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 Motor Gasket Kit with Seal - 250SX/XC 811333
MOOSE RACING
$110.53A complete engine and transmission rebuild requires precision-fit gaskets and seals—factory-quality parts at a fraction of OEM pricing. This Moose Racing kit eliminates the frustration of sourcing individual components by bundling everything you need in...09341693- SKU:
- 09341693
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$110.53 -
MOOSE RACING Motor Gasket Kit with Seal - 300XC/XCW 811335
MOOSE RACING
$96.69A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising here guarantees leaks, contamination, and costly downtime. The MOOSE RACING Motor Gasket Kit delivers OEM-quality seals at a fraction of OEM pricing, giving...09341695- SKU:
- 09341695
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$96.69 -
MOOSE RACING Clutch Cover Gasket 816215
MOOSE RACING
$17.74A leaking clutch cover gasket compromises engine sealing and can lead to oil loss, contamination, and potential engine damage. The MOOSE RACING Clutch Cover Gasket 816215 delivers OEM-equivalent sealing performance at a fraction of OEM costs, using...09341452- SKU:
- 09341452
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$17.74 -
MOOSE RACING Clutch Cover Gasket 816630
MOOSE RACING
$9.97A leaking clutch cover doesn't just waste oil—it compromises engine sealing integrity and creates mess on your garage floor. The MOOSE RACING Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of the cost, using high-tech...09341455- SKU:
- 09341455
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$9.97 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810364
MOOSE RACING
$86.00A top-end rebuild demands precision—and OEM gasket kits come with OEM pricing. The MOOSE RACING Top End Gasket Kit delivers every seal, O-ring, and gasket you need for a complete engine refresh at a fraction of the cost, using high-tech materials...09344770- SKU:
- 09344770
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$86.00 -
MOOSE RACING Motor Seals - RM125 822124
MOOSE RACING
$30.68Engine seal degradation is one of the most common causes of oil leaks, compression loss, and premature wear—yet many builders waste money on overpriced OEM alternatives. MOOSE RACING Motor Seals deliver genuine replacement quality at a fraction of the...M822124- SKU:
- M822124
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$30.68 -
MOOSE RACING Motor Seals - Yamaha 822228
MOOSE RACING
$40.15Engine and transmission seals are wear items that directly impact oil retention, pressure integrity, and overall drivetrain longevity. OEM replacement seals from Moose Racing give you factory-spec fit and durability without the dealership markup. This...09340339- SKU:
- 09340339
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$40.15 -
MOOSE RACING Complete Motor Gasket Kit - YZ125 808641
MOOSE RACING
$55.47A complete engine rebuild demands precision gaskets and seals that won't fail under race conditions. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork and expense of sourcing individual components—everything you need for YZ125 engine...09340492- SKU:
- 09340492
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$55.47 -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811641
MOOSE RACING
$69.07A complete engine and transmission rebuild demands gasket and seal quality you can trust—and OEM pricing that doesn't drain your budget. The MOOSE RACING Motor Gasket Kit delivers genuine OEM-spec seals paired with US-manufactured gaskets, so you can...09340493- SKU:
- 09340493
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$69.07 -
MOOSE RACING Complete Motor Gasket Kit without Seals - YZ85 8110026
MOOSE RACING
$98.45A complete engine and transmission rebuild demands gasket and seal integrity—any compromise risks catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent reliability at a fraction of the cost, using high-tech materials...09346449- SKU:
- 09346449
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$98.45 -
MOOSE RACING Complete Motor Gasket Kit without Seals - KX450 8110027
MOOSE RACING
$221.09A complete engine rebuild demands precision gaskets that match OEM specifications without the premium price tag. This Moose Racing kit delivers comprehensive gasket coverage for both engine and transmission, allowing you to refresh sealing surfaces with...09346450- SKU:
- 09346450
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
$221.09 -
MOOSE RACING Complete Motor Gasket Kit - KX/RM65 808412
MOOSE RACING
$45.27A complete engine and transmission rebuild demands gasket and seal integrity—any compromise risks catastrophic failure and wasted labor. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality replacement seals and gaskets at a fraction of...M808412- SKU:
- M808412
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$45.27 -
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
$9.95 -
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
