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
-
MOOSE RACING Valve Shim - 8.90 x 2.00 - 5 pack MSE5PK890200
MOOSE RACING
$10.95Proper valve shim selection is critical for maintaining precise valve clearances and ensuring consistent engine performance across your entire valve train. These forged 4140 steel shims eliminate...09261912- SKU:
- 09261912
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$10.95 -
MOOSE RACING Valve Shim - 8.90 x 2.04 - 5 pack MSE5PK890204
MOOSE RACING
$10.95Valve shim maintenance is critical to engine longevity, and having precision shims on hand eliminates downtime when clearance adjustments are needed. MOOSE RACING's forged 4140 steel shims deliver...09261913- SKU:
- 09261913
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.04 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 2.12 - 5 pack MSE5PK890212
MOOSE RACING
$10.95Precision valve train maintenance starts with the right shims. These MOOSE RACING valve shims eliminate guesswork during adjustment and clearance work, ensuring your valve train operates within exact...09261915- SKU:
- 09261915
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- SNOW
- VALVE SHIM THICKNESS METRIC:
- 2.12 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 2.20 - 5 pack MSE5PK890220
MOOSE RACING
$11.95Precision valve train maintenance demands reliable, accurately-sized shims that you can trust. This 5-pack of MOOSE RACING valve shims eliminates guesswork during valve adjustments, ensuring proper...09261917- SKU:
- 09261917
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.20 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$11.95 -
MOOSE RACING Valve Shim - 9.48 x 1.20 - 5 pack MSE5PK948120
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity, and having quality shims on hand ensures you can make adjustments quickly without downtime. MOOSE Racing valve...09261928- SKU:
- 09261928
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- 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
- RIDING STYLE:
- SNOW
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 1.25 - 5 pack MSE5PK948125
MOOSE RACING
$9.95Maintaining proper valve clearances is critical to engine reliability and performance, and having precision shims on hand eliminates downtime during valve train service. MOOSE RACING valve shims are...09261929- SKU:
- 09261929
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- VALVE SHIM THICKNESS METRIC:
- 1.25 MM
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 1.30 - 5 pack MSE5PK948130
MOOSE RACING
$10.95Valve shim maintenance is critical for maintaining precise valve clearances and extending engine longevity. This 5-pack of MOOSE RACING valve shims eliminates the guesswork when you're adjusting your...09261930- SKU:
- 09261930
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.30 MM
$10.95 -
MOOSE RACING Valve Shim - 9.48 x 1.35 - 5 pack MSE5PK948135
MOOSE RACING
$9.95Precision valve shim maintenance requires reliable, accurately-sized components—these MOOSE RACING shims eliminate guesswork with laser-etched identification on each piece. Forged from 4140 cold...09261931- SKU:
- 09261931
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- 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:
- 1.35 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 9.48 x 1.40 - 5 pack MSE5PK948140
MOOSE RACING
$9.95Valve shim maintenance is critical to precise valve train geometry, and having the correct sizes on hand eliminates guesswork during adjustments. MOOSE RACING's forged 4140 steel shims are built to...09261932- SKU:
- 09261932
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.40 MM
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816274
MOOSE RACING
$17.74A failing clutch cover gasket compromises engine sealing and invites oil leakage that can damage surrounding components. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing...09346137- SKU:
- 09346137
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$17.74Qty in Cart: 0Quantity:Price:$17.74Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816281
MOOSE RACING
$16.37A failing clutch cover gasket compromises your engine's oil containment and invites costly leaks that can damage surrounding components. The MOOSE RACING Inner Clutch Cover Gasket delivers...09346138- SKU:
- 09346138
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$16.37 -
MOOSE RACING Inner Clutch Cover Gasket 816282
MOOSE RACING
$15.18A leaking clutch cover gasket compromises both performance and engine longevity—this OEM-spec replacement from Moose Racing seals critical contact points with precision-engineered materials that...09346139- SKU:
- 09346139
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$15.18 -
MOOSE RACING Inner Clutch Cover Gasket 816285
MOOSE RACING
$15.18A failing clutch cover gasket compromises engine sealing and invites costly oil leaks that can damage bearings and internal components. The MOOSE RACING Inner Clutch Cover Gasket delivers...09346140- SKU:
- 09346140
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$15.18 -
MOOSE RACING Outer Clutch Cover Gasket 816286
MOOSE RACING
$13.64A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination over time. The MOOSE RACING Outer Clutch Cover Gasket delivers OEM-equivalent sealing performance...09346141- SKU:
- 09346141
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$13.64Qty in Cart: 0Quantity:Price:$13.64Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 1.70 - 5 pack MSE5PK748170
MOOSE RACING
$10.95Precision valve shim selection is critical for maintaining proper valve clearance and engine performance across multiple heat cycles. These forged 4140 cold-rolled steel shims eliminate guesswork...09261868- SKU:
- 09261868
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.70 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.75 - 5 pack MSE5PK748175
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance, fuel efficiency, and component longevity—and maintaining it requires the right shims on hand. These MOOSE RACING valve shims eliminate...09261869- SKU:
- 09261869
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.75 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.80 - 5 pack MSE5PK748180
MOOSE RACING
$10.95Maintaining proper valve clearance is critical for engine performance, longevity, and reliability—and having the right shims on hand eliminates downtime during valve train service. MOOSE Racing valve...09261870- SKU:
- 09261870
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 1.80 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 1.85 - 5 pack MSE5PK748185
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine performance and longevity—even a few thousandths of an inch off tolerance can cost you horsepower and reliability. The MOOSE RACING Valve...09261871- SKU:
- 09261871
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.85 MM
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.40 - 5 pack MSE5PK748240
MOOSE RACING
$10.95Valve shim maintenance doesn't have to mean hunting through unmarked hardware. These MOOSE RACING shims eliminate guesswork with laser-etched sizing, so you can quickly identify the right spec and...09261882- SKU:
- 09261882
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 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
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.45 - 5 pack MSE5PK748245
MOOSE RACING
$10.95Maintaining precise valve clearances is critical for consistent performance and engine longevity—and these MOOSE RACING shims give you the durability and accuracy to dial in your valve train without...09261883- SKU:
- 09261883
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
$10.95
