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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MOOSE RACING Oil Filter Cover - Kawasaki T14-2300GB
MOOSE RACING
$32.95CNC Machined covers made from 6061 T6 Aluminum, Black anodized finish for added looks and appeal, Aluminum cover helps dissipate added heat from engine oil, Light weight and durable design09401940- SKU:
- 09401940
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- OIL FILTER
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
SHINDY Needle Bearing - 16 mm x 21 mm x 19.5 mm 10-251
SHINDY
$10.20Piston pin needle cage bearings are manufactured from precision bearings and high-quality housing material, Each bearing is packaged in an individual box for easy identificationNB1463- SKU:
- NB1463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- INSIDE DIAMETER METRIC:
- 16 MM
- LENGTH METRIC:
- 19.5 MM
- TYPE:
- NEEDLE
- INSIDE DIAMETER:
- 16 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- LENGTH:
- 19,5 MM
- OUTSIDE DIAMETER:
- 21 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 21 MM
- UNITS:
- EACH
$10.20 -
LA Sleeve Cylinder Sleeve 1993 Suzuki RM125 FL5181
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5181, designed for superior performance and durability. This high-quality replacement sleeve ensures a perfect fit, allowing your old cylinders to regain their functionality and extend engine...FL5181- SKU:
- FL5181
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
LA Sleeve Cylinder Sleeve 77mm Bore Yamaha YZ250F 2004-2013 WR250F 2004-2013 YA5536
LA SLEEVE
$108.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve YA5536, designed to provide a durable and effective solution for worn-out cylinders. This high-quality replacement sleeve ensures optimal performance, enhancing the longevity and reliability of...09310265- SKU:
- 09310265
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal: -
LA Sleeve Cylinder Rebuild Kit for 2005-2007 Honda CR85R CR85RB Expert LAS-5599K
LA SLEEVE
$312.95Revitalize your engine with the LA SLEEVE Sleeve and Piston Kit, designed specifically for Honda models. This comprehensive top-end rebuild kit combines advanced materials and engineering to enhance performance, ensuring optimal compression, torque, and...09310382- SKU:
- 09310382
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- MATERIAL:
- CAST
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
Cylinder Works Big Bore Gasket Kit for 2016-2023 KTM 250 SX-F 81mm Bore 51006-G01
CYLINDER WORKS
$146.95Enhance your engine's performance with the CYLINDER WORKS Gasket Kit Big Bore 51006-G01, expertly crafted in the U.S.A. This high-quality gasket kit is designed for durability and precision, ensuring a perfect fit for your big bore applications. Trust in...09346005- SKU:
- 09346005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- OVERSIZE (+3.00 MM)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$146.95Qty in Cart: 0Quantity:Price:$146.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit for Honda CRF450R 2019 10010-K02
CYLINDER WORKS
$677.95Elevate your engine's performance with the Cylinder Works Cylinder Kit for Honda. This ready-to-install, direct bolt-on solution ensures a seamless fit and enhanced longevity without the need for re-plating. Crafted with precision, this kit includes...09310840- SKU:
- 09310840
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
$677.95Qty in Cart: 0Quantity:Price:$677.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Polaris General 1000 2017-2019 61006-K01
CYLINDER WORKS
$1,309.95Enhance your Polaris 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. With premium components...09310844- SKU:
- 09310844
- Availability:
- Ships Same Business Day
- Weight:
- 9.65 LBS
- DISPLACEMENT:
- 1110 CC
- RIDING STYLE:
- UTV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-CYCLE
$1,309.95Qty in Cart: 0Quantity:Price:$1,309.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2019 10010-K02
CYLINDER WORKS
$390.95Experience unparalleled performance with the CYLINDER WORKS Cylinder Standard 10010. Engineered for seamless installation, this direct bolt-on replacement cylinder mirrors the OEM design while offering superior durability. Crafted with precision in the U...09310712- SKU:
- 09310712
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$390.95Qty in Cart: 0Quantity:Price:$390.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit CRF 450 R 2017-2018 11010-K01
CYLINDER WORKS
$820.95Elevate your engine's performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for seamless installation, this high-quality kit enhances your bike's capabilities while maintaining a factory-like appearance. With precision-engineered...09310715- SKU:
- 09310715
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- STANDARD
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 99,00 MM
- ENGINE TYPE:
- 4-CYCLE
$820.95Qty in Cart: 0Quantity:Price:$820.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 50007-K01
CYLINDER WORKS
$754.95Enhance your engine's performance with the CYLINDER WORKS Cylinder Kit, designed for effortless installation and optimal durability. These high-quality, direct bolt-on cylinders mirror the specifications of OEM parts, ensuring a seamless fit and reliable...09310721- SKU:
- 09310721
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- CYLINDER DIAMETER:
- 88,00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
$754.95Qty in Cart: 0Quantity:Price:$754.95Subtotal: -
Cylinder Works Cylinder Kit Husqvarna FC 350 2016-2018 50007-K01HC
CYLINDER WORKS
$834.95Upgrade your engine with the Cylinder Works Cylinder Kit 50007-K01HC, designed for optimal performance and durability. This ready-to-install kit features precision-engineered components that mirror OEM specifications, ensuring a seamless fit and enhanced...09310722- SKU:
- 09310722
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- CYLINDER DIAMETER:
- 88,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- STYLE:
- STANDARD
$834.95Qty in Cart: 0Quantity:Price:$834.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 366cc 14.0:1 Compression 90mm 51007-K01
CYLINDER WORKS
$866.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Cylinder Kit. Designed for easy installation, this ready-to-use kit enhances power while maintaining the reliability and aesthetics of OEM cylinders. Each kit includes high-quality...09310723- SKU:
- 09310723
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- CYLINDER DIAMETER:
- 90,00 MM
- DISPLACEMENT:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- BIG BORE
$866.95Qty in Cart: 0Quantity:Price:$866.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2014-2017 21005-K02
CYLINDER WORKS
$834.95Upgrade your engine with the CYLINDER WORKS Big Bore Cylinder Kit, designed for optimal performance and durability. This ready-to-install kit offers a seamless fit and enhances your bike's power without the need for additional machining. With...09310590- SKU:
- 09310590
- Availability:
- Ships Same Business Day
- Weight:
- 4.40 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 468 CC
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- CYLINDER DIAMETER:
- 99,00 MM
$834.95Qty in Cart: 0Quantity:Price:$834.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Yamaha WR250F 2015-2019 21010-K01
CYLINDER WORKS
$771.95Enhance 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 delivering superior durability and efficiency. Experience improved power output and...09310591- SKU:
- 09310591
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER:
- 80,00 MM
$771.95Qty in Cart: 0Quantity:Price:$771.95Subtotal: -
Cylinder Works Rear Cylinder Kit Kawasaki KVF750 Brute Force 2015-2020 30008-K02
CYLINDER WORKS
$639.95Upgrade your engine performance with the CYLINDER WORKS Rear Cylinder Kit Standard Bore 30008-K02. This ready-to-install kit features high-quality components designed for seamless integration, ensuring optimal functionality and reliability. With...09310611- SKU:
- 09310611
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 85.00 MM
- PRODUCT NAME:
- REAR CYLINDER KIT
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 85,00 MM
- DISPLACEMENT:
- 749 CC
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
$639.95Qty in Cart: 0Quantity:Price:$639.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR XP 1000 2014-2015 60003-K02
CYLINDER WORKS
$1,012.95Experience enhanced performance and reliability with the CYLINDER WORKS Cylinder Kit. Designed as a direct bolt-on replacement, this kit offers a seamless installation without the need for re-plating, ensuring your engine runs smoothly and efficiently...09310618- SKU:
- 09310618
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- CYLINDER DIAMETER:
- 93,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 999 CC
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
$1,012.95Qty in Cart: 0Quantity:Price:$1,012.95Subtotal: -
Cylinder Works CRF 450 R 2013-2016 Standard Bore Cylinder Kit 10006-K02
CYLINDER WORKS
$664.95Upgrade your engine with the CYLINDER WORKS Cylinder Kit, designed for seamless installation and optimal performance. This ready-to-install kit features OEM-like aesthetics while incorporating advanced materials for enhanced durability and efficiency. ...09310489- SKU:
- 09310489
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal: -
Cylinder Works Yamaha YFM700R Raptor 2006-2014 Standard Bore Cylinder Kit 20004-K01
CYLINDER WORKS
$780.95Elevate your engine's performance with the CYLINDER WORKS Cylinder Kit Standard 20004-K01. This ready-to-install, direct bolt-on solution mirrors the quality and appearance of OEM cylinders, ensuring a seamless upgrade. Engineered for durability and...09310379- SKU:
- 09310379
- Availability:
- Ships Same Business Day
- Weight:
- 8.34 LBS
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- CYLINDER DIAMETER:
- 102,00 MM
- CYLINDER DIAMETER METRIC:
- 102.00 MM
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 686 CC
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
$780.95Qty in Cart: 0Quantity:Price:$780.95Subtotal: -
DEL WEST Exhaust Valve DW-YZ250F-EV14
DEL WEST
$155.95Meets the demands of off-road, all valves are backed by an established record of performance and reliability in competition that is unapproachable09262721- SKU:
- 09262721
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
$155.95Qty in Cart: 0Quantity:Price:$155.95Subtotal:
