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 Crankcase Bearing and Seal Kit 24-1030
MOOSE RACING
$83.95A quality crankcase bearing and seal kit is foundational to reliable engine performance—worn bearings introduce play, noise, and premature wear that cascades through your entire drivetrain. The MOOSE RACING 24-1030 kit delivers precision-engineered...A241030- SKU:
- A241030
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$83.95 -
MOOSE RACING Crank Bearing - XR/TRX 24-1031
MOOSE RACING
$37.95Your 2-stroke engine's crankshaft depends on precision bearings to handle extreme rotational forces—and worn or inadequate bearings will cost you performance and reliability. The MOOSE RACING Crank Bearing Kit (24-1031) delivers OEM-grade precision...A241031- SKU:
- A241031
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- RIDING STYLE:
- ATV
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- BALL
$37.95 -
MOOSE RACING Valve Shim - 8.90 x 1.96 - 5 pack MSE5PK890196
MOOSE RACING
$10.95Valve train maintenance demands precision, and these MOOSE RACING shims eliminate guesswork during adjustment procedures. Forged from 4140 cold rolled steel rather than sintered material, they deliver superior durability and repeatability across multiple...09261911- SKU:
- 09261911
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.96 MM
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
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 guesswork during adjustments with laser-etched sizing,...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 the durability and dimensional accuracy required for...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
$10.95 -
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 specifications. Whether you're rebuilding a top-end or...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
$10.95 -
MOOSE RACING Valve Shim - 8.90 x 2.20 - 5 pack MSE5PK890220
MOOSE RACING
$10.95Precision 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 clearances every time you dial in your engine. Forged...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
$10.95 -
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 shims are forged from 4140 cold rolled steel—not...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 forged from 4140 cold-rolled steel—not sintered—giving...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
$9.95Valve 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 valve train, ensuring consistent performance across...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
$9.95 -
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 rolled steel rather than sintered material, they deliver...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
$9.95 -
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 tight tolerances and won't degrade over multiple heat...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
$9.95 -
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 performance at a fraction of OEM pricing, using high-tech...09346137- SKU:
- 09346137
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$17.74 -
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 OEM-equivalent sealing performance at a fraction of OEM pricing,...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 outlast inferior aftermarket options. Whether you're...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 OEM-equivalent sealing performance at a fraction of OEM pricing,...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 at a fraction of the cost, using high-tech materials...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
$9.95Precision 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 during valve train service, with laser-etched sizing that...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
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.75 - 5 pack MSE5PK748175
MOOSE RACING
$9.95Proper 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 guesswork during valve train setup and adjustment, ensuring...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
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.80 - 5 pack MSE5PK748180
MOOSE RACING
$9.95Maintaining 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 shims are forged from 4140 cold-rolled steel,...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
$9.95
