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 54mm Honda CR125R 2002 H5466
LA SLEEVE
$127.95If your CR125R is losing compression, bogging on acceleration, or showing signs of cylinder wear, a fresh sleeve restores the sealed bore surface that two-stroke performance demands. The LA SLEEVE H5466 gives you a cost-effective alternative to sourcing...H5466- SKU:
- H5466
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 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
$127.95 -
LA Sleeve Cylinder Sleeve Honda CR250R 2002 2003 H5477
LA SLEEVE
$148.95A worn cylinder bore is the silent killer of two-stroke performance—compression drops, blow-by increases, and your engine bleeds power. The LA SLEEVE Cylinder Sleeve H5477 restores your Honda CR250R to OEM specifications without the expense of a complete...H5477- SKU:
- H5477
- Availability:
- Ships Same Business Day
- Weight:
- 1.14 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
$148.95 -
On Sale
Cylinder Works Standard Bore Cylinder Yamaha YZ250F 2014-2018 20010
CYLINDER WORKS
MSRP: $434.95Now: $391.46Was: $434.95A worn or damaged cylinder compromises combustion efficiency and power delivery on your YZ250F. The Cylinder Works Standard Bore Cylinder restores your bike to peak performance with a ready-to-install replacement that eliminates downtime and re-plating...09310579- SKU:
- 09310579
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
MSRP: $434.95Now: $391.46Was: $434.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for 2015-2023 Kawasaki KVF750 Brute Force 4x4i 860cc 31007-K02
CYLINDER WORKS
MSRP: $609.95Now: $548.96Was: $609.95If you're running a KVF750 Brute Force and want measurable power gains without extensive machine work, this big bore kit delivers. The matched Vertex pistons and nickel silicon carbide cylinder plating ensure reliability under sustained high-load...09310583- SKU:
- 09310583
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER:
- 76,80 MM
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
MSRP: $609.95Now: $548.96Was: $609.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2014-2017 20005-K02
CYLINDER WORKS
MSRP: $804.95Now: $724.46Was: $804.95The stock cylinder on your YZ450F experiences wear that directly impacts power delivery and throttle response. This Cylinder Works kit restores—or exceeds—OEM performance with fresh Nickel Silicon Carbide plating and matched Vertex pistons, all without...09310585- SKU:
- 09310585
- Availability:
- Ships Same Business Day
- Weight:
- 4.55 LBS
- CYLINDER DIAMETER:
- 97,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $804.95Now: $724.46Was: $804.95 -
On Sale
Cylinder Works YZ 250 1999-2024 Standard Bore Cylinder Kit 20009-K01
CYLINDER WORKS
MSRP: $842.95Now: $758.66Was: $842.95When your YZ 250's cylinder shows signs of wear—scoring, reduced compression, or lost power—a full rebuild with quality components is the most cost-effective path back to peak performance. The Cylinder Works Standard Bore Kit delivers everything you need...09310587- SKU:
- 09310587
- Availability:
- Ships Same Business Day
- Weight:
- 7.35 LBS
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $842.95Now: $758.66Was: $842.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Honda CRF250R 2008-2009 10001-K02HC
CYLINDER WORKS
MSRP: $645.95Now: $581.36Was: $645.95When your Honda CRF250R is ready for more power, a high-compression cylinder kit is one of the most effective bolt-on upgrades available. This Cylinder Works kit delivers measurable gains in peak power and mid-range torque without requiring custom...09310290- SKU:
- 09310290
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- HIGH COMPRESSION
MSRP: $645.95Now: $581.36Was: $645.95 -
LA Sleeve Cylinder Rebuild Kit for 2000-2006 Honda TRX350TE FourTrax Rancher ES LAS-5443K
LA SLEEVE
$312.95When your Honda TRX350TE Rancher's top-end starts losing compression and efficiency, a quality rebuild kit is the most cost-effective way to restore original performance—or exceed it. The LA Sleeve Cylinder Rebuild Kit delivers a complete solution with a...09310356- SKU:
- 09310356
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$312.95 -
LA Sleeve Cylinder Sleeve 85mm Bore Honda TRX400FA 2004-2007 H5630
LA SLEEVE
$117.95A worn cylinder bore reduces compression, kills power output, and forces you to rebuild or replace the entire engine. The LA Sleeve H5630 restores your TRX400FA to factory specifications without the expense of a complete engine replacement. This...09310371- SKU:
- 09310371
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$117.95 -
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
$117.95 -
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 -
On Sale
Cylinder Works Standard Bore Cylinder KTM 50 SX 2009-2023 CW50012
CYLINDER WORKS
MSRP: $434.95Now: $391.46Was: $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
MSRP: $434.95Now: $391.46Was: $434.95 -
On Sale
Cylinder Works Standard Bore Cylinder for Polaris RZR 900 2017-2020 CW60007
CYLINDER WORKS
MSRP: $696.95Now: $627.26Was: $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
MSRP: $696.95Now: $627.26Was: $696.95 -
On Sale
Cylinder Works Yamaha WR250F 2018-2019 High Compression Cylinder Kit 20010-K02HC
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $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
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for 2007-2008 Honda CRF450R 10002-K02
CYLINDER WORKS
MSRP: $651.95Now: $586.76Was: $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
MSRP: $651.95Now: $586.76Was: $651.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Honda CRF450R 2007-2019 10002-K02HC
CYLINDER WORKS
MSRP: $690.95Now: $621.86Was: $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
MSRP: $690.95Now: $621.86Was: $690.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Arctic Cat 400 DVX 2004-2008 40001-K02
CYLINDER WORKS
MSRP: $717.95Now: $646.16Was: $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
MSRP: $717.95Now: $646.16Was: $717.95 -
On Sale
Cylinder Works Standard Bore High Compression Cylinder Kit for 2004-2008 Arctic Cat 400 DVX 40001-K02HC
CYLINDER WORKS
MSRP: $716.95Now: $645.26Was: $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
MSRP: $716.95Now: $645.26Was: $716.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for 2018-2019 Honda CRF250R CW10011K01
CYLINDER WORKS
MSRP: $622.95Now: $560.66Was: $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
MSRP: $622.95Now: $560.66Was: $622.95
