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 Cylinder Kit Standard 66mm Bore 11.7:1 Compression Honda CRF150R 2007-2009 10004-K01
CYLINDER WORKS
$509.95Enhance your engine's performance with the Cylinder Works Cylinder Kit, designed for effortless installation and superior durability. This complete kit includes everything you need to achieve optimal engine efficiency without the hassle of re-plating,...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
$509.95 -
ATHENA Cylinder Kit - YZ125 - 58mm P400485100029
ATHENA
$1,223.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310258- 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
$1,223.95 -
ATHENA Cylinder Kit - WR250R/X - 83mm P400485100032
ATHENA
$1,352.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310252- 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
$1,352.95 -
ATHENA Cylinder Kit - SX65 - 50mm P400270100002
ATHENA
$872.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310245- 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
$872.95 -
Cylinder Works Big Bore Kit Yamaha YZ450F 2006-2009 WR450F 2007-2015 21003-K01
CYLINDER WORKS
$808.95Enhance your engine's performance with the CYLINDER WORKS Big Bore Kit, designed for easy installation and superior durability. This ready-to-install kit features OEM-like aesthetics and is engineered for optimal power and reduced noise, ensuring a...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
$808.95 -
Cylinder Works Big Bore Cylinder Kit for Honda CRF250R 2004-2009 2012-2013 CRF250X 2004-2017 11001-K01
CYLINDER WORKS
$696.95Enhance your engine's performance with the Cylinder Works Big Bore Kit 11001-K01. Designed for easy installation, this kit provides a seamless upgrade without the need for re-plating. Experience improved longevity and reduced noise with our premium...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
$696.95 -
ATHENA Cylinder Kit - RMZ450 - 100mm P400510100006
ATHENA
$1,156.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310114- 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
$1,156.95 -
ATHENA Cylinder Kit - KX125 - 58mm P400250100011
ATHENA
$1,201.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310109- 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
$1,201.95 -
ATHENA Cylinder Kit - KX65 - 50mm P400250100007
ATHENA
$932.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310107- 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
$932.95 -
ATHENA Cylinder Kit - YZ125 - 54mm P400485100017
ATHENA
$1,110.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310095- SKU:
- 09310095
- Availability:
- Ships Same Business Day
- Weight:
- 5.60 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
$1,110.95 -
ATHENA Cylinder Kit - Yamaha 070200
ATHENA
$262.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310077- 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
$262.95 -
ATHENA Cylinder Kit - Yamaha/Malaguti 070100
ATHENA
$262.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310076- 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
$262.95 -
ATHENA Cylinder Kit - YZ250F - 83mm P400485100012
ATHENA
$1,142.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310024- SKU:
- 09310024
- Availability:
- Ships Same Business Day
- Weight:
- 3.68 LBS
- DISPLACEMENT:
- 290 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 83.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$1,142.95Qty in Cart: 0Quantity:Price:$1,142.95Subtotal: -
ATHENA Cylinder Kit - KLX/DRZ/KFX/LTZ400 P400510100002
ATHENA
$1,117.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310016- SKU:
- 09310016
- Availability:
- Ships Same Business Day
- Weight:
- 4.95 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
$1,117.95 -
ATHENA Cylinder Kit - DRZ/KFX P400510100001
ATHENA
$772.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310015- 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
$772.95 -
ATHENA Cylinder Kit - KX125 - 54mm P400250100001
ATHENA
$970.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09310012- 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
$970.95 -
WSM Cylinder Kit - Yamaha 010-6029K
WSM
$729.92Exact OEM replica, Nikasil bore plating, High strength, heat-resistant alloy valve with safety link, Moly-coated piston kit with wrist pin clips, High-quality Japanese rings exceed OEM, Kit includes 1 cylinder, 1 piston kit and 1 power valve09310530- SKU:
- 09310530
- Availability:
- Ships Same Business Day
- Weight:
- 7.80 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NIKASIL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$729.92 -
On Sale
Pro Circuit Stainless Steel Power Valve for Kawasaki KX85 2002-2013 PVK01085
PRO CIRCUIT
MSRP: $229.95Now: $202.36Was: $229.95Unlock the full potential of your engine with the PRO CIRCUIT Power Valve PVK01085. Designed to optimize exhaust flow, this high-performance valve enhances bottom-end torque while maintaining peak horsepower. Crafted from durable billet stainless steel,...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
MSRP: $229.95Now: $202.36Was: $229.95
