Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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Cylinder Works 76mm Standard Bore Cylinder Kit for 2005-2012 KTM 250 SX-F 50002-K01
CYLINDER WORKS
$829.95Experience unmatched performance and reliability with the CYLINDER WORKS Cylinder Kit. Designed as a direct bolt-on replacement, these kits offer a hassle-free installation while maintaining the high standards of OEM quality. Each kit is engineered for...09310408- SKU:
- 09310408
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER DIAMETER METRIC:
- 76.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 76,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
$829.95 -
Cylinder Works Honda CRF450X 2005-2017 Standard Bore Cylinder Kit 10008-K01
CYLINDER WORKS
$615.95Upgrade your engine with the Cylinder Works Cylinder Kit, designed for seamless installation and optimal performance. This high-quality kit features components that mirror OEM specifications, ensuring a perfect fit and exceptional durability. With...09310274- SKU:
- 09310274
- Availability:
- Ships Same Business Day
- Weight:
- 4.65 LBS
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.1:1
- ENGINE TYPE:
- 4-CYCLE
$615.95 -
Cylinder Works Standard Bore Cylinder Kit for 2005-2007 Yamaha YZ250F 20002-K02
CYLINDER WORKS
$669.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for seamless installation and optimal performance. This kit features high-quality components that mirror OEM specifications, ensuring a reliable fit and enhanced durability. Experience...09310279- SKU:
- 09310279
- Availability:
- Ships Same Business Day
- Weight:
- 3.95 LBS
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
$669.95 -
Cylinder Works Yamaha YZ450F 2003-2005 WR450F 2003-2006 Cylinder Kit 20001-K02
CYLINDER WORKS
$694.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for seamless installation and optimal performance. This kit provides all the essential components, ensuring a perfect fit and enhanced durability, making it an excellent choice for both...09310280- SKU:
- 09310280
- Availability:
- Ships Same Business Day
- Weight:
- 4.33 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 95,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
$694.95 -
Cylinder Works Honda CRF450R 2002-2008 High Compression Cylinder Kit 10002-K01HC
CYLINDER WORKS
$652.95Elevate your engine's performance with the CYLINDER WORKS High Compression Cylinder Kit. Designed for seamless installation, this kit combines OEM-like aesthetics with advanced engineering for enhanced durability and efficiency. Experience a boost in...09310291- SKU:
- 09310291
- Availability:
- Ships Same Business Day
- Weight:
- 4.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- UNITS:
- KIT
- STYLE:
- HIGH COMPRESSION
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
$652.95 -
Cylinder Works Standard Bore Cylinder Honda CRF150R 2007-2018 10004
CYLINDER WORKS
$328.95Experience unmatched performance and reliability with the CYLINDER WORKS Cylinder Standard 10004. Designed for seamless installation, these cylinders are engineered to meet or exceed OEM specifications, offering a perfect fit and exceptional durability...09310163- SKU:
- 09310163
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.00 MM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 66,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 66.00 MM
- STYLE:
- STANDARD
$328.95 -
Cylinder Works Big Bore Cylinder Kit 269cc 2004-2008 Kawasaki KX250F 31001-K01
CYLINDER WORKS
$731.95Elevate your engine's performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for seamless installation, this kit offers a perfect blend of durability and efficiency, ensuring your ride delivers power and smooth operation. Each component is...09310120- SKU:
- 09310120
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- OVERBORE METRIC:
- +3.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- DISPLACEMENT:
- 269 CC
- STYLE:
- BIG BORE
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
$731.95 -
Cylinder Works Standard Bore Cylinder for Honda CRF250R 2004-2009 10001
CYLINDER WORKS
$340.95Experience unmatched performance with the CYLINDER WORKS Standard 10001. This ready-to-install, direct bolt-on cylinder is designed for seamless integration, ensuring your engine runs smoothly without the need for re-plating. Crafted with precision in...09310128- SKU:
- 09310128
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- CYLINDER DIAMETER:
- 78,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$340.95 -
Cylinder Works Big Bore Gasket Kit 2010-2022 Suzuki RM-Z250 80.00mm Bore 41004-G01
CYLINDER WORKS
$63.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 41004-G01. This ready-to-install kit features high-quality components that ensure a perfect fit and enhanced durability, allowing you to experience improved power and...09342151- SKU:
- 09342151
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- PRODUCT NAME:
- GASKET KIT
$63.95 -
On Sale
Cylinder Works Big Bore Gasket Kit 81mm Bore 2013-2015 KTM 250 SX-F 51004-G01
CYLINDER WORKS
