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 Suzuki LT250R 1988-1992 FL5064
LA SLEEVE
$148.95When cylinder wear compromises compression and power delivery, a quality sleeve restoration becomes essential for reliable performance. The LA SLEEVE FL5064 restores your Suzuki LT250R's original bore dimensions, eliminating blow-by and revitalizing...FL5064- SKU:
- FL5064
- Availability:
- Ships Same Business Day
- Weight:
- 2.19 LBS
- BORE SIZE METRIC:
- 67.00 MM
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- CS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 1989-1990 Suzuki RM250 RMX250 67mm Bore FL5093
LA SLEEVE
$153.95If you're rebuilding a 1989-1990 RM250 or RMX250, a worn cylinder is the bottleneck preventing peak performance. The LA SLEEVE FL5093 restores compression and sealing integrity, giving you the reliability needed for serious riding or racing. This...FL5093- SKU:
- FL5093
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$153.95 -
L.A. Sleeve Cylinder Sleeve 47.50mm Bore Suzuki RM80 1991-2001 FL5140
LA SLEEVE
$117.95A worn cylinder sleeve compromises compression, increases blow-by, and robs your RM80 of power and efficiency. The L.A. Sleeve FL5140 restores your engine to factory specifications with a precision-engineered replacement that handles the demands of trail...FL5140- SKU:
- FL5140
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- BORE SIZE METRIC:
- 47.50 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
L.A. Sleeve Cylinder Sleeve for Suzuki RM-250 1991-1993 FL5182
LA SLEEVE
$153.95A worn cylinder wall compromises combustion efficiency, power output, and fuel economy—problems that multiply quickly in a high-revving two-stroke like the RM-250. The L.A. Sleeve FL5182 restores your cylinder to factory specifications, eliminating...FL5182- SKU:
- FL5182
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 67.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$153.95Qty in Cart: 0Quantity:Price:$153.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Kawasaki KX85 2014-2019 LAS5778K
LA SLEEVE
$326.95When your Kawasaki KX85 starts losing compression and power, a worn top-end compromises both reliability and lap times. The LA Sleeve Sleeve and Piston Kit restores your engine to peak efficiency with a centrifugally spun-cast iron bore that delivers...09310861- SKU:
- 09310861
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- SLEEVE AND PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$326.95 -
Cylinder Works Standard Bore Cylinder KTM 50 SX 2009-2023 CW50012
CYLINDER WORKS
$434.95When your KTM 50 SX's cylinder shows signs of wear—scored walls, compression loss, or damaged plating—a quality replacement is essential to restore engine integrity and performance. The Cylinder Works Standard Bore cylinder delivers OEM-equivalent...09311022- SKU:
- 09311022
- Availability:
- Ships Same Business Day
- Weight:
- 2.61 LBS
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 39,50 MM
- ENGINE TYPE:
- 2-CYCLE
- STYLE:
- STANDARD
$434.95 -
Cylinder Works Standard Bore Cylinder for Polaris RZR 900 2017-2020 CW60007
CYLINDER WORKS
$696.95When your Polaris RZR 900 cylinder shows wear or you're rebuilding after hard use, OEM replacement costs and lead times can sideline your rig. The Cylinder Works Standard Bore CW60007 delivers a direct bolt-on solution without the expense and hassle of...09311023- SKU:
- 09311023
- Availability:
- Ships Same Business Day
- Weight:
- 7.16 LBS
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 93,00 MM
- PRODUCT NAME:
- CYLINDER
$696.95 -
Cylinder Works Yamaha WR250F 2018-2019 High Compression Cylinder Kit 20010-K02HC
CYLINDER WORKS
$750.95If you're running a WR250F, factory displacement limits your peak performance and torque delivery. The Cylinder Works high-compression big bore kit unlocks additional cubic centimeters and compression ratio, delivering measurable power gains while...09310709- SKU:
- 09310709
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
$750.95 -
Cylinder Works Standard Bore Cylinder Kit for 2007-2008 Honda CRF450R 10002-K02
CYLINDER WORKS
$651.95Stock CRF450R cylinders wear, lose compression, and rob you of the power you've built. The Cylinder Works Standard Bore Kit restores your engine to original specifications while delivering the durability and reliability you need for consistent track...09310839- SKU:
- 09310839
- Availability:
- Ships Same Business Day
- Weight:
- 4.71 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 12.1:1
$651.95 -
Cylinder Works Big Bore Cylinder Kit for Honda CRF450R 2007-2019 10002-K02HC
CYLINDER WORKS
$690.95If you're running a Honda CRF450R, factory displacement limits your peak power output when you're pushing hard on the track or trail. The Cylinder Works Big Bore Kit removes that constraint with a straightforward bolt-on upgrade that delivers measurable...09310841- SKU:
- 09310841
- Availability:
- Ships Same Business Day
- Weight:
- 4.71 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
$690.95 -
Cylinder Works Standard Bore Cylinder Kit Arctic Cat 400 DVX 2004-2008 40001-K02
CYLINDER WORKS
$717.95If your Arctic Cat 400 DVX is experiencing bore wear or you're looking to restore factory performance, the Cylinder Works Standard Bore Cylinder Kit delivers a complete, bolt-on solution without the downtime of machine work or re-plating. This matched...09310842- SKU:
- 09310842
- Availability:
- Ships Same Business Day
- Weight:
- 5.16 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 90,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.3:1
- DISPLACEMENT:
- 400 CC
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
$717.95 -
Cylinder Works Standard Bore High Compression Cylinder Kit for 2004-2008 Arctic Cat 400 DVX 40001-K02HC
CYLINDER WORKS
$716.95If you're running a 2004-2008 Arctic Cat 400 DVX and want measurable gains in displacement and compression ratio without extensive machine work, this Cylinder Works kit delivers a bolt-on solution. The matched Vertex pistons and Nickel Silicon Carbide...09310843- SKU:
- 09310843
- Availability:
- Ships Same Business Day
- Weight:
- 5.16 LBS
- DISPLACEMENT:
- 400 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 90,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$716.95 -
Cylinder Works Standard Bore Cylinder Kit for 2018-2019 Honda CRF250R CW10011K01
CYLINDER WORKS
$622.95If you're running a 2018-2019 CRF250R, this cylinder kit delivers a direct path to increased displacement and responsive power without the downtime of custom machine work. The matched Vertex piston and Nickel Silicon Carbide plating work together to...09310845- SKU:
- 09310845
- Availability:
- Ships Same Business Day
- Weight:
- 3.46 LBS
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER:
- 79,00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 79.00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$622.95 -
Cylinder Works High Compression Cylinder Kit Honda CRF250R 2018-2019 CW10011K01HC
CYLINDER WORKS
$664.95The CRF250R demands more power to stay competitive on the track or trail, and the Cylinder Works High Compression Cylinder Kit delivers exactly that without requiring expensive machine work or downtime. This bolt-on big bore kit increases displacement...09310846- SKU:
- 09310846
- Availability:
- Ships Same Business Day
- Weight:
- 3.41 LBS
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 79.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.6:1
- CYLINDER DIAMETER:
- 79,00 MM
$664.95 -
Cylinder Works Big Bore Cylinder Kit Honda CRF250R 2018-2021 CRF250RX 2019-2021 CW11011K01
CYLINDER WORKS
$787.95Stock Honda CRF250R and CRF250RX cylinders limit your engine's potential and wear faster under aggressive riding conditions. This Cylinder Works big bore kit adds displacement and durability without requiring machine work or re-plating—just bolt it on...09310847- SKU:
- 09310847
- Availability:
- Ships Same Business Day
- Weight:
- 3.16 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 270 CC
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 82,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 82.00 MM
$787.95 -
Cylinder Works Standard Bore Cylinder Yamaha YZ450F 2018-2019 CW20012
CYLINDER WORKS
$461.95Stock cylinders wear down over time, reducing compression, power delivery, and overall engine reliability—especially under racing or high-performance conditions. The Cylinder Works Standard Bore Cylinder gives you a factory-spec replacement with superior...09310848- SKU:
- 09310848
- Availability:
- Ships Same Business Day
- Weight:
- 3.31 LBS
- PRODUCT NAME:
- CYLINDER
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
$461.95 -
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2018-2019 CW20012K01
CYLINDER WORKS
$788.95Worn cylinder walls and piston wear rob your YZ450F of compression, throttle response, and reliability. The Cylinder Works Standard Bore Kit restores your engine to factory specifications with matched components and precision machining—eliminating...09310849- SKU:
- 09310849
- Availability:
- Ships Same Business Day
- Weight:
- 4.56 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER DIAMETER:
- 97,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
$788.95 -
Cylinder Works 2019-2020 Yamaha WR 450 F High Compression Big Bore Cylinder Kit CW20012K01HC
CYLINDER WORKS
$801.95If you're running a 2019-2020 WR 450F and want measurable power gains without extensive machine work, this big bore kit delivers real displacement increases that translate directly to torque and acceleration. The ready-to-install design means you're not...09310850- SKU:
- 09310850
- Availability:
- Ships Same Business Day
- Weight:
- 4.51 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 97,00 MM
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-CYCLE
$801.95 -
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K02
CYLINDER WORKS
$1,120.95Your Polaris RZR 900's factory cylinder is reliable, but a properly engineered replacement kit unlocks measurable gains in durability, consistency, and longevity. If you're running higher hours, increased boost pressure, or simply want a fresh,...09310852- SKU:
- 09310852
- Availability:
- Ships Same Business Day
- Weight:
- 10.11 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 93,00 MM
- DISPLACEMENT:
- 875 CC
- RIDING STYLE:
- UTV
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
$1,120.95 -
Cylinder Works High Compression Big Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K01HC
CYLINDER WORKS
$1,110.95If you're running a Polaris RZR 900 and want measurable gains in displacement and compression ratio without extensive machine work, the Cylinder Works High Compression Big Bore Kit delivers the displacement increase and reliability you need. This bolt-on...09310853- SKU:
- 09310853
- Availability:
- Ships Same Business Day
- Weight:
- 10.01 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 875 CC
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 93,00 MM
- RIDING STYLE:
- UTV
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
$1,110.95
