinder Sleeve for Honda TRX400EX 1999-2008 H5445
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5445, designed for superior performance and durability. This high-quality replacement sleeve rejuvenates old cylinders, ensuring optimal fit and functionality. Engineered for precision, it...09310054- SKU:
- 09310054
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- BORE SIZE METRIC:
- 88.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- BIG BORE
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris ACE 900 EPS 2016 60004-K02
CYLINDER WORKS
MSRP: $1,060.95Now: $954.86Was: $1,060.95Upgrade your engine with the CYLINDER WORKS Standard Bore Cylinder, designed for seamless installation and superior performance. This ready-to-install solution features a perfect match with OEM specifications, ensuring a reliable fit and exceptional...09310734- SKU:
- 09310734
- Availability:
- Ships Same Business Day
- Weight:
- 9.91 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 93,00 MM
- DISPLACEMENT:
- STANDARD
- RIDING STYLE:
- UTV
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
MSRP: $1,060.95Now: $954.86Was: $1,060.95Qty in Cart: 0Quantity:Price:MSRP: $1,060.95Now: $954.86Was: $1,060.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2015-2016 60004
CYLINDER WORKS
MSRP: $672.95Now: $605.66Was: $672.95Upgrade your engine with the CYLINDER WORKS Cylinder Standard 60004, designed for effortless installation and optimal performance. This high-quality, direct bolt-on cylinder matches the aesthetics of OEM cylinders while providing superior durability...09310733- SKU:
- 09310733
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER:
- 93,00 MM
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
MSRP: $672.95Now: $605.66Was: $672.95Qty in Cart: 0Quantity:Price:MSRP: $672.95Now: $605.66Was: $672.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit Yamaha YZ85 2002-2018 103.5cc 21007-K01
CYLINDER WORKS
MSRP: $885.95Now: $797.36Was: $885.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for easy installation, this kit offers a seamless fit with no need for re-plating, ensuring your bike runs smoothly and efficiently. With high-quality components...09310346- SKU:
- 09310346
- Availability:
- Ships Same Business Day
- Weight:
- 3.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.2:1
- ENGINE TYPE:
- 2-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 103.5 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- CYLINDER DIAMETER:
- 52,50 MM
- OVERBORE METRIC:
- +5.00 MM
MSRP: $885.95Now: $797.36Was: $885.95Qty in Cart: 0Quantity:Price:MSRP: $885.95Now: $797.36Was: $885.95Subtotal: -
On Sale
Cylinder Works Suzuki RM-Z250 2010-2012 Standard Bore Cylinder Kit 40004-K01
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $704.95Experience unparalleled performance and reliability with the CYLINDER WORKS Cylinder Kit Standard 40004-K01. Designed as a direct bolt-on replacement, this ready-to-install kit ensures a seamless fit and exceptional durability without the need for...09310343- SKU:
- 09310343
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
MSRP: $704.95Now: $634.46Was: $704.95 -
On Sale
Cylinder Works Kawasaki KX250F 2009 Standard Bore Cylinder Kit 30004-K01
CYLINDER WORKS
MSRP: $679.95Now: $611.96Was: $679.95Experience enhanced performance and reliability with the Cylinder Works Cylinder Kit. This ready-to-install, direct bolt-on solution is designed to seamlessly replace your OEM cylinders, ensuring a perfect fit without the need for re-plating. Each kit...09310277- SKU:
- 09310277
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
MSRP: $679.95Now: $611.96Was: $679.95 -
On Sale
ATHENA Cylinder Kit - YZ250F - 83mm P400485100012
ATHENA
MSRP: $1,142.95Now: $1,029.00Was: $1,142.95Kits 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 required09310024- SKU:
- 09310024
- Availability:
- Ships Same Business Day
- Weight:
- 3.68 LBS
- DISPLACEMENT:
- 290 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 83.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,142.95Now: $1,029.00Was: $1,142.95Qty in Cart: 0Quantity:Price:MSRP: $1,142.95Now: $1,029.00Was: $1,142.95Subtotal:
