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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
Cylinder Works Standard Bore Cylinder Kit 77mm Bore Kawasaki KX250F 2011-2014 30006-K01
CYLINDER WORKS
MSRP: $666.95Now: $600.26Was: $666.95Upgrade your engine with the CYLINDER WORKS Cylinder Standard 30006-K01, designed for seamless installation and optimal performance. These high-quality, ready-to-install cylinders mirror OEM specifications while enhancing durability and reducing engine...09310423- SKU:
- 09310423
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
MSRP: $666.95Now: $600.26Was: $666.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit CRF 150 R 2012-2024 10004-K02
CYLINDER WORKS
MSRP: $539.95Now: $485.96Was: $539.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit Standard 10004-K02, designed for seamless installation and optimal performance. This high-quality kit offers a perfect fit, ensuring your engine runs smoothly and efficiently without the need for...09310486- SKU:
- 09310486
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 66,00 MM
- DISPLACEMENT:
- 149 CC
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 66.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $539.95Now: $485.96Was: $539.95 -
On Sale
Cylinder Works 270cc Big Bore Cylinder Kit for 2013-2015 KTM 250 SX-F 51004-K01
CYLINDER WORKS
MSRP: $1,011.95Now: $910.76Was: $1,011.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit Standard 51004-K01, designed for seamless installation and exceptional performance. This high-quality kit includes everything you need to enhance your bike's power and efficiency while maintaining...09310491- SKU:
- 09310491
- Availability:
- Ships Same Business Day
- Weight:
- 3.54 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- 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:
- BIG BORE
MSRP: $1,011.95Now: $910.76Was: $1,011.95Qty in Cart: 0Quantity:Price:MSRP: $1,011.95Now: $910.76Was: $1,011.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Honda CRF450R 2009-2016 10006
CYLINDER WORKS
MSRP: $434.95Now: $391.46Was: $434.95Enhance your CRF450R's performance with the CYLINDER WORKS Standard Cylinder. Designed for seamless installation, this direct bolt-on solution eliminates the need for re-plating while delivering durability and reliability. Crafted in the U.S.A., this...09310391- SKU:
- 09310391
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE SIZE METRIC:
- 96.00 MM
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
MSRP: $434.95Now: $391.46Was: $434.95 -
On Sale
Cylinder Works Honda CRF250R 2010-2017 Standard Bore Cylinder 76.8mm 13.2:1 10007
CYLINDER WORKS
MSRP: $407.95Now: $367.16Was: $407.95Upgrade your CRF250R with the Cylinder Works Standard Cylinder, designed for effortless installation and superior performance. This ready-to-install, direct bolt-on cylinder mirrors the quality of OEM parts while enhancing durability and longevity...09310392- SKU:
- 09310392
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE SIZE METRIC:
- 76.80 MM
- CYLINDER DIAMETER:
- 76,80 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
MSRP: $407.95Now: $367.16Was: $407.95 -
On Sale
Cylinder Works Cylinder Standard RMZ250 2007 40003
CYLINDER WORKS
MSRP: $461.95Now: $415.76Was: $461.95Upgrade your RMZ250 with the Cylinder Works Standard Cylinder, designed for seamless installation and optimal performance. Crafted in the U.S.A., this high-quality replacement cylinder offers durability and reliability without the need for re-plating...09310401- SKU:
- 09310401
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
MSRP: $461.95Now: $415.76Was: $461.95 -
On Sale
Cylinder Works Standard Cylinder for Suzuki RM-Z250 2010-2012 40004
CYLINDER WORKS
MSRP: $447.95Now: $403.16Was: $447.95Upgrade your RMZ250 with the Cylinder Works Standard Cylinder, designed for seamless installation and superior performance. Crafted to match OEM specifications, this high-quality cylinder features advanced plating technology for enhanced durability and...09310402- SKU:
- 09310402
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 44.00 MM
- ENGINE TYPE:
- 4-CYCLE
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
MSRP: $447.95Now: $403.16Was: $447.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 350 SX-F 2011-2012 50001-K01
CYLINDER WORKS
MSRP: $867.95Now: $781.16Was: $867.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Kit, designed for easy installation and optimal durability. This ready-to-install kit features components that mirror OEM specifications, ensuring a seamless fit and exceptional...09310406- SKU:
- 09310406
- Availability:
- Ships Same Business Day
- Weight:
- 3.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- DISPLACEMENT:
- 350 CC
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 88,00 MM
- CYLINDER DIAMETER METRIC:
- 88.00 MM
MSRP: $867.95Now: $781.16Was: $867.95 -
On Sale
Cylinder Works 365cc Big Bore Cylinder Kit for 2011-2012 KTM 350 SX-F 350cc 51001-K01
CYLINDER WORKS
MSRP: $982.95Now: $884.66Was: $982.95Experience unparalleled performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for easy installation, this kit offers a seamless fit without the need for re-plating, ensuring your engine runs smoothly and efficiently. Crafted in the U.S.A.,...09310410- SKU:
- 09310410
- Availability:
- Ships Same Business Day
- Weight:
- 3.64 LBS
- DISPLACEMENT:
- 365 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER:
- 90,00 MM
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 90.00 MM
MSRP: $982.95Now: $884.66Was: $982.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit 276cc 2006-2012 KTM 250 SX-F 250 XC-F 250 XCF-W 51002-K01
CYLINDER WORKS
MSRP: $982.95Now: $884.66Was: $982.95Elevate your engine's performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for easy installation, this kit offers a seamless fit with OEM components while enhancing power and efficiency. With high-quality materials and precision...09310411- SKU:
- 09310411
- Availability:
- Ships Same Business Day
- Weight:
- 3.26 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 276 CC
- OVERBORE METRIC:
- +3.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.3:1
- CYLINDER DIAMETER:
- 80,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
MSRP: $982.95Now: $884.66Was: $982.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2002-2008 10006-K01
CYLINDER WORKS
MSRP: $690.95Now: $621.86Was: $690.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit Standard 10006-K01, designed for seamless installation and optimal performance. This ready-to-install kit features high-quality components that mirror the original equipment manufacturer (OEM)...09310273- SKU:
- 09310273
- Availability:
- Ships Same Business Day
- Weight:
- 4.20 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
MSRP: $690.95Now: $621.86Was: $690.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Kawasaki KX250F 2004-2005 and Suzuki RM-Z250 2004-2006 30001-K01
CYLINDER WORKS
MSRP: $686.95Now: $618.26Was: $686.95Elevate your engine's performance with the CYLINDER WORKS Cylinder Kit Standard 30001-K01. This ready-to-install, direct bolt-on kit is designed to seamlessly replace your OEM cylinders, delivering exceptional durability and efficiency. Engineered for...09310275- SKU:
- 09310275
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $686.95Now: $618.26Was: $686.95Qty in Cart: 0Quantity:Price:MSRP: $686.95Now: $618.26Was: $686.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Kawasaki KX250F 2006-2008 30001-K02
CYLINDER WORKS
MSRP: $686.95Now: $618.26Was: $686.95Enhance your engine's performance with the CYLINDER WORKS Cylinder Kit Standard 30001-K02. This ready-to-install solution offers a seamless fit with OEM specifications, ensuring optimal functionality without the need for re-plating. Crafted for...09310276- SKU:
- 09310276
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
MSRP: $686.95Now: $618.26Was: $686.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ250F 2001-2004 20002-K01
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $750.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for effortless installation and optimal performance. This high-quality kit features components that mirror OEM specifications, ensuring a seamless fit and enhanced durability. With...09310278- SKU:
- 09310278
- Availability:
- Ships Same Business Day
- Weight:
- 3.90 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.7:1
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
MSRP: $750.95Now: $675.86Was: $750.95Qty in Cart: 0Quantity:Price:MSRP: $750.95Now: $675.86Was: $750.95Subtotal: -
On Sale
Cylinder Works Yamaha YZ250F 2008-2013 Standard Bore Cylinder Kit 20002-K03
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $750.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for seamless installation and optimal performance. This complete kit features high-quality components that ensure durability and efficiency, making it the perfect choice for enthusiasts...09310281- SKU:
- 09310281
- Availability:
- Ships Same Business Day
- Weight:
- 3.62 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Yamaha YZ450F 2006-2009 20003-K01
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $750.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for effortless installation and optimal performance. These direct bolt-on cylinders mirror OEM specifications, ensuring a seamless fit and enhanced durability. With Vertex pistons...09310282- SKU:
- 09310282
- Availability:
- Ships Same Business Day
- Weight:
- 3.33 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 95,00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-CYCLE
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Honda CRF150R 2007-2014 10004-K01HC
CYLINDER WORKS
MSRP: $579.95Now: $521.96Was: $579.95Elevate your engine's performance with the High Compression Cylinder Kit. Designed for easy installation, this kit offers a seamless fit without the need for re-plating, ensuring a professional finish that mirrors OEM quality. Featuring premium Vertex...09310288- SKU:
- 09310288
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- CYLINDER DIAMETER:
- 66,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- CYLINDER DIAMETER METRIC:
- 66.00 MM
- DISPLACEMENT:
- 149 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
MSRP: $579.95Now: $521.96Was: $579.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Honda CRF250X 2016-2017 10001-K01HC
CYLINDER WORKS
MSRP: $635.95Now: $572.36Was: $635.95Upgrade your engine with the CYLINDER WORKS High Compression Cylinder Kit, designed for effortless installation and optimal performance. This direct bolt-on solution mirrors the quality of OEM cylinders while enhancing longevity and reducing engine noise...09310289- SKU:
- 09310289
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- CYLINDER DIAMETER:
- 78,00 MM
- STYLE:
- HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
MSRP: $635.95Now: $572.36Was: $635.95 -
MOOSE RACING Engine Oil Seal Kit - Honda 822357
MOOSE RACING
$59.71Engine oil seals deteriorate over time, leading to slow leaks that compromise oil pressure, increase consumption, and accelerate internal wear. This complete seal kit eliminates guesswork by providing every critical seal your engine needs in one package,...09351027- SKU:
- 09351027
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- TYPE:
- OIL
$59.71Qty in Cart: 0Quantity:Price:$59.71Subtotal: -
MOOSE RACING Oil Seal Set - Honda 822378
MOOSE RACING
$37.56Engine seal degradation is one of the most common sources of oil leakage and contamination in high-mileage Honda engines. This complete oil seal set eliminates the guesswork of sourcing individual seals by bundling every critical seal your engine...09351052- SKU:
- 09351052
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
$37.56Qty in Cart: 0Quantity:Price:$37.56Subtotal:
