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 Head Cover Gasket - KTM 819056
MOOSE RACING
$8.96A leaking valve cover gasket compromises engine sealing and can lead to oil contamination or loss. The OEM Moose Racing Head Cover Gasket for your KTM delivers genuine OEM-specification sealing at a...09346973- SKU:
- 09346973
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
$8.96 -
MOOSE RACING Ignition Cover Gasket 816249
MOOSE RACING
$18.60A leaking ignition cover doesn't just waste oil—it compromises engine bay cleanliness and can lead to costly secondary damage if fluid reaches electrical components. The MOOSE RACING Ignition Cover...09342128- SKU:
- 09342128
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$18.60 -
MOOSE RACING Clutch Cover Gasket 816240
MOOSE RACING
$13.42A leaking clutch cover gasket compromises engine sealing and can lead to oil contamination and loss of pressure—exactly what you don't want mid-race or mid-project. The MOOSE RACING 816240 clutch...09342129- SKU:
- 09342129
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$13.42Qty in Cart: 0Quantity:Price:$13.42Subtotal: -
MOOSE RACING Top End Gasket Kit - CRF250 810268
MOOSE RACING
$78.88A quality gasket and seal set is non-negotiable when rebuilding a CRF250 top end—factory gaskets often deteriorate during disassembly, and reusing them risks compression leaks, oil weeping, and...09341884- SKU:
- 09341884
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$78.88 -
MOOSE RACING Motor Gasket Kit with Seal - CRF250 811268
MOOSE RACING
$204.53An engine rebuild demands precision-fit gaskets and seals that won't compromise your work or wallet. MOOSE Racing delivers OEM-quality components at a fraction of dealership pricing, letting you...09341886- SKU:
- 09341886
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$204.53 -
MOOSE RACING Complete Gasket Kit 808338
MOOSE RACING
$73.12A complete engine and transmission rebuild requires precision sealing—any compromise on gaskets and seals invites leaks, performance loss, and costly failures. The MOOSE RACING Complete Gasket Kit...09341907- SKU:
- 09341907
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$73.12 -
MOOSE RACING Motor Gasket Kit with Seal - 65XC/SX 811338
MOOSE RACING
$113.30A complete engine and transmission rebuild requires precision gaskets and seals that won't compromise your build's integrity. OEM replacement parts come with premium pricing, but this Moose Racing...09341908- SKU:
- 09341908
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$113.30 -
MOOSE RACING Top End Gasket Kit - KTM 810340
MOOSE RACING
$25.81A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction...09342889- SKU:
- 09342889
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$25.81 -
MOOSE RACING Motor Gasket Kit with Seal - KTM 811340
MOOSE RACING
$89.83A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. The MOOSE RACING Motor Gasket Kit eliminates the frustration of sourcing individual...09342890- SKU:
- 09342890
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$89.83 -
MOOSE RACING Top End Gasket Kit - KTM 810342
MOOSE RACING
$70.25A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a...09342891- SKU:
- 09342891
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
$70.25 -
MOOSE RACING Complete Motor Gasket Kit - Ducati/KTM 808342
MOOSE RACING
$129.09A complete engine rebuild demands gasket and seal components that match OEM precision without the premium price tag. The MOOSE RACING Complete Motor Gasket Kit delivers factory-grade reliability...09342892- SKU:
- 09342892
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$129.09Qty in Cart: 0Quantity:Price:$129.09Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KTM 811342
MOOSE RACING
$164.45Engine rebuilds demand precision—using mismatched or worn gaskets and seals compromises compression, invites oil leakage, and risks catastrophic failure. The MOOSE RACING Motor Gasket Kit delivers...09342894- SKU:
- 09342894
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$164.45 -
MOOSE RACING Motor Gasket Kit with Seal - KTM 811343
MOOSE RACING
$187.20A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't fail under load. The MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a fraction of OEM...09342895- SKU:
- 09342895
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$187.20 -
MOOSE RACING Valve Shim - 9.48 x 3.00 - 5 pack MSE5PK948300
MOOSE RACING
$9.95Proper valve shim selection is critical to maintaining correct valve clearances and ensuring consistent performance across your engine's valve train. These forged 4140 steel shims eliminate guesswork...09261964- SKU:
- 09261964
- 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:
- 3.00 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.05 - 5 pack MSE5PK948305
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity, and having the right sizes on hand prevents costly downtime during top-end rebuilds. These Moose Racing shims are forged from 4140 cold rolled...09261965- SKU:
- 09261965
- 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
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 3.05 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.10 - 5 pack MSE5PK948310
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity and performance, and having the correct sizes on hand eliminates guesswork during valve train service. These MOOSE RACING shims are forged from...09261966- SKU:
- 09261966
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.10 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 3.40 - 5 pack MSE5PK948340
MOOSE RACING
$9.95Valve shim maintenance demands precision and reliability—guesswork has no place in your valve train. These forged 4140 cold rolled steel shims give you the durability and accuracy needed to dial in...09261972- SKU:
- 09261972
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 3.40 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Seal Kit M30-30550
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of oil consumption and compression loss in high-mileage engines—issues that compound quickly under racing conditions or sustained performance...09262815- SKU:
- 09262815
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$15.95 -
MOOSE RACING Valve Seal Kit M30-30680
MOOSE RACING
$15.95Valve seal degradation leads to oil consumption, blow-by, and performance loss—especially under sustained high RPM operation. The MOOSE RACING Valve Seal Kit M30-30680 replaces worn OEM seals with...09262816- SKU:
- 09262816
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
MOOSE RACING Valve Seal Kit M30-31530
MOOSE RACING
$15.95Valve seal degradation is one of the most common culprits behind oil consumption, reduced compression, and failed inspections—especially under high-boost or sustained high-RPM conditions. The MOOSE...09262818- SKU:
- 09262818
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal:
