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
-
MOOSE RACING Cylinder - Standard - CRF250 MSECW10011
MOOSE RACING
$338.95When your CRF250 cylinder shows signs of wear—scoring, compression loss, or thermal stress—a direct OEM replacement restores the reliability and performance your engine demands. This MOOSE RACING cylinder delivers factory-spec precision without the...09310878- SKU:
- 09310878
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
$338.95 -
MOOSE RACING Cylinder - Standard MSE20005
MOOSE RACING
$506.95A worn or damaged cylinder directly compromises combustion efficiency, heat management, and overall engine reliability. The MOOSE RACING Cylinder delivers OEM-equivalent performance with superior durability, ensuring consistent bore tolerances and a...09310454- SKU:
- 09310454
- Availability:
- Ships Same Business Day
- Weight:
- 3.43 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$506.95 -
MOOSE RACING Cylinder - Standard MSE30001
MOOSE RACING
$380.95A worn or damaged cylinder compromises compression, increases friction, and accelerates wear on your piston rings and bearings. The MOOSE RACING MSE30001 restores OEM-spec performance with a durable, precision-machined replacement that dissipates heat...09310456- SKU:
- 09310456
- Availability:
- Ships Same Business Day
- Weight:
- 2.48 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$380.95 -
MOOSE RACING Cylinder - Standard MSE30006
MOOSE RACING
$390.95A worn or damaged cylinder compromises compression, throttle response, and overall engine reliability—especially under racing conditions where tolerances matter. The MOOSE RACING MSE30006 replaces your OEM cylinder with precision-engineered durability,...09310459- SKU:
- 09310459
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$390.95 -
MOOSE RACING Cylinder - Standard MSE40001
MOOSE RACING
$407.95A worn or damaged cylinder is a bottleneck that compromises your entire engine's performance and reliability. The MOOSE RACING MSE40001 restores your engine to factory specifications with precision engineering and premium materials, giving you the...09310460- SKU:
- 09310460
- Availability:
- Ships Same Business Day
- Weight:
- 3.84 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$407.95 -
MOOSE RACING Cylinder - Standard - FC250 MSE50006
MOOSE RACING
$498.95A worn or damaged cylinder directly compromises engine performance, throttle response, and overall reliability. The MOOSE RACING Cylinder restores your FC250 to OEM specifications with precision-machined tolerances and a low-friction bore surface that...09310879- SKU:
- 09310879
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
$498.95 -
MOOSE RACING Cylinder - Standard MSE50002
MOOSE RACING
$487.95A worn or damaged cylinder compromises compression, throttle response, and overall engine reliability—especially under high-load conditions. The MOOSE RACING Standard Cylinder restores your engine to OEM performance specifications with a precision-honed...09310465- SKU:
- 09310465
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$487.95 -
MOOSE RACING Cylinder - Standard MSECW20014
MOOSE RACING
$390.95A worn or damaged cylinder directly compromises compression, heat management, and overall engine reliability—making replacement essential for consistent performance. The MOOSE RACING Standard Cylinder delivers OEM-spec precision without compromise,...09310969- SKU:
- 09310969
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 97,00 MM
- BORE SIZE METRIC:
- STANDARD
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- UNITS:
- EACH
$390.95 -
LA Sleeve Cylinder Sleeve 54mm Bore Suzuki RM125 2004-2007 FL5532
LA SLEEVE
$127.95When your RM125's cylinder shows signs of wear—scoring, pitting, or loss of compression—a quality sleeve restores your engine to factory spec without requiring a complete cylinder replacement. The LA SLEEVE FL5532 is precision-engineered for the...09310040- SKU:
- 09310040
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$127.95 -
LA Sleeve Cylinder Sleeve 45mm Bore 2003-2008 KTM 65 SX FL5550
LA SLEEVE
$117.95A worn or damaged cylinder sleeve compromises compression, reduces power output, and accelerates further engine wear—ultimately shortening your 2003-2008 KTM 65 SX's lifespan. The LA SLEEVE FL5550 restores your engine to factory compression standards,...09310042- SKU:
- 09310042
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$117.95 -
LA Sleeve Cylinder Sleeve 54mm Bore Honda CR125R 1987-1988 H5001
LA SLEEVE
$137.95A worn cylinder sleeve compromises compression, sealing, and overall engine reliability—critical issues in competitive two-stroke racing where every horsepower and consistency matters. The LA SLEEVE H5001 is a precision-engineered replacement that...09310047- SKU:
- 09310047
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$137.95 -
LA Sleeve Cylinder Sleeve for Yamaha YFZ450 2004-2013 YA5495
LA SLEEVE
$127.95A worn cylinder compromises compression, power output, and fuel efficiency—especially critical on high-performance machines like the YFZ450. The LA SLEEVE Cylinder Sleeve YA5495 restores your engine to original specifications without requiring a full...09310070- SKU:
- 09310070
- Availability:
- Ships Same Business Day
- Weight:
- 1.59 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$127.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX250F 2017-2019 30012-K02
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $704.95Your KX250F's stock cylinder will eventually wear—piston blow-by, lost compression, and increased friction are inevitable. The Cylinder Works Standard Bore Kit restores your engine to peak efficiency with OEM-matched specifications and Vertex pistons...09310727- SKU:
- 09310727
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- 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 KX 250 F 2017-2019 Standard Bore High Compression Cylinder Kit 30012-K02HC
CYLINDER WORKS
MSRP: $773.95Now: $696.56Was: $773.95Factory cylinder wear reduces compression and robs your KX 250 F of peak power delivery. This Cylinder Works kit restores lost performance with matched Vertex pistons and nickel silicon carbide plating that outlasts OEM components. Bolt-on installation...09310729- SKU:
- 09310729
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
MSRP: $773.95Now: $696.56Was: $773.95 -
LA Sleeve Cylinder Sleeve 66.40mm Bore Suzuki RM250 2003 FL5494
LA SLEEVE
$148.95A worn or damaged cylinder sleeve kills engine performance and reliability. The LA SLEEVE FL5494 restores your RM250's cylinder integrity with precision engineering, delivering the power and durability you need for consistent track or trail performance...09310147- SKU:
- 09310147
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- EACH
$148.95 -
LA Sleeve Honda CR250R 1999-2000 Cylinder Rebuild Kit LAS-5375K
LA SLEEVE
$422.95If you're rebuilding a Honda CR250R top-end, you need a sleeve and piston kit that restores—or exceeds—original compression and ring seal. The LA Sleeve kit delivers measurable gains in torque and horsepower by pairing a centrifugally-spun Moly2000...09310413- SKU:
- 09310413
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- MATERIAL:
- CAST
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$422.95 -
LA Sleeve Sleeve and Piston Kit Yamaha YZ125 1999-2000 LAS-5378K
LA SLEEVE
$360.95A worn or damaged top-end compromises compression, throttle response, and overall engine reliability on your YZ125. The LA Sleeve Sleeve and Piston Kit restores your 2-stroke's performance with a complete rebuild solution, delivering renewed horsepower,...09310419- SKU:
- 09310419
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- IRON
$360.95 -
LA Sleeve Cylinder Sleeve Kawasaki KX125 2000 KA5429
LA SLEEVE
$131.95If you're rebuilding a KX125 engine or restoring a worn cylinder, a quality sleeve is non-negotiable—it restores bore integrity and sealing while eliminating the cost of a full cylinder replacement. The LA SLEEVE KA5429 is engineered for precision fit...KA5429- SKU:
- KA5429
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
$131.95 -
LA Sleeve Cylinder Sleeve Kawasaki KX125 2002 KA5473
LA SLEEVE
$131.95A worn cylinder loses compression and efficiency, directly impacting throttle response and overall engine reliability. The LA SLEEVE Cylinder Sleeve KA5473 restores your Kawasaki KX125's original performance by providing a precision-fit replacement that...KA5473- SKU:
- KA5473
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$131.95 -
LA Sleeve Cylinder Sleeve for 2001 Honda CR125R H5450
LA SLEEVE
$127.95Your CR125R's cylinder is the heart of engine performance—when it wears, power drops and reliability suffers. The LA SLEEVE Cylinder Sleeve H5450 restores worn cylinders to like-new condition, giving you precise piston clearance, optimal ring sealing,...H5450- SKU:
- H5450
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
$127.95
