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 Kawasaki KX250 2002-2003 66.40mm Bore KA5471
LA SLEEVE
$148.95When your KX250's cylinder wall begins to show signs of wear, a cylinder sleeve restores lost compression and ring sealing without a complete engine replacement. The LA SLEEVE KA5471 is precision-engineered to Kawasaki's exact specifications, giving you...KA5471- SKU:
- KA5471
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 66.40mm Bore Honda CR250R 2001 H5448
LA SLEEVE
$148.95A worn cylinder sleeve compromises compression, increases blowby, and degrades throttle response—exactly why a precision replacement matters on your CR250R. The LA SLEEVE H5448 restores factory bore specifications, eliminating the performance loss that...H5448- SKU:
- H5448
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- BORE SIZE METRIC:
- 66.40 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
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 Sleeve and Piston Kit Honda TRX400FW Foreman 1995-2003 LAS-5286K
LA SLEEVE
$340.95If your Honda TRX400FW Foreman is showing signs of wear—loss of compression, declining power output, or rough idle—a top-end rebuild is the most cost-effective way to restore peak performance. The LA SLEEVE Sleeve and Piston Kit delivers a complete,...09310357- SKU:
- 09310357
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$340.95Qty in Cart: 0Quantity:Price:$340.95Subtotal: -
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 -
LA Sleeve Cylinder Sleeve 77mm Bore Yamaha YZ250F 2004-2013 WR250F 2004-2013 YA5536
LA SLEEVE
$108.95A worn cylinder bore directly kills engine compression, throttle response, and fuel efficiency—problems that compound quickly in high-stress riding conditions. The LA SLEEVE YA5536 restores your YZ250F or WR250F to factory specifications by replacing the...09310265- SKU:
- 09310265
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal: -
LA Sleeve Cylinder Rebuild Kit for 2005-2007 Honda CR85R CR85RB Expert LAS-5599K
LA SLEEVE
$312.95When your Honda CR85R or CR85RB's top-end starts losing compression and power, a sleeve and piston kit is the most cost-effective path to full engine restoration. The LA Sleeve Moly2000 design delivers superior ring seal and durability compared to...09310382- SKU:
- 09310382
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- MATERIAL:
- CAST
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Honda CRF450R 2019 10010-K02
CYLINDER WORKS
MSRP: $677.95Now: $610.16Was: $677.95If you're running a stock Honda CRF450R cylinder, you're leaving performance and reliability on the table. The Cylinder Works Standard Bore Kit delivers a complete, bolt-on refresh that restores your engine to peak efficiency while eliminating the...09310840- SKU:
- 09310840
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
MSRP: $677.95Now: $610.16Was: $677.95Qty in Cart: 0Quantity:Price:MSRP: $677.95Now: $610.16Was: $677.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit for Polaris General 1000 2017-2019 61006-K01
CYLINDER WORKS
MSRP: $1,309.95Now: $1,178.96Was: $1,309.95If you're running a Polaris General 1000 and want measurable power gains without engine teardown, the Cylinder Works Big Bore Kit delivers displacement and compression in one bolt-on package. The nickel silicon carbide plating eliminates the need for...09310844- SKU:
- 09310844
- Availability:
- Ships Same Business Day
- Weight:
- 9.65 LBS
- DISPLACEMENT:
- 1110 CC
- RIDING STYLE:
- UTV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $1,309.95Now: $1,178.96Was: $1,309.95Qty in Cart: 0Quantity:Price:MSRP: $1,309.95Now: $1,178.96Was: $1,309.95Subtotal: -
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 Cylinder Kit Husqvarna FC 350 2016-2018 50007-K01HC
CYLINDER WORKS
MSRP: $834.95Now: $751.46Was: $834.95A worn or damaged cylinder compromises your FC 350's power delivery and reliability—especially in competitive or high-mileage applications. The Cylinder Works kit delivers a complete, precision-engineered solution with matched Vertex pistons, eliminating...09310722- SKU:
- 09310722
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- CYLINDER DIAMETER:
- 88,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- STYLE:
- STANDARD
MSRP: $834.95Now: $751.46Was: $834.95Qty in Cart: 0Quantity:Price:MSRP: $834.95Now: $751.46Was: $834.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 366cc 14.0:1 Compression 90mm 51007-K01
CYLINDER WORKS
MSRP: $866.95Now: $780.26Was: $866.95If you're running a 2016-2018 KTM 350 SX-F and want measurable gains in peak power and mid-range response without a complete engine rebuild, this big bore kit delivers. By stepping displacement from stock to 366cc with a matched piston package, you'll...09310723- SKU:
- 09310723
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- CYLINDER DIAMETER:
- 90,00 MM
- DISPLACEMENT:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- BIG BORE
MSRP: $866.95Now: $780.26Was: $866.95Qty in Cart: 0Quantity:Price:MSRP: $866.95Now: $780.26Was: $866.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2014-2017 21005-K02
CYLINDER WORKS
MSRP: $834.95Now: $751.46Was: $834.95The stock cylinder in your 2014-2017 YZ450F limits your engine's potential—this big bore kit unlocks measurable horsepower and torque gains while maintaining reliability. By increasing displacement without requiring custom machine work, you gain the...09310590- SKU:
- 09310590
- Availability:
- Ships Same Business Day
- Weight:
- 4.40 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 468 CC
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- CYLINDER DIAMETER:
- 99,00 MM
MSRP: $834.95Now: $751.46Was: $834.95Qty in Cart: 0Quantity:Price:MSRP: $834.95Now: $751.46Was: $834.95Subtotal: -
On Sale
Cylinder Works Big Bore Cylinder Kit for Yamaha WR250F 2015-2019 21010-K01
CYLINDER WORKS
MSRP: $771.95Now: $694.76Was: $771.95If you're serious about maximizing your WR250F's potential, a big bore cylinder kit is one of the most direct paths to measurable power gains. The Cylinder Works Big Bore Kit delivers increased displacement without requiring extensive engine work—the...09310591- SKU:
- 09310591
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER:
- 80,00 MM
MSRP: $771.95Now: $694.76Was: $771.95Qty in Cart: 0Quantity:Price:MSRP: $771.95Now: $694.76Was: $771.95Subtotal: -
On Sale
Cylinder Works Rear Cylinder Kit Kawasaki KVF750 Brute Force 2015-2020 30008-K02
CYLINDER WORKS
MSRP: $639.95Now: $575.96Was: $639.95If you're running a Kawasaki KVF750 Brute Force, cylinder wear directly impacts power delivery, fuel efficiency, and overall reliability. The Cylinder Works Rear Cylinder Kit restores your engine to factory specifications—or beyond—with matched...09310611- SKU:
- 09310611
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 85.00 MM
- PRODUCT NAME:
- REAR CYLINDER KIT
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 85,00 MM
- DISPLACEMENT:
- 749 CC
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
MSRP: $639.95Now: $575.96Was: $639.95Qty in Cart: 0Quantity:Price:MSRP: $639.95Now: $575.96Was: $639.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR XP 1000 2014-2015 60003-K02
CYLINDER WORKS
MSRP: $1,093.95Now: $984.56Was: $1,093.95When your RZR XP 1000 demands more power and reliability, a worn or damaged cylinder becomes the bottleneck to peak performance. The Cylinder Works Standard Bore Kit delivers a direct bolt-on solution that restores your engine to factory...09310618- SKU:
- 09310618
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- CYLINDER DIAMETER:
- 93,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 999 CC
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
MSRP: $1,093.95Now: $984.56Was: $1,093.95Qty in Cart: 0Quantity:Price:MSRP: $1,093.95Now: $984.56Was: $1,093.95Subtotal: -
On Sale
Cylinder Works CRF 450 R 2013-2016 Standard Bore Cylinder Kit 10006-K02
CYLINDER WORKS
MSRP: $717.95Now: $646.16Was: $717.95When your CRF 450 R's original cylinder shows signs of wear—scoring, loss of compression, or increased blow-by—a quality rebuild kit is your path back to reliable power delivery. The Cylinder Works Standard Bore Kit gives you a complete, bolt-on solution...09310489- SKU:
- 09310489
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $717.95Now: $646.16Was: $717.95Qty in Cart: 0Quantity:Price:MSRP: $717.95Now: $646.16Was: $717.95Subtotal: -
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
