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!
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- Price
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On Sale
ATHENA Cylinder Kit - DRZ/KFX P400510100001
ATHENA
MSRP: $772.95Now: $696.00Was: $772.95Stock cylinder limits your engine's potential, especially if you're running higher compression or extended operating hours. The ATHENA Cylinder Kit delivers measurable gains in peak power and reliability through precision engineering and materials...09310015- SKU:
- 09310015
- Availability:
- Ships Same Business Day
- Weight:
- 4.71 LBS
- BORE SIZE METRIC:
- 90.00 MM
- MATERIAL:
- ALUMINUM
- STYLE:
- STOCK BORE
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CYLINDER KIT
- DISPLACEMENT:
- 400 CC
MSRP: $772.95Now: $696.00Was: $772.95 -
On Sale
ATHENA Cylinder Kit - KX125 - 54mm P400250100001
ATHENA
MSRP: $970.95Now: $874.00Was: $970.95The ATHENA Cylinder Kit delivers the displacement and thermal management your KX125 needs to compete at the highest levels. A larger 54mm bore paired with advanced nickel-carbide coating and optimized water jackets ensures consistent performance in...09310012- SKU:
- 09310012
- Availability:
- Ships Same Business Day
- Weight:
- 6.18 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CYLINDER KIT
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STOCK BORE
MSRP: $970.95Now: $874.00Was: $970.95 -
WSM Cylinder Kit - Yamaha 010-6029K
WSM
$766.42The WSM Cylinder Kit 010-6029K delivers OEM-matched performance and reliability without compromise. Whether you're rebuilding after a race season or restoring your engine to factory specifications, this kit ensures precise fitment and durability across...09310530- SKU:
- 09310530
- Availability:
- Ships Same Business Day
- Weight:
- 7.81 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NIKASIL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$766.42 -
Pro Circuit Stainless Steel Power Valve for Kawasaki KX85 2002-2013 PVK01085
PRO CIRCUIT
$229.95If you're running a KX85 and want measurable gains in low-end acceleration without sacrificing top-end power, a quality power valve upgrade is one of the highest-ROI modifications available. The Pro Circuit PVK01085 optimizes exhaust port timing to...09310477- SKU:
- 09310477
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- POWER VALVE
$229.95 -
MOOSE RACING Cylinder - Standard - KX85 MSE30009
MOOSE RACING
$467.95If your KX85 has suffered cylinder damage or excessive wear, a factory-spec replacement is essential to restore compression, ring sealing, and overall engine performance. The MOOSE RACING cylinder delivers OEM-equivalent bore geometry and durability...09310623- SKU:
- 09310623
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- UNITS:
- EACH
$467.95 -
On Sale
Cylinder Works Standard Bore Cylinder for Kawasaki KX85 2006-2013 30009
CYLINDER WORKS
MSRP: $543.95Now: $489.56Was: $543.95A worn or damaged cylinder directly compromises your KX85's power delivery and throttle response. The Cylinder Works Standard Bore Cylinder delivers OEM-spec performance without the downtime of traditional re-plating, getting you back on the track or...09310580- SKU:
- 09310580
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-CYCLE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $543.95Now: $489.56Was: $543.95 -
LA Sleeve Cylinder Sleeve 1993 Suzuki RM125 FL5181
LA SLEEVE
$131.95If your RM125's cylinder is worn, scored, or has lost compression, a cylinder sleeve is your path to restored performance without a complete engine teardown. The LA SLEEVE FL5181 restores your bore to proper specifications, allowing you to recondition...FL5181- SKU:
- FL5181
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$131.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2019 10010-K02
CYLINDER WORKS
MSRP: $421.95Now: $379.76Was: $421.95Your Honda CRF450R's cylinder endures constant thermal stress and high-RPM wear—a worn or damaged cylinder compromises compression, power delivery, and overall engine reliability. The Cylinder Works Standard Bore Cylinder Kit delivers a direct bolt-on...09310712- SKU:
- 09310712
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
MSRP: $421.95Now: $379.76Was: $421.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit CRF 450 R 2017-2018 11010-K01
CYLINDER WORKS
MSRP: $886.95Now: $798.26Was: $886.95If you're looking to unlock genuine performance gains from your CRF 450 R without compromise, the Cylinder Works Big Bore Kit delivers measurable improvements in displacement, combustion efficiency, and engine longevity. This bolt-on upgrade eliminates...09310715- SKU:
- 09310715
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- STANDARD
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 99,00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $886.95Now: $798.26Was: $886.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 50007-K01
CYLINDER WORKS
MSRP: $888.95Now: $800.06Was: $888.95If your 2016-2018 KTM 350 SX-F is showing signs of wear—loss of compression, increased blow-by, or declining power delivery—a fresh cylinder kit is the most direct path to restoring race-ready performance. Cylinder Works delivers a ready-to-install...09310721- SKU:
- 09310721
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- CYLINDER DIAMETER:
- 88,00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
MSRP: $888.95Now: $800.06Was: $888.95 -
On Sale
Cylinder Works Yamaha YFM700R Raptor 2006-2014 Standard Bore Cylinder Kit 20004-K01
CYLINDER WORKS
MSRP: $842.95Now: $758.66Was: $842.95When your YFM700R's original cylinder shows signs of wear or you're ready to unlock additional displacement, the Cylinder Works Standard Bore Kit delivers a complete, bolt-on solution without requiring machine work. This matched-component...09310379- SKU:
- 09310379
- Availability:
- Ships Same Business Day
- Weight:
- 8.34 LBS
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- CYLINDER DIAMETER:
- 102,00 MM
- CYLINDER DIAMETER METRIC:
- 102.00 MM
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 686 CC
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
MSRP: $842.95Now: $758.66Was: $842.95 -
On Sale
Cylinder Works Standard Bore Cylinder KTM 65 SX 2009-2022 50005
CYLINDER WORKS
MSRP: $631.95Now: $568.76Was: $631.95Upgrade your engine with the Cylinder Works Standard 50005, a high-performance, ready-to-install direct bolt-on cylinder. Engineered for durability and precision, this cylinder offers a seamless fit and exceptional longevity, ensuring your machine...09311015- SKU:
- 09311015
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- ENGINE TYPE:
- 2-CYCLE
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 45,00 MM
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
MSRP: $631.95Now: $568.76Was: $631.95 -
LA Sleeve Cylinder Sleeve for Kawasaki KDX200 1995-2006 KA5252
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5252, designed to restore performance and extend the life of your cylinders. Crafted with precision and durability in mind, this replacement sleeve ensures optimal fit and function for a...KA5252- SKU:
- KA5252
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.00 MM
- COLOR/FINISH:
- CHROME
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
$131.95 -
LA Sleeve Cylinder Sleeve Kawasaki KX-450F 2008-2010 KA5307
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5307, designed for exceptional performance and durability. This high-quality replacement sleeve ensures a perfect fit, allowing your old cylinders to regain their original functionality...KA5307- SKU:
- KA5307
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
$131.95 -
LA Sleeve Cylinder Sleeve for 1990-1991 Honda CR250R H5105
LA SLEEVE
$148.95The LA SLEEVE Cylinder Sleeve H5105 is designed to rejuvenate your engine's performance by providing a high-quality replacement for worn-out cylinder sleeves. Engineered for durability and precision, this product ensures a perfect fit and optimal...H5105- SKU:
- H5105
- 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
$153.95 -
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 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2015-2016 60004
CYLINDER WORKS
MSRP: $672.95Now: $605.66Was: $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
MSRP: $672.95Now: $605.66Was: $672.95 -
On Sale
Cylinder Works Suzuki RM-Z250 2010-2012 Standard Bore Cylinder Kit 40004-K01
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $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
MSRP: $704.95Now: $634.46Was: $704.95
