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
-
Cylinder Works Big Bore Cylinder Kit for Suzuki RM-Z250 2013-2018 41004-K02
CYLINDER WORKS
$799.95If you're running a 2013-2018 RM-Z250, a big bore cylinder kit is one of the most cost-effective ways to unlock measurable gains in displacement and power without a complete engine rebuild. The Cylinder Works Big Bore Kit delivers bolt-on simplicity...09310501- SKU:
- 09310501
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
$799.95 -
Cylinder Works Standard Bore Cylinder Kit KTM 65 SX 2009-2023 50005-K01
CYLINDER WORKS
$788.95When your KTM 65 SX starts showing signs of wear, a proper cylinder refresh is the most cost-effective way to restore lost compression and power. The Cylinder Works Standard Bore Kit eliminates guesswork by pairing a precision-machined cylinder with...09310500- SKU:
- 09310500
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 2.09:1
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 45,00 MM
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- ENGINE TYPE:
- 2-CYCLE
- UNITS:
- KIT
- DISPLACEMENT:
- 65 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
$788.95 -
Cylinder Works Standard Bore Cylinder Kit 2013-2015 KTM 350 SX-F 350 XC-F 50003-K01
CYLINDER WORKS
$867.95When your KTM 350 SX-F or XC-F's cylinder wears beyond acceptable limits, a quality replacement isn't optional—it's essential to maintaining peak compression, throttle response, and engine longevity. The Cylinder Works Standard Bore Kit delivers...09310497- SKU:
- 09310497
- Availability:
- Ships Same Business Day
- Weight:
- 3.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- CYLINDER DIAMETER:
- 88,00 MM
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- DISPLACEMENT:
- 350 CC
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$867.95Qty in Cart: 0Quantity:Price:$867.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for 2013-2015 KTM 350 SX-F 35003-K01
CYLINDER WORKS
$982.95If you're running a 2013-2015 KTM 350 SX-F, this big bore kit delivers measurable gains in displacement and power without requiring extensive machine work or re-plating. The bolt-on design means you'll be back on the track or trail quickly, while the...09310495- SKU:
- 09310495
- Availability:
- Ships Same Business Day
- Weight:
- 3.70 LBS
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 90,00 MM
- DISPLACEMENT:
- 365 CC
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
$982.95Qty in Cart: 0Quantity:Price:$982.95Subtotal: -
Cylinder Works Yamaha YZ 450 F 2010-2013 High Compression Cylinder Kit 21005-K01
CYLINDER WORKS
$901.95Stock YZ 450F cylinders sacrifice durability and peak performance for cost savings. The Cylinder Works High Compression Kit restores the power and reliability your engine demands, delivering measurable gains in combustion efficiency and ring seal without...09310354- SKU:
- 09310354
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 468 CC
- STYLE:
- HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER:
- 99,00 MM
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$901.95 -
Cylinder Works Standard Bore Cylinder Kit 77mm 13.4:1 Compression Suzuki RM-Z250 2007-2009 40003-K01
CYLINDER WORKS
$704.95If you're running a 2007-2009 RM-Z250 and want genuine performance gains without the headache of machine work, this Cylinder Works kit delivers a straightforward path to increased displacement and compression. The 77mm bore paired with a 13.4:1...09310352- SKU:
- 09310352
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
$704.95Qty in Cart: 0Quantity:Price:$704.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit 2010-2013 Yamaha YZ450F 20005-K01
CYLINDER WORKS
$804.95If you're running a 2010-2013 YZ450F, a worn or damaged cylinder directly impacts combustion efficiency, power delivery, and engine longevity. The Cylinder Works Standard Bore Kit restores your engine to factory specifications—or better—with matched...09310345- SKU:
- 09310345
- Availability:
- Ships Same Business Day
- Weight:
- 4.58 LBS
- CYLINDER DIAMETER:
- 97,00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-CYCLE
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$804.95 -
Cylinder Works Kawasaki KX250F 2010 Standard Bore Cylinder Kit 77mm 13.2:1 30005-K01
CYLINDER WORKS
$679.95Factory cylinder wear limits piston-to-wall clearance and reduces combustion efficiency—a complete cylinder kit restores your KX250F's compression, throttle response, and ring seal integrity. The Cylinder Works standard bore design delivers proven...09310341- SKU:
- 09310341
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
$679.95 -
Cylinder Works Honda CRF 250R 2010-2017 Big Bore Cylinder Kit 270cc 11007-K01
CYLINDER WORKS
$758.95Stock displacement limits your Honda CRF 250R's potential—this big bore kit unlocks an additional 20cc of swept volume, delivering measurable gains in mid-range torque and top-end power without sacrificing reliability. The bolt-on design means you're...09310340- SKU:
- 09310340
- Availability:
- Ships Same Business Day
- Weight:
- 3.68 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 270 CC
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +3.20 MM
$758.95Qty in Cart: 0Quantity:Price:$758.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit Honda CRF250R 2010-2013 10007-K01
CYLINDER WORKS
$597.95When you're pushing a CRF250R to its limits, factory tolerances become a ceiling, not a target. The Cylinder Works Standard Bore Kit delivers a bolt-on refresh that restores compression, improves ring seal, and eliminates the guesswork of sourcing...09310338- SKU:
- 09310338
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 76,80 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
$597.95 -
On Sale
ATHENA Cylinder Kit - KX250F P400250100013
ATHENA
