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 - CRF450X 810276
MOOSE RACING
$103.88A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity—this Moose Racing kit delivers OEM-quality components at a fraction of factory pricing. Whether you're replacing worn seals during routine maintenance or...09340968- SKU:
- 09340968
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$103.88 -
MOOSE RACING Valve Shim - 9.48 x 1.65 - 5 pack MSE5PK948165
MOOSE RACING
$9.95Maintaining precise valve clearances is critical for engine performance and longevity—and having quality shims on hand eliminates downtime during valve adjustments. These MOOSE RACING shims are forged from 4140 cold rolled steel for durability and...09261937- SKU:
- 09261937
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.65 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 1.85 - 5 pack MSE5PK948185
MOOSE RACING
$9.95Valve shim maintenance is critical to proper engine tuning and longevity—getting the right sizes on hand eliminates guesswork during valve adjustments. MOOSE RACING's forged 4140 steel shims are precision-manufactured to exact tolerances, ensuring...09261941- SKU:
- 09261941
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.85 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.00 - 5 pack MSE5PK948200
MOOSE RACING
$9.95Precision valve train maintenance demands reliable, accurately-sized shims that won't fail under load. MOOSE RACING valve shims are forged from 4140 cold rolled steel—not sintered—ensuring consistent hardness and durability across your entire valve...09261944- SKU:
- 09261944
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 9.48 x 2.05 - 5 pack MSE5PK948205
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity, and having quality shims on hand eliminates downtime during routine valve train service. These MOOSE Racing shims are forged from 4140 cold rolled steel—significantly...09261945- SKU:
- 09261945
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.05 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.20 - 5 pack MSE5PK948220
MOOSE RACING
$9.95Proper valve train geometry is critical to engine performance and longevity, and worn or incorrect shim sizes will compromise both. This 5-pack of MOOSE RACING valve shims gives you the precision sizing needed to dial in your valve clearances without...09261948- SKU:
- 09261948
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.20 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.50 - 5 pack MSE5PK948250
MOOSE RACING
$9.95Precision valve train maintenance demands reliable, accurately-sized shims that won't fail under load. This MOOSE RACING 5-pack gives you multiple shims of the same dimension, eliminating the guesswork and downtime when adjusting valve clearances on your...09261954- SKU:
- 09261954
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- VALVE SHIM THICKNESS METRIC:
- 2.50 MM
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.70 - 5 pack MSE5PK948270
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity and performance—incorrect clearances lead to valve float, poor combustion, and catastrophic damage. These MOOSE RACING shims give you precise valve train control without the guesswork, and the...09261958- SKU:
- 09261958
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.70 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Complete Gasket Set - Suzuki 808590
MOOSE RACING
$109.72A complete gasket set is essential for maintaining proper engine sealing and preventing fluid leaks across critical engine surfaces. Whether you're rebuilding after a top-end refresh or performing routine engine maintenance, MOOSE RACING's...09346949- SKU:
- 09346949
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
$109.72 -
MOOSE RACING Complete Gasket Set - Suzuki 808592
MOOSE RACING
$93.43A complete gasket set is the foundation of engine reliability—sealing critical surfaces to prevent oil leaks, coolant loss, and combustion gas escape that compromise performance and longevity. Whether you're rebuilding after high-mileage wear or...09346950- SKU:
- 09346950
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET SET
$93.43 -
MOOSE RACING Complete Gasket Set - Suzuki 808983
MOOSE RACING
$146.11A complete gasket set is essential insurance against catastrophic engine failure—worn or compromised gaskets lead to oil leaks, coolant seepage, and combustion blow-by that compromise performance and reliability. MOOSE RACING's OEM-quality gasket set...09346951- SKU:
- 09346951
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$146.11 -
MOOSE RACING Top End Gasket Set - Suzuki DRZ 810588
MOOSE RACING
$43.80A top-end gasket set is essential for maintaining compression and preventing oil leakage in your DRZ engine. Whether you're rebuilding after high-mileage wear or performing routine maintenance, MOOSE RACING gaskets ensure reliable sealing under demanding...09346952- SKU:
- 09346952
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$43.80 -
MOOSE RACING Top End Gasket Set - Suzuki DR 350 SE 810592
MOOSE RACING
$55.47A top-end gasket set is critical for maintaining compression integrity and preventing coolant or oil seepage in your DR 350 SE's cylinder head. Factory gaskets degrade over time, and reusing them during any top-end work risks costly leaks and performance...09346953- SKU:
- 09346953
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$55.47Qty in Cart: 0Quantity:Price:$55.47Subtotal: -
MOOSE RACING Gasket Set with Seals - Suzuki/Kawasaki 811531
MOOSE RACING
$88.62A complete gasket and seal set is essential for maintaining compression integrity and preventing fluid leaks across critical engine junction points. Whether you're rebuilding after significant mileage or performing preventative maintenance, MOOSE...09346954- SKU:
- 09346954
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$88.62 -
MOOSE RACING Gasket Set with Seals - Suzuki 811588
MOOSE RACING
$105.55Engine gasket degradation is one of the most common sources of oil leaks, coolant seepage, and performance loss in high-mileage engines. A complete gasket set with OEM-quality seals ensures a proper compression chamber, prevents fluid loss, and maintains...09346955- SKU:
- 09346955
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
$105.55 -
MOOSE RACING Gasket Set with Seals - Suzuki 811592
MOOSE RACING
$113.95A complete gasket and seal set is essential for maintaining critical engine compression and preventing fluid leaks at every junction in your engine block. MOOSE RACING's precision-engineered gasket set ensures proper sealing across all contact points,...09346956- SKU:
- 09346956
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
$113.95 -
MOOSE RACING Gasket Clutch Inner - Suzuki 816032
MOOSE RACING
$13.26A worn or damaged clutch gasket compromises your entire clutch assembly's integrity, leading to fluid leaks, slippage, and potential catastrophic failure on the track or trail. The MOOSE RACING Gasket Clutch Inner delivers OEM-equivalent sealing...09346957- SKU:
- 09346957
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
- RIDING STYLE:
- STREET
$13.26Qty in Cart: 0Quantity:Price:$13.26Subtotal: -
MOOSE RACING Gasket Clutch Inner - KTM 816055
MOOSE RACING
$11.00A worn or damaged clutch gasket compromises your KTM's seal integrity, leading to fluid leakage and inconsistent clutch engagement during high-load riding. The MOOSE RACING Gasket Clutch Inner delivers OEM-equivalent sealing performance with proven...09346958- SKU:
- 09346958
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
$11.00 -
MOOSE RACING Gasket Clutch Inner - Suzuki 816168
MOOSE RACING
$17.35A worn or compromised clutch inner gasket compromises the integrity of your clutch assembly, leading to fluid seepage, slipping engagement, and reduced power transfer to the wheels. The MOOSE RACING Gasket Clutch Inner is engineered to OEM...09346959- SKU:
- 09346959
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- CLUTCH INNER
$17.35Qty in Cart: 0Quantity:Price:$17.35Subtotal: -
MOOSE RACING Valve Shim - 10.0 x 2.30 - 5 pack MSE5PK1000230
MOOSE RACING
$10.95Precision valve train maintenance demands reliable shims you can identify at a glance—and trust under load. These MOOSE RACING valve shims eliminate guesswork with laser-etched sizing, so you spend less time sorting and more time building. Forged from...09261839- SKU:
- 09261839
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.30 MM
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
$10.95
