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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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...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...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...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 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...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 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...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...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 - 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...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...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,...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 -
MOOSE RACING Clutch Cylinder Guard 125/200 13-095
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain slap and impact damage, especially in aggressive riding conditions. This guard protects your investment while maintaining clean aesthetics through...09500192- SKU:
- 09500192
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
$42.95 -
MOOSE RACING Cylinder - Standard MSECW50008
MOOSE RACING
$487.95A worn or damaged cylinder directly compromises compression, power delivery, and engine reliability. The MOOSE RACING Standard Cylinder restores OEM performance with a precision-machined bore and a...09310970- SKU:
- 09310970
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- STANDARD
- COLOR/FINISH:
- GRAY
- CYLINDER DIAMETER:
- 88,00 MM
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- DISPLACEMENT:
- 350 CC
- RIDING STYLE:
- OFF-ROAD
$487.95 -
MOOSE RACING Cylinder - Standard MSECW50012
MOOSE RACING
$402.95A worn or damaged cylinder directly compromises your engine's compression, power delivery, and reliability. This MOOSE RACING replacement restores OEM performance with a precision-honed bore and...09310971- SKU:
- 09310971
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- BORE SIZE METRIC:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 39,50 MM
- ENGINE TYPE:
- 2-CYCLE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- GRAY
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- DISPLACEMENT:
- 50 CC
- MATERIAL:
- CAST
$402.95 -
MOOSE RACING Exhaust Gasket Kit 823155
MOOSE RACING
$21.87Exhaust gasket degradation is one of the most common sources of performance loss and emissions leaks in high-performance engines. A quality gasket kit ensures a perfect seal between exhaust manifolds...09345336- SKU:
- 09345336
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
$21.87 -
MOOSE RACING Case Saver - RMZ250 0950-0520
MOOSE RACING
$27.95Engine case damage can sideline your RMZ250 and drain your wallet fast. This MOOSE RACING case saver replaces fragile OEM plastic with precision-engineered aluminum protection, keeping your engine...09500520- SKU:
- 09500520
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$27.95 -
MOOSE RACING Complete Motor Gasket Kit - TW200 808642
MOOSE RACING
$77.38A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork—and the cost of sourcing...09344785- SKU:
- 09344785
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$77.38 -
MOOSE RACING Motor Seals - CR125R 822107
MOOSE RACING
$30.16Engine seal degradation is one of the most common causes of oil leakage and performance loss in two-stroke racing engines. MOOSE Racing Motor Seals deliver OEM-equivalent fit and durability at a...M822107- SKU:
- M822107
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- UNITS:
- SET
$30.16 -
MOOSE RACING Motor Seals - CR250/500 822110
MOOSE RACING
$28.47Engine seals are critical wear items that directly impact compression, oil retention, and overall engine reliability—especially in high-performance applications where tolerances are tight. MOOSE...M822110- SKU:
- M822110
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
$28.47 -
MOOSE RACING Motor Seals - CR250 822111
MOOSE RACING
$27.94A complete engine seal failure can sideline your CR250 at the worst possible moment. MOOSE Racing Motor Seals deliver OEM-equivalent performance at a fraction of OEM pricing, giving you the...M822111- SKU:
- M822111
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$27.94 -
MOOSE RACING Motor Seals - YZ125 822114
MOOSE RACING
$32.97When you're rebuilding a YZ125 engine or transmission, OEM seal kits command premium pricing—but MOOSE Racing Motor Seals deliver genuine OEM-equivalent quality at a fraction of the cost. Each set is...M822114- SKU:
- M822114
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$32.97 -
MOOSE RACING Top End Gasket - KX125 03 810430
MOOSE RACING
$38.67When you're rebuilding a KX125 top end, you need gaskets and seals that won't let you down—especially if you're running higher compression or replacing a piston. The MOOSE RACING Top End Gasket Set...09340072- SKU:
- 09340072
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$38.67