MSRP: $1,105.30Now: $995.00Was: $1,105.30A worn or damaged cylinder directly compromises your KX250F's power delivery, throttle response, and overall reliability on the track. The ATHENA Cylinder Kit restores factory performance while delivering improved durability through advanced materials...09310308- SKU:
- 09310308
- Availability:
- Ships Same Business Day
- Weight:
- 3.03 LBS
- BORE SIZE METRIC:
- 83.00 MM
- DISPLACEMENT:
- 290 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,105.30Now: $995.00Was: $1,105.30 -
Cylinder Works Standard Bore Cylinder Kit for 2002-2008 Honda CRF450R 10002-K01
CYLINDER WORKS
$651.95The Honda CRF450R demands reliable power delivery, especially if you're logging serious hours at the track or trail. This Cylinder Works kit delivers a complete bolt-on solution with matched Vertex pistons, eliminating guesswork and machine work while...09310272- SKU:
- 09310272
- Availability:
- Ships Same Business Day
- Weight:
- 4.51 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.1:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- STYLE:
- STANDARD
$651.95 -
Cylinder Works Standard Bore Cylinder Kit Honda CRF250R 2008-2009 10001-K02
CYLINDER WORKS
$609.95The Honda CRF250R demands reliable power delivery, and a worn cylinder limits both performance and engine longevity. This Cylinder Works Standard Bore Kit restores your engine to peak efficiency with factory-quality components and Vertex pistons...09310271- SKU:
- 09310271
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- CYLINDER DIAMETER:
- 78,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 78.00 MM
$609.95 -
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2017-2018 10001-K01
CYLINDER WORKS
$597.95Stock cylinder wear limits your CRF450R's potential, whether you're chasing track times or extending engine life on your rebuild. The Cylinder Works Standard Bore Kit delivers a direct bolt-on solution with matched components—no machine work, no...09310270- SKU:
- 09310270
- Availability:
- Ships Same Business Day
- Weight:
- 4.32 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
$597.95 -
Cylinder Works Cylinder Kit Standard 66mm Bore 11.7:1 Compression Honda CRF150R 2007-2009 10004-K01
CYLINDER WORKS
$550.95If you're running a CRF150R and want measurable power gains without the downtime of traditional re-plating, this complete cylinder kit delivers bolt-on simplicity and proven durability. The matched Vertex piston pairing reduces noise and extends ring...09310269- SKU:
- 09310269
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 66.00 MM
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 66,00 MM
- DISPLACEMENT:
- 149 CC
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$550.95 -
On Sale
ATHENA Cylinder Kit - YZ125 - 58mm P400485100029
ATHENA
MSRP: $1,223.95Now: $1,102.00Was: $1,223.95The ATHENA Cylinder Kit for YZ125 delivers measurable performance gains through precision engineering and superior materials. If you're running stock components, you're leaving horsepower on the table—this kit's larger water jackets and advanced coatings...09310258- SKU:
- 09310258
- Availability:
- Ships Same Business Day
- Weight:
- 5.43 LBS
- BORE SIZE METRIC:
- 58.00 MM
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,223.95Now: $1,102.00Was: $1,223.95 -
On Sale
ATHENA Cylinder Kit - WR250R/X - 83mm P400485100032
ATHENA
MSRP: $1,352.95Now: $1,218.00Was: $1,352.95If you're running a WR250R/X and want to unlock genuine displacement gains with measurable power increases, the ATHENA Cylinder Kit delivers the reliability and precision engineering that separates bolted performance from half-measures. This 83mm...09310252- SKU:
- 09310252
- Availability:
- Ships Same Business Day
- Weight:
- 4.29 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 83.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- DISPLACEMENT:
- 290 CC
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
MSRP: $1,352.95Now: $1,218.00Was: $1,352.95Qty in Cart: 0Quantity:Price:MSRP: $1,352.95Now: $1,218.00Was: $1,352.95Subtotal: -
On Sale
ATHENA Cylinder Kit - SX65 - 50mm P400270100002
ATHENA
MSRP: $872.95Now: $786.00Was: $872.95The ATHENA Cylinder Kit for SX65 delivers the displacement and thermal management your 50mm bore demands. With a nickel-carbide coated aluminum cylinder and forged piston engineered for durability, this kit handles aggressive riding without compromise...09310245- SKU:
- 09310245
- Availability:
- Ships Same Business Day
- Weight:
- 3.28 LBS
- DISPLACEMENT:
- 80 CC
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 50.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $872.95Now: $786.00Was: $872.95 -
Cylinder Works Big Bore Kit Yamaha YZ450F 2006-2009 WR450F 2007-2015 21003-K01
CYLINDER WORKS
$873.95If you're running a YZ450F or WR450F and want measurable gains in displacement and power output, a big bore kit is the most efficient path forward. The Cylinder Works Big Bore Kit delivers bolt-on simplicity without sacrificing the reliability and fit of...09310174- SKU:
- 09310174
- Availability:
- Ships Same Business Day
- Weight:
- 4.04 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 478 CC
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- OVERBORE METRIC:
- +3.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$873.95Qty in Cart: 0Quantity:Price:$873.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Honda CRF250R 2004-2009 2012-2013 CRF250X 2004-2017 11001-K01
CYLINDER WORKS
$752.95If you're running a CRF250R or CRF250X and want measurable gains in displacement and power without a complete engine overhaul, the Cylinder Works Big Bore Kit delivers exactly that. This bolt-on upgrade eliminates the guesswork with a matched...09310118- SKU:
- 09310118
- Availability:
- Ships Same Business Day
- Weight:
- 3.03 LBS
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- CYLINDER DIAMETER:
- 81,00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$752.95