MSRP: $128.95Now: $84.00Was: $128.95Enhance your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 51004-G01. This ready-to-install kit offers a seamless upgrade, featuring components that mirror OEM specifications while delivering superior durability and efficiency...09343130- SKU:
- 09343130
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $128.95Now: $84.00Was: $128.95 -
Cylinder Works Big Bore Gasket Kit Yamaha YZ250F 2014-2018 21010-G01
CYLINDER WORKS
$99.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 21010-G01. This complete kit offers a seamless, direct bolt-on solution that enhances power without the need for extensive modifications. Crafted for durability and efficiency,...09344052- SKU:
- 09344052
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- BIG BORE
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
$99.95 -
On Sale
Cylinder Works Big Bore Gasket Kit Kawasaki KX450F 2009-2015 31011-G01
CYLINDER WORKS
MSRP: $89.95Now: $58.00Was: $89.95Upgrade your engine with the CYLINDER WORKS Big Bore Gasket Kit 31011-G01, designed for effortless installation and enhanced performance. This kit features high-quality components that mirror OEM specifications, ensuring a seamless fit and optimal...09344056- SKU:
- 09344056
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- BIG BORE
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $89.95Now: $58.00Was: $89.95 -
Cylinder Works Honda CRF250R 2009 Cylinder Head Kit CH1001-K01
CYLINDER WORKS
$548.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit CH1001-K01. This high-quality replacement cylinder head is designed for enthusiasts seeking enhanced efficiency and power. Crafted in the U.S.A., it combines precision...09300127- SKU:
- 09300127
- Availability:
- Ships Same Business Day
- Weight:
- 6.20 LBS
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
$548.95 -
Cylinder Works Cylinder Head Kit for 2008 Honda CRF250R CH1002-K01
CYLINDER WORKS
$548.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit CH1002-K01. This high-quality replacement cylinder head is designed for enthusiasts seeking enhanced power and efficiency. Crafted in the U.S.A., it features precision...09300128- SKU:
- 09300128
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$548.95 -
Cylinder Works Cylinder Head Kit Honda CRF250R 2004-2007 CH1003-K01
CYLINDER WORKS
$548.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit CH1003-K01. This high-quality replacement cylinder head is designed for enthusiasts seeking enhanced power and efficiency. Crafted in the U.S.A., it combines advanced engineering...09300129- SKU:
- 09300129
- Availability:
- Ships Same Business Day
- Weight:
- 6.30 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
$548.95 -
Cylinder Works YZ250 1999-2024 Cylinder Head Kit CH2001-K01
CYLINDER WORKS
$243.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit CH2001-K01. This precision-engineered replacement cylinder head is designed to enhance airflow and optimize combustion, making it perfect for enthusiasts looking to boost their...09300130- SKU:
- 09300130
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- OFF-ROAD
$243.95 -
Cylinder Works High Compression Cylinder Kit 2003-2005 Honda CRF250R 10007-K02HC
CYLINDER WORKS
$589.95Upgrade your engine's performance with our High Compression Cylinder Kit, designed for effortless installation and optimal efficiency. This ready-to-install, direct bolt-on solution mimics the original equipment manufacturer (OEM) cylinders while...09310584- SKU:
- 09310584
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.1:1
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- HIGH COMPRESSION
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 76,80 MM
- CYLINDER DIAMETER METRIC:
- 76.80 MM
$589.95 -
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX250F 2015-2016 30006-K02
CYLINDER WORKS
$629.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for seamless installation and optimal performance. This high-quality kit features components that mirror OEM specifications, ensuring reliability and durability for your motorcycle. With...09310592- SKU:
- 09310592
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
$629.95 -
Cylinder Works Standard Bore Cylinder Kit for Kawasaki KX450F 2009-2012 30011-K01
CYLINDER WORKS
$627.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for easy installation and optimal performance. This complete kit includes everything you need for a seamless replacement, ensuring your engine runs smoothly and efficiently. With...09310596- SKU:
- 09310596
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
$627.95 -
Cylinder Works Kawasaki KX450F 2015 Standard Bore Cylinder Kit 30011-K03
CYLINDER WORKS
$639.95Upgrade your engine with the Cylinder Works Cylinder Kit, designed for seamless installation and superior performance. This ready-to-install kit features OEM-like aesthetics and comes equipped with high-quality Vertex pistons for enhanced durability and...09310600- SKU:
- 09310600
- Availability:
- Ships Same Business Day
- Weight:
- 4.20 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
$639.95
