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 Valve Shim - 10.0 x 2.35 - 5 pack MSE5PK1000235
MOOSE RACING
$10.95Precision valve train maintenance demands reliability, and these MOOSE RACING shims deliver exactly that. Forged from 4140 cold-rolled steel rather than sintered material, they resist deformation under high-RPM loads and repeated adjustment cycles. The...09261840- SKU:
- 09261840
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 2.35 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 2.45 - 5 pack MSE5PK1000245
MOOSE RACING
$10.95Precision valve train maintenance demands reliable, durable shims that won't let you down mid-rebuild. These MOOSE RACING valve shims are forged from 4140 cold rolled steel—not sintered—giving you superior strength and consistency across your entire...09261842- SKU:
- 09261842
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 2.55 - 5 pack MSE5PK1000255
MOOSE RACING
$10.95Maintaining precise valve clearances is critical for engine performance and longevity, and having quality shims on hand eliminates downtime during valve train service. MOOSE Racing's forged 4140 steel shims deliver the durability and accuracy you need...09261844- SKU:
- 09261844
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.55 MM
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 2.60 - 5 pack MSE5PK1000260
MOOSE RACING
$10.95Proper valve shim sizing is critical to maintaining precise valve clearances and engine performance—improper clearances lead to valve float, reduced power delivery, and accelerated wear on your valve train. These MOOSE RACING shims give you the exact...09261845- SKU:
- 09261845
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- WATERCRAFT
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 2.65 - 5 pack MSE5PK1000265
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine performance and longevity—and having quality shims on hand eliminates guesswork during valve train service. MOOSE Racing valve shims are forged from 4140 cold rolled steel, offering superior...09261846- SKU:
- 09261846
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.65 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.30 - 5 pack MSE5PK748130
MOOSE RACING
$9.95Maintaining proper valve clearance is critical to engine performance and longevity—even small deviations can cause valve float, increased wear, and lost power. MOOSE Racing valve shims give you the precision tools to dial in your valve train quickly and...09261860- SKU:
- 09261860
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.30 MM
$9.95 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811582
MOOSE RACING
$102.83A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work—OEM replacements from reputable manufacturers are essential, not optional. This MOOSE RACING kit eliminates the frustration of sourcing...M811582- SKU:
- M811582
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$102.83 -
MOOSE RACING Clutch Cover Gasket 817672
MOOSE RACING
$6.84A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination during critical racing or riding conditions. The MOOSE RACING Clutch Cover Gasket 817672 delivers OEM-equivalent sealing performance at a fraction of OEM...M817672- SKU:
- M817672
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$6.84 -
MOOSE RACING Ignition Cover Gasket 817675
MOOSE RACING
$7.01A failing ignition cover gasket will compromise engine sealing and invite oil leakage—costly problems that compound quickly if left unchecked. The MOOSE RACING 817675 delivers OEM-equivalent durability at a fraction of dealership pricing, making it the...M817675- SKU:
- M817675
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
- UNITS:
- EACH
$7.01 -
MOOSE RACING Clutch Cover Gasket 817685
MOOSE RACING
$6.11A leaking clutch cover gasket compromises engine sealing integrity and creates mess on your shop floor. The MOOSE RACING 817685 delivers OEM-equivalent performance at a fraction of OEM pricing, using high-tech materials engineered for precision fitment...M817685- SKU:
- M817685
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$6.11 -
MOOSE RACING Clutch Cover Gasket 817690
MOOSE RACING
$10.21A leaking clutch cover gasket compromises engine sealing and can lead to oil seepage that affects performance and reliability. This Moose Racing replacement gasket restores OEM-level integrity at a fraction of OEM pricing, using high-tech materials...M817690- SKU:
- M817690
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$10.21 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808365
MOOSE RACING
$130.03A complete engine and transmission rebuild demands precision gaskets and seals that match OEM specifications without the OEM price tag. The MOOSE RACING Complete Motor Gasket Kit delivers all the components you need—gaskets, o-rings, and valve...09344778- SKU:
- 09344778
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$130.03 -
MOOSE RACING Ignition Cover Gasket 817692
MOOSE RACING
$5.62A leaking ignition cover gasket compromises engine sealing and can lead to oil seepage, increased wear, and potential engine damage over time. The MOOSE RACING Ignition Cover Gasket delivers OEM-quality sealing at a fraction of the cost, making it an...M817692- SKU:
- M817692
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- IGNITION COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$5.62Qty in Cart: 0Quantity:Price:$5.62Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - 250 SXF/XCF 808364
MOOSE RACING
$127.10A complete engine and transmission rebuild requires precision gasket sealing—any leak or poor fit compromises performance and reliability. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by providing all necessary gaskets, seals, and...09344784- SKU:
- 09344784
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$127.10 -
MOOSE RACING Complete Motor Gasket Kit - CRF100/XR100 808221
MOOSE RACING
$74.51A complete engine rebuild demands precision seals and gaskets that won't fail under load. This MOOSE RACING kit eliminates the guesswork of sourcing individual components—every gasket, o-ring, and seal you need for a full CRF100/XR100 engine and...M808221- SKU:
- M808221
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$74.51Qty in Cart: 0Quantity:Price:$74.51Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - KX/RM60 808407
MOOSE RACING
$39.34A complete engine and transmission rebuild demands gasket and seal integrity—any compromise leads to leaks, performance loss, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent reliability at a fraction of OEM...M808407- SKU:
- M808407
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$39.34Qty in Cart: 0Quantity:Price:$39.34Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816301
MOOSE RACING
$20.35A leaking clutch cover gasket compromises both engine integrity and performance—allowing oil seepage that can contaminate your clutch assembly and degrade friction characteristics. The MOOSE RACING Inner Clutch Cover Gasket 816301 is engineered as a...09346149- SKU:
- 09346149
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$20.35 -
MOOSE RACING Inner Clutch Cover Gasket 816306
MOOSE RACING
$13.64A leaking inner clutch cover doesn't just cost you oil—it compromises engine sealing integrity and can lead to contamination of critical drivetrain components. The MOOSE RACING Inner Clutch Cover Gasket 816306 delivers OEM-equivalent sealing performance...09346150- SKU:
- 09346150
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$13.64Qty in Cart: 0Quantity:Price:$13.64Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816315
MOOSE RACING
$28.13A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly what you want to avoid during critical race sessions or long rebuild work. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent...09346151- SKU:
- 09346151
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$28.13 -
MOOSE RACING Water Pump Rebuild Kit 821327
MOOSE RACING
$61.88A failing water pump leads to catastrophic engine overheating and potential catastrophic damage—downtime you can't afford. The MOOSE RACING Water Pump Rebuild Kit 821327 gives you OEM-quality replacement components to restore full cooling system...09345198- SKU:
- 09345198
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$61.88Qty in Cart: 0Quantity:Price:$61.88Subtotal:
