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
-
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
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
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
$148.95A worn or damaged cylinder sleeve compromises compression, increases blow-by, and accelerates piston ring wear—ultimately robbing your YZ250 of power and reliability. This LA Sleeve replacement restores your engine's original bore geometry and sealing...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
$117.95If your TRX400EX is showing signs of cylinder wear—loss of compression, blow-by, or hard starting—a sleeve replacement restores factory performance without the cost of a full engine rebuild. The LA SLEEVE H5445 is precision-engineered for the Honda...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
$117.95 -
Cylinder Works Standard Bore Cylinder Kit for Polaris ACE 900 EPS 2016 60004-K02
CYLINDER WORKS
$1,060.95When your Polaris ACE 900 EPS starts showing signs of wear or you're looking to restore factory performance, a quality cylinder kit is essential. The Cylinder Works Standard Bore Cylinder eliminates guesswork with a direct bolt-on design and OEM-matched...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
$1,060.95Qty in Cart: 0Quantity:Price:$1,060.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2015-2016 60004
CYLINDER WORKS
$672.95The stock cylinder in your Polaris RZR 900 can wear rapidly under aggressive riding conditions, leading to power loss and increased friction. The Cylinder Works Standard Bore Cylinder Kit restores your engine's original geometry while upgrading to a...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
$672.95 -
Cylinder Works Big Bore Cylinder Kit Yamaha YZ85 2002-2018 103.5cc 21007-K01
CYLINDER WORKS
$885.95If you're running a stock YZ85, you're leaving performance on the table. This big bore kit delivers a measurable increase in displacement and power output without requiring machine work or custom fabrication—just bolt it on and ride. With matched Vertex...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
$885.95Qty in Cart: 0Quantity:Price:$885.95Subtotal: -
Cylinder Works Suzuki RM-Z250 2010-2012 Standard Bore Cylinder Kit 40004-K01
CYLINDER WORKS
$704.95When your RM-Z250 cylinder shows signs of wear—scoring, loss of compression, or increased blow-by—a factory replacement often means sending your engine out for expensive machine work and re-plating. The Cylinder Works Standard Bore Kit eliminates that...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
$704.95 -
Cylinder Works Kawasaki KX250F 2009 Standard Bore Cylinder Kit 30004-K01
CYLINDER WORKS
$679.95A worn or damaged cylinder compromises both power delivery and reliability—especially critical on a high-strung 250F that demands precision. This bolt-on Cylinder Works kit restores your engine to peak performance without the downtime and expense of...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
$679.95 -
On Sale
ATHENA Cylinder Kit - YZ250F - 83mm P400485100012
ATHENA
MSRP: $1,142.95Now: $1,029.00Was: $1,142.95If you're running a YZ250F at the edge of its limits, a worn or damaged cylinder is a performance killer that demands immediate attention. The ATHENA Cylinder Kit gives you OEM-quality reliability with genuine performance upgrades—nickel-carbide coating...09310024- 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:
