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 Top End Gasket Kit - DVX/LTZ/KFX 810847
MOOSE RACING
$60.52Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810847- SKU:
- M810847
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
$60.52 -
MOOSE RACING Water Pump Seal - Kawasaki/Yamaha 503000
MOOSE RACING
$26.53A worn water pump seal is a silent threat to engine reliability—it allows coolant to weep past the impeller, compromising cooling system integrity and risking catastrophic overheating. The MOOSE RACING Water Pump Seal (503000mse) delivers OEM-grade...09350852- SKU:
- 09350852
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- WATER PUMP
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$26.53 -
MOOSE RACING Water Pump Seal - Arctic Cat 503002
MOOSE RACING
$26.53Water pump seal failure is one of the most common causes of coolant leaks in Arctic Cat engines, often leading to overheating and catastrophic engine damage if left unaddressed. This MOOSE Racing mechanical seal is engineered to OEM specifications,...09350854- SKU:
- 09350854
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- APPLICATION:
- WATER PUMP
- PRODUCT NAME:
- SEAL KIT
$26.53 -
MOOSE RACING Water Pump Seal - Polaris/Honda 503003
MOOSE RACING
$26.53Water pump seal failure is one of the most common causes of mid-season breakdowns in Polaris and Honda powersports applications. A worn or degraded seal allows coolant to leak past the pump shaft, leading to overheating, potential engine damage, and...09350855- SKU:
- 09350855
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- WATER PUMP
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- UTV
$26.53 -
MOOSE RACING Water Pump Seal - Polaris 503004
MOOSE RACING
$37.21High-quality mechanical water pump seals now available separately, Enhances existing complete gasket kits09350856- SKU:
- 09350856
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- WATER PUMP
$37.21 -
MOOSE RACING Water Pump Seal - Can-Am 503005M
MOOSE RACING
$27.08High-quality mechanical water pump seals now available separately, Enhances existing complete gasket kits09350857- SKU:
- 09350857
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- UTV
$27.08 -
MOOSE RACING Ignition Cover Gasket 816658
MOOSE RACING
$6.38Made in the U.S.A.09346158- SKU:
- 09346158
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$6.38Qty in Cart: 0Quantity:Price:$6.38Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - YZ450F/WR450F 808994
MOOSE RACING
$150.60Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09345997- SKU:
- 09345997
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$150.60 -
MOOSE RACING Top End Gasket Kit Yamaha 810994
MOOSE RACING
$64.58Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09345998- SKU:
- 09345998
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
$64.58 -
MOOSE RACING Complete Motor Gasket Kit - Arctic Cat/Suzuki 808828
MOOSE RACING
$70.11Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M808828- SKU:
- M808828
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$70.11Qty in Cart: 0Quantity:Price:$70.11Subtotal: -
LA Sleeve Sleeve and Piston Kit Kawasaki KX100 2014-2019 LAS5779K
LA SLEEVE
$326.95Upgrade your motorcycle's performance with the LA SLEEVE Sleeve and Piston Kit, designed specifically for Kawasaki models. This comprehensive kit offers an exceptional solution for top-end rebuilds, enhancing engine efficiency and power output...09310862- SKU:
- 09310862
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SLEEVE AND PISTON KIT
$326.95 -
LA Sleeve Cylinder Sleeve 47.50mm Bore for 2003-2004 Honda CR85R CR85RB Expert H5488
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5488, designed for optimal performance and durability. This high-quality replacement sleeve ensures your cylinders operate like new, extending the life of your engine. Perfect for those who...09310001- SKU:
- 09310001
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE METRIC:
- 47.50 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
LA Sleeve Cylinder Sleeve 95mm Yamaha YZ426F 2000-2002 YA5424
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve YA5424, designed to restore performance and extend the life of your old cylinders. Engineered for precision and durability, this replacement sleeve ensures a perfect fit and optimal functionality,...09310011- SKU:
- 09310011
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- BORE SIZE METRIC:
- 95.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$131.95 -
LA Sleeve Cylinder Sleeve 95mm Bore for KTM 520 2000-2002 FL5437
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5437, designed for superior performance and durability. This high-quality replacement sleeve ensures a perfect fit, extending the life of your cylinders and enhancing overall engine efficiency...09310035- SKU:
- 09310035
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE SIZE METRIC:
- 95.00 MM
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
LA Sleeve Cylinder Sleeve for Suzuki RM85 2002-2022 FL5479
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5479, designed for optimal performance and durability. These high-quality replacement sleeves breathe new life into old cylinders, ensuring a perfect fit and enhanced engine efficiency. Upgrade...09310039- SKU:
- 09310039
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 48.00 MM
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$117.95 -
LA Sleeve Cylinder Sleeve for Honda CR250R 2004 H5535
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5535, designed to restore performance and extend the life of your cylinders. Crafted with precision and durability in mind, this quality replacement sleeve ensures optimal fit and function,...09310152- SKU:
- 09310152
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 54mm Bore Honda CR125R 2005-2007 H5579
LA SLEEVE
$127.95Revitalize your engine with the LA SLEEVE H5579 Cylinder Sleeve, designed to restore performance and extend the life of your cylinders. Crafted from high-quality materials, these sleeves offer a perfect fit and exceptional durability, ensuring your...09310153- SKU:
- 09310153
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
$127.95 -
LA Sleeve Cylinder Sleeve 66.40mm Bore Honda CR250R 2005-2007 H5580
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5580, designed for superior performance and durability. These high-quality replacement sleeves are engineered to restore old cylinders, ensuring optimal functionality and longevity. Experience...09310154- SKU:
- 09310154
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$148.95 -
LA Sleeve Cylinder Sleeve for 2002-2006 Polaris 600 Models 77.25mm FL1289
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5592, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and restores the functionality of your old cylinders, making it an ideal choice...09310159- SKU:
- 09310159
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- BORE SIZE METRIC:
- 85.00 MM
- COLOR/FINISH:
- ALUMINUM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- TYPE:
- AC
$117.95 -
LA Sleeve Cylinder Sleeve for Kawasaki KX100 2006-2013 KA5608
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5608, designed for precision fit and enhanced performance. This high-quality replacement sleeve ensures optimal sealing and durability, giving your old cylinders a fresh start. Engineered for...09310160- SKU:
- 09310160
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- TYPE:
- AC
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 52.50 MM
- COLOR/FINISH:
- CHROME
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal:
