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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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 -
On Sale
Cylinder Works High Compression Cylinder Kit Honda CRF250R 2018-2019 CW10011K01HC
CYLINDER WORKS
MSRP: $664.95Now: $598.46Was: $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
MSRP: $664.95Now: $598.46Was: $664.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit Honda CRF250R 2018-2021 CRF250RX 2019-2021 CW11011K01
CYLINDER WORKS
MSRP: $787.95Now: $709.16Was: $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
MSRP: $787.95Now: $709.16Was: $787.95 -
On Sale
Cylinder Works Standard Bore Cylinder Yamaha YZ450F 2018-2019 CW20012
CYLINDER WORKS
MSRP: $461.95Now: $415.76Was: $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
MSRP: $461.95Now: $415.76Was: $461.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2018-2019 CW20012K01
CYLINDER WORKS
MSRP: $788.95Now: $710.06Was: $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
MSRP: $788.95Now: $710.06Was: $788.95 -
On Sale
Cylinder Works 2019-2020 Yamaha WR 450 F High Compression Big Bore Cylinder Kit CW20012K01HC
CYLINDER WORKS
MSRP: $801.95Now: $721.76Was: $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
MSRP: $801.95Now: $721.76Was: $801.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K02
CYLINDER WORKS
MSRP: $1,120.95Now: $1,008.86Was: $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
MSRP: $1,120.95Now: $1,008.86Was: $1,120.95 -
Cylinder Works High Compression Big Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K01HC
CYLINDER WORKS
$1,218.56If 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
$1,218.56 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2017 Honda CRF250R 10007-K03
CYLINDER WORKS
MSRP: $609.95Now: $548.96Was: $609.95If your 2016-2017 Honda CRF250R is showing signs of wear on the cylinder or you're rebuilding after a top-end failure, a fresh cylinder kit restores compression and throttle response without the guesswork of sourcing individual components. The Cylinder...09310674- SKU:
- 09310674
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- BORE SIZE METRIC:
- 76.80 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 76,80 MM
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- STYLE:
- STANDARD
MSRP: $609.95Now: $548.96Was: $609.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2018 Suzuki RM-Z250 40004-K03
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $704.95If your 2016-2018 RM-Z250 is showing signs of wear—loss of compression, increased blow-by, or worn ring grooves—a cylinder kit refresh is essential to restore peak performance and reliability. The Cylinder Works Standard Bore kit delivers OEM-spec...09310675- SKU:
- 09310675
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.75:1
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
MSRP: $704.95Now: $634.46Was: $704.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Yamaha WR250F 2018-2019 20010-K02
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $750.95When your WR250F's cylinder shows signs of wear—loss of compression, increased blowby, or rough idle—a quality rebuild restores lost power and reliability. The Cylinder Works Standard Bore Kit delivers OEM-spec performance without the fabrication delays...09310676- SKU:
- 09310676
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2017-2019 10010-K01
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $704.95When your CRF450R's cylinder shows wear, a quality replacement is essential to restore compression, throttle response, and engine reliability. The Cylinder Works Standard Bore Kit delivers factory-spec performance without the downtime and cost of custom...09310713- SKU:
- 09310713
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER:
- 96,00 MM
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $704.95Now: $634.46Was: $704.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Honda CRF450R 2017-2018 10010-K01HC
CYLINDER WORKS
MSRP: $773.95Now: $696.56Was: $773.95If you're running a CRF450R in 2017-2018 spec, a high-compression cylinder kit is one of the most direct ways to unlock measurable power gains without major engine work. This Cylinder Works kit delivers a bolt-on solution that respects OEM tolerances...09310714- SKU:
- 09310714
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $773.95Now: $696.56Was: $773.95 -
On Sale
Cylinder Works Standard Bore Cylinder for 2016-2023 KTM 250 SX-F 50006
CYLINDER WORKS
MSRP: $538.95Now: $485.06Was: $538.95If you're running a 2016-2023 KTM 250 SX-F, cylinder wear directly impacts throttle response, compression consistency, and overall engine reliability. The Cylinder Works Standard Bore Cylinder replaces a compromised or worn sleeve with...09310716- SKU:
- 09310716
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER:
- 78,00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $538.95Now: $485.06Was: $538.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2023 Husqvarna FC 250 50006-K01
CYLINDER WORKS
MSRP: $895.95Now: $806.36Was: $895.95Your FC 250's engine demands precision components that deliver both reliability and performance—this Cylinder Works kit is engineered to meet those demands. By replacing worn or damaged cylinder and piston assemblies with OEM-equivalent parts, you'll...09310717- SKU:
- 09310717
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER:
- 78,00 MM
- ENGINE TYPE:
- 4-CYCLE
- BORE SIZE METRIC:
- 78.00 MM
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $895.95Now: $806.36Was: $895.95 -
On Sale
Cylinder Works Cylinder Kit 2021-2022 Gas Gas MC 250F 2021-2022 Gas Gas EX 250F 2016-2022 Husqvarna FC 250 2016-2022 KTM 250 SX-F 2016-2022 KTM 250 XC-F 2015-2016 KTM 250 SX-F FE 50006-K01HC
CYLINDER WORKS
MSRP: $920.95Now: $828.86Was: $920.95Factory cylinders wear out—piston slap increases, compression drops, and efficiency suffers. The Cylinder Works 50006-K01HC restores your 250F's engine performance with a direct bolt-on replacement that matches OEM fitment while delivering superior...09310718- SKU:
- 09310718
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.7:1
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
MSRP: $920.95Now: $828.86Was: $920.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit 270cc 2016-2022 KTM 250 SX-F 51006-K01
CYLINDER WORKS
MSRP: $1,037.95Now: $934.16Was: $1,037.95A 270cc big bore kit transforms your 2016-2022 KTM 250 SX-F from a competitive machine into a dominant force on the track. Cylinder Works engineered this kit specifically to deliver measurable power gains without requiring engine teardown or custom...09310719- SKU:
- 09310719
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- ENGINE TYPE:
- 4-CYCLE
- DISPLACEMENT:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 81,00 MM
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,037.95Now: $934.16Was: $1,037.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit Kawasaki KX250F 2017-2018 31012-K01
CYLINDER WORKS
MSRP: $810.95Now: $729.86Was: $810.95If you're running a 2017-2018 Kawasaki KX250F, a big bore cylinder kit is one of the most direct paths to measurable power gains without a complete engine rebuild. The Cylinder Works Big Bore Kit delivers increased displacement and improved airflow...09310724- SKU:
- 09310724
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
MSRP: $810.95Now: $729.86Was: $810.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX450F 2013-2014 30011-K02
CYLINDER WORKS
MSRP: $690.95Now: $621.86Was: $690.95When your KX450F's original cylinder starts showing wear, a quality replacement isn't just about maintaining stock performance—it's about reclaiming the precision and reliability your bike demands. The Cylinder Works Standard Bore Kit delivers a...09310598- SKU:
- 09310598
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $690.95Now: $621.86Was: $690.95 -
On Sale
Cylinder Works Standard Bore Cylinder for Polaris RZR 800 2008-2014 60002
CYLINDER WORKS
MSRP: $635.95Now: $572.36Was: $635.95Your Polaris RZR 800's cylinder is the foundation of reliable power delivery—and when it shows wear, performance suffers. The Cylinder Works Standard Bore Cylinder restores OEM-level durability without the downtime of sourcing a replacement or paying for...09310604- SKU:
- 09310604
- Availability:
- Ships Same Business Day
- Weight:
- 7.85 LBS
- CYLINDER DIAMETER:
- 80,00 MM
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- PRODUCT NAME:
- CYLINDER
MSRP: $635.95Now: $572.36Was: $635.95
