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 Water Pump Rebuild Kit 821612
MOOSE RACING
$49.72A failing water pump can leave you stranded or cause catastrophic engine damage—and replacement isn't always practical for race teams or serious enthusiasts who need their engine back on the track fast. The MOOSE RACING Water Pump Rebuild Kit 821612...09345250- SKU:
- 09345250
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$49.72 -
MOOSE RACING Water Pump Rebuild Kit 821613
MOOSE RACING
$45.92A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to factory specifications without the cost of a complete replacement...09345251- SKU:
- 09345251
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$45.92 -
MOOSE RACING Water Pump Rebuild Kit 821635
MOOSE RACING
$58.92A failing water pump compromises your entire cooling system—leaving you stranded trackside or dealing with catastrophic engine damage. The MOOSE RACING Water Pump Rebuild Kit 821635 gives you everything needed to restore your pump to OEM specifications...09345253- SKU:
- 09345253
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$58.92 -
MOOSE RACING Water Pump Rebuild Kit 821636
MOOSE RACING
$46.83A failing water pump can quickly escalate from a minor coolant leak into catastrophic engine damage. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap ring needed to restore your water pump to factory performance...09345254- SKU:
- 09345254
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$46.83 -
MOOSE RACING Water Pump Rebuild Kit 821639
MOOSE RACING
$44.05A failing water pump can leave you stranded on the track or trail, and replacement isn't always practical when a complete rebuild will restore your pump to OEM specifications. This MOOSE RACING rebuild kit gives you every seal, bearing, and gasket needed...09345255- SKU:
- 09345255
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$44.05 -
MOOSE RACING Water Pump Rebuild Kit 821641
MOOSE RACING
$40.22A failing water pump can quickly escalate into catastrophic engine damage, making a quality rebuild kit essential maintenance for any serious racer or performance enthusiast. Rather than replacing the entire assembly, this MOOSE RACING rebuild kit...09345256- SKU:
- 09345256
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$40.22 -
MOOSE RACING Clutch Outer Gasket - Suzuki 816169
MOOSE RACING
$13.02A worn or degraded clutch outer gasket compromises your clutch cover seal, leading to oil seepage, contamination, and potential clutch failure during critical racing moments. The MOOSE RACING Clutch Outer Gasket is engineered to maintain a reliable,...09346960- SKU:
- 09346960
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- CLUTCH OUTER
- RIDING STYLE:
- OFF-ROAD
$13.02 -
MOOSE RACING Ignition Cover Gasket 816170
MOOSE RACING
$11.22A failing ignition cover gasket compromises your engine's seal integrity, risking oil seepage and potential ignition system damage—especially critical in high-performance and racing applications where reliability is non-negotiable. The MOOSE Racing...09346961- SKU:
- 09346961
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$11.22 -
MOOSE RACING Clutch Outer Gasket - Suzuki 816185
MOOSE RACING
$11.73A worn or damaged clutch outer gasket compromises your clutch cover seal, leading to oil leakage and potential drivetrain failure. This OEM-equivalent MOOSE RACING gasket restores a critical seal point and ensures your clutch assembly maintains proper...09346962- SKU:
- 09346962
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- CLUTCH OUTER
$11.73 -
MOOSE RACING Ignition Cover Gasket 816239
MOOSE RACING
$10.84An ignition cover gasket that fails prematurely wastes time and risks engine contamination. The MOOSE RACING Ignition Cover Gasket delivers OEM-quality sealing at a fraction of the cost, whether you're rebuilding from the ground up or addressing a...09342130- SKU:
- 09342130
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$10.84 -
MOOSE RACING Complete Motor Gasket Kit - CRF250 808285
MOOSE RACING
$154.95A complete engine rebuild demands precision gaskets and seals that won't compromise reliability or break your budget. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to restore your...09342201- SKU:
- 09342201
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$154.95 -
MOOSE RACING Complete Motor Gasket Kit - 350SXF 808339
MOOSE RACING
$140.62A complete engine and transmission rebuild demands precision-engineered gaskets and seals that won't compromise reliability or cost you a fortune. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of the price,...09342202- SKU:
- 09342202
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
$140.62 -
MOOSE RACING Complete Motor Gasket Kit - RMZ250 808567
MOOSE RACING
$141.67A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by providing every gasket, o-ring, and valve seal you need in one package—all...09342203- SKU:
- 09342203
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$141.67 -
MOOSE RACING Complete Motor Gasket Kit - YZ450F 808689
MOOSE RACING
$153.37A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of factory pricing, eliminating...09342204- SKU:
- 09342204
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$153.37Qty in Cart: 0Quantity:Price:$153.37Subtotal: -
MOOSE RACING Top End Gasket Kit - CRF250 810285
MOOSE RACING
$73.09When you're rebuilding a CRF250 top end, you need gaskets and seals that maintain proper compression and prevent oil leakage under sustained load. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of the cost, so you can...09342205- SKU:
- 09342205
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$73.09 -
MOOSE RACING Top End Gasket Kit - 350SXF 810339
MOOSE RACING
$97.12A top-end rebuild demands precision gasket sealing—any leak compromises compression, performance, and engine longevity. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of the cost, with every component engineered for accurate...09342206- SKU:
- 09342206
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$97.12 -
MOOSE RACING Piston Kit - 66.35 mm MSE22584B
MOOSE RACING
$169.95When your piston package fails mid-season, you need a direct replacement engineered to outlast the original—not a compromise. The MOOSE RACING Piston Kit MSE22584B combines gravity-cast aluminum with 18% silicon reinforcement to resist thermal distortion...09102684- SKU:
- 09102684
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
MOOSE RACING Piston Kit - 53.96 mm MSE22652B
MOOSE RACING
$170.95A piston kit built to outlast the competition. The gravity-cast aluminum alloy with 18% silicon resists wear and thermal distortion better than standard pistons, meaning longer engine life and more reliable performance between rebuilds. Whether you're...09102688- SKU:
- 09102688
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$170.95 -
MOOSE RACING Cylinder - Standard MSE10001
MOOSE RACING
$340.95A worn or damaged cylinder directly impacts your engine's compression, power delivery, and longevity. The MOOSE RACING Standard Cylinder restores OEM performance specifications with a precision-machined bore and a nickel silicon carbide plating that...09310441- SKU:
- 09310441
- Availability:
- Ships Same Business Day
- Weight:
- 2.63 LBS
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- UNITS:
- EACH
$340.95 -
MOOSE RACING Piston Ring - For 43.46 mm Piston MSE53008004350
MOOSE RACING
$25.95A worn or damaged piston ring compromises compression, increases blowby, and robs your engine of power and efficiency. The MOOSE RACING Piston Ring delivers OEM-quality replacement performance, restoring proper ring seal and combustion pressure for...09120846- SKU:
- 09120846
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- EACH
$25.95
