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
-
On Sale
ATHENA Cylinder Kit - RMZ450 - 100mm P400510100006
ATHENA
MSRP: $1,156.95Now: $1,041.00Was: $1,156.95The ATHENA Cylinder Kit delivers measurable gains in displacement and compression for the RMZ450, translating directly to increased horsepower and throttle response. The nickel-carbide coated aluminum cylinder and molybdenum-coated forged piston are...09310114- SKU:
- 09310114
- Availability:
- Ships Same Business Day
- Weight:
- 3.73 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 490 CC
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $1,156.95Now: $1,041.00Was: $1,156.95 -
On Sale
ATHENA Cylinder Kit - KX125 - 58mm P400250100011
ATHENA
MSRP: $1,201.95Now: $1,082.00Was: $1,201.95The ATHENA Cylinder Kit delivers the displacement and reliability your KX125 demands when stock limits won't cut it. With a 58mm bore, optimized water jacket design, and factory-grade coatings, you're getting race-proven engineering that bolts straight...09310109- SKU:
- 09310109
- Availability:
- Ships Same Business Day
- Weight:
- 5.62 LBS
- BORE SIZE METRIC:
- 58.00 MM
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,201.95Now: $1,082.00Was: $1,201.95 -
On Sale
ATHENA Cylinder Kit - KX65 - 50mm P400250100007
ATHENA
MSRP: $932.95Now: $840.00Was: $932.95If you're pushing your KX65 to its limits, a worn or compromised cylinder is a bottleneck you can't afford. The ATHENA Cylinder Kit delivers measurable gains in compression consistency and heat dissipation, translating directly to more responsive...09310107- SKU:
- 09310107
- Availability:
- Ships Same Business Day
- Weight:
- 3.31 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 80 CC
- BORE SIZE METRIC:
- 50.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
MSRP: $932.95Now: $840.00Was: $932.95 -
On Sale
ATHENA Cylinder Kit - YZ125 - 54mm P400485100017
ATHENA
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95The ATHENA Cylinder Kit delivers the displacement and reliability your YZ125 needs to stay competitive on the track. With a larger 54mm bore and premium coatings engineered for durability, this kit provides measurable power gains while maintaining the...09310095- SKU:
- 09310095
- Availability:
- Ships Same Business Day
- Weight:
- 5.61 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CYLINDER KIT
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STOCK BORE
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95 -
On Sale
ATHENA Cylinder Kit - Yamaha 070200
ATHENA
MSRP: $262.95Now: $237.00Was: $262.95Restore your Yamaha's peak performance with a complete cylinder kit engineered for reliability and longevity. The ATHENA 070200 combines a reinforced aluminum cylinder with advanced thermal management and a forged piston designed to handle sustained...09310077- SKU:
- 09310077
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- DISPLACEMENT:
- 70 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 47.66 MM
- MATERIAL:
- ALUMINUM
MSRP: $262.95Now: $237.00Was: $262.95Qty in Cart: 0Quantity:Price:MSRP: $262.95Now: $237.00Was: $262.95Subtotal: -
On Sale
ATHENA Cylinder Kit - Yamaha/Malaguti 070100
ATHENA
MSRP: $262.95Now: $237.00Was: $262.95When you're ready to unlock serious performance gains on your Yamaha or Malaguti 070, a quality cylinder kit is non-negotiable. The ATHENA Cylinder Kit delivers the displacement and durability you need to maximize horsepower and torque without...09310076- SKU:
- 09310076
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- UNITS:
- KIT
- DISPLACEMENT:
- 70 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- BORE SIZE METRIC:
- 47.66 MM
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- ALUMINUM
MSRP: $262.95Now: $237.00Was: $262.95Qty in Cart: 0Quantity:Price:MSRP: $262.95Now: $237.00Was: $262.95Subtotal: -
On Sale
ATHENA Cylinder Kit - KLX/DRZ/KFX/LTZ400 P400510100002
ATHENA
MSRP: $1,117.95Now: $1,006.00Was: $1,117.95Stock cylinder limitations can compromise peak horsepower and throttle response on your KLX, DRZ, KFX, or LTZ400. The ATHENA Cylinder Kit delivers measurable gains through advanced materials and thermal engineering—larger water jackets keep temperatures...09310016- SKU:
- 09310016
- Availability:
- Ships Same Business Day
- Weight:
- 4.96 LBS
- DISPLACEMENT:
- 435 CC
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 94.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,117.95Now: $1,006.00Was: $1,117.95 -
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
$543.95If 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
$543.95Qty in Cart: 0Quantity:Price:$543.95Subtotal: -
MOOSE RACING Cylinder - Standard - Honda MSE10010
MOOSE RACING
$390.95A worn or damaged cylinder directly compromises compression, power delivery, and engine reliability—especially in high-demand racing and performance applications. The MOOSE RACING Cylinder restores OEM specifications with superior durability and thermal...09310972- SKU:
- 09310972
- Availability:
- Ships Same Business Day
- Weight:
- 3.11 LBS
- BORE SIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$390.95Qty in Cart: 0Quantity:Price:$390.95Subtotal: -
LA Sleeve Cylinder Sleeve for 2004 Honda CR125R 54mm Bore H5568
LA SLEEVE
$127.95When your CR125R's cylinder wall shows signs of wear—loss of compression, increased blow-by, and declining power delivery—a quality sleeve restores original performance without requiring a full engine replacement. The LA SLEEVE H5568 is...09310059- SKU:
- 09310059
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- TYPE:
- AC
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1997-2005 Kawasaki KDX220R 69mm Bore KA5319
LA SLEEVE
$131.95If your KDX220R is showing signs of worn cylinder walls—loss of compression, increased blowby, or sluggish throttle response—a cylinder sleeve is often the most cost-effective way to restore performance without a complete engine rebuild. The LA Sleeve...09310083- SKU:
- 09310083
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 69.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$131.95 -
LA Sleeve Cylinder Sleeve for Honda XR-650L 1993-2023 H5160
LA SLEEVE
$131.95If your XR-650L is showing signs of blow-by, loss of compression, or rough idle, a worn cylinder is likely the culprit. The LA Sleeve H5160 restores your engine to factory specifications without requiring a full engine replacement, saving you significant...09310151- SKU:
- 09310151
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 100.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- EACH
$131.95 -
LA Sleeve Cylinder Rebuild Kit for 1998-2000 Kawasaki KX80 LAS-5351K
LA SLEEVE
$312.95If your KX80 is showing signs of wear—loss of compression, reduced ring seal, or sluggish power delivery—a top-end rebuild is the most cost-effective way to restore factory performance or exceed it. The LA Sleeve Cylinder Rebuild Kit delivers a complete...09310384- SKU:
- 09310384
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- CAST
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
LA Sleeve Cylinder Sleeve for 2001 Kawasaki KX125 KA5451
LA SLEEVE
$131.95Cylinder wear is inevitable on high-mileage two-strokes, but a degraded bore doesn't mean engine replacement. The LA Sleeve Cylinder Sleeve KA5451 restores your KX125's original bore geometry and compression integrity, bringing back the crisp throttle...KA5451- SKU:
- KA5451
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 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
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
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:
