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 - 8.90 x 2.52 - 5 pack MSE5PK890252
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine performance and longevity—even a few thousandths of an inch off can cause loss of power, increased wear, or catastrophic failure. The MOOSE RACING 8.90 x 2.52 Valve Shim 5-pack gives you a...09261925- SKU:
- 09261925
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.52 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
$10.95 -
MOOSE RACING Valve Shim - 8.90 x 2.56 - 5 pack MSE5PK890256
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. These MOOSE RACING valve shims are forged from 4140 cold rolled steel—not...09261926- SKU:
- 09261926
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.56 MM
- 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
$10.95 -
MOOSE RACING Water Pump Rebuild Kit 821412
MOOSE RACING
$43.28A failing water pump can strand you mid-season or compromise engine temperatures under sustained load. The MOOSE RACING Water Pump Rebuild Kit 821412 gives you a cost-effective alternative to replacing the entire assembly, restoring OEM performance with...09345214- SKU:
- 09345214
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
$43.28 -
MOOSE RACING Water Pump Rebuild Kit 821417
MOOSE RACING
$43.28A failing water pump can compromise your entire cooling system and leave you stranded on track or trail. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap ring needed to restore your water pump to OEM specifications without the...09345215- SKU:
- 09345215
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$43.28 -
MOOSE RACING Water Pump Rebuild Kit 821549
MOOSE RACING
$41.62Water pump failure leaves you stranded—and rebuilding with OEM-quality components is far more cost-effective than replacement. The MOOSE RACING Water Pump Rebuild Kit 821549 supplies every gasket, seal, bearing, and snap ring needed to restore your pump...09345239- SKU:
- 09345239
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$41.62 -
MOOSE RACING Water Pump Rebuild Kit 821550
MOOSE RACING
$41.30A failing water pump compromises your engine's cooling system, risking catastrophic overheating during aggressive track sessions or extended high-performance driving. Rather than replacing the entire unit, this MOOSE RACING rebuild kit restores your...09345240- SKU:
- 09345240
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$41.30 -
MOOSE RACING Water Pump Rebuild Kit 821567
MOOSE RACING
$27.78A failing water pump compromises cooling system integrity and risks catastrophic engine damage. This complete rebuild kit lets you restore your water pump to OEM specifications without the expense of replacing the entire assembly. Whether you're...09345241- SKU:
- 09345241
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.78 -
MOOSE RACING Water Pump Rebuild Kit 821587
MOOSE RACING
$35.70A failing water pump compromises engine cooling efficiency and risks catastrophic overheating. This comprehensive rebuild kit from MOOSE RACING supplies every gasket, seal, bearing, and snap ring needed to restore your water pump to OEM...09345246- SKU:
- 09345246
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$35.70 -
MOOSE RACING Water Pump Rebuild Kit 821590
MOOSE RACING
$38.72A failing water pump can sideline your engine and leave you stranded. This complete rebuild kit from MOOSE RACING includes every gasket, seal, bearing, and O-ring needed to restore your water pump to factory specifications—saving you the cost and...09345247- SKU:
- 09345247
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
$38.72 -
MOOSE RACING Water Pump Rebuild Kit 821593
MOOSE RACING
$36.20A failing water pump can quickly become catastrophic—coolant leaks, overheating, and engine damage happen fast. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to factory performance without the expense of a full...09345248- SKU:
- 09345248
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$36.20Qty in Cart: 0Quantity:Price:$36.20Subtotal: -
MOOSE RACING Head Cover Gasket - Suzuki 817907
MOOSE RACING
$25.91A leaking valve cover gasket compromises engine performance and creates a messy engine bay. OEM gaskets come at premium pricing, but Moose Racing delivers genuine replacement quality at a fraction of the cost. This U.S.-made gasket maintains reliable...09346174- SKU:
- 09346174
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- VALVE COVER
- UNITS:
- EACH
$25.91 -
MOOSE RACING Head Cover Gasket - Kawasaki 817924
MOOSE RACING
$21.00A leaking valve cover gasket compromises engine bay cleanliness and can lead to oil contamination if left unaddressed. The MOOSE RACING Head Cover Gasket delivers OEM-equivalent sealing performance at a fraction of dealer pricing, allowing you to rebuild...09346175- SKU:
- 09346175
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
- TYPE:
- VALVE COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$21.00 -
MOOSE RACING Outer Clutch Cover Gasket 817928
MOOSE RACING
$6.91A leaking clutch cover gasket compromises engine sealing and invites oil contamination into your drivetrain—exactly what your performance build doesn't need. The MOOSE RACING Outer Clutch Cover Gasket delivers OEM-equivalent sealing at a fraction of OEM...09346176- SKU:
- 09346176
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$6.91Qty in Cart: 0Quantity:Price:$6.91Subtotal: -
MOOSE RACING Outer Clutch Cover Gasket 817930
MOOSE RACING
$6.76A failing clutch cover gasket compromises engine sealing and invites oil leakage into your ignition system—exactly what you don't need mid-race or mid-rebuild. The MOOSE RACING 817930 delivers OEM-equivalent sealing performance at a fraction of the cost,...09346177- SKU:
- 09346177
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$6.76 -
MOOSE RACING Head Cover Gasket - Honda 817932
MOOSE RACING
$18.41Factory valve cover gaskets command premium pricing, but Moose Racing delivers OEM-quality seals at a fraction of the cost. This head cover gasket maintains a reliable seal under engine heat and pressure cycles, preventing oil leakage that can compromise...09346179- SKU:
- 09346179
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- VALVE COVER
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$18.41 -
MOOSE RACING Outer Clutch Cover Gasket 817943
MOOSE RACING
$10.87A leaking clutch cover gasket compromises engine sealing and invites oil contamination into critical drivetrain components. The MOOSE RACING Outer Clutch Cover Gasket 817943 delivers OEM-equivalent fitment and reliability at a fraction of OEM pricing,...09346180- SKU:
- 09346180
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$10.87Qty in Cart: 0Quantity:Price:$10.87Subtotal: -
MOOSE RACING Head Cover Gasket - Suzuki 817961
MOOSE RACING
$28.34OEM valve cover gaskets come with premium pricing and unnecessary complexity. The Moose Racing Head Cover Gasket delivers genuine OEM-level sealing performance at a fraction of the cost, allowing you to rebuild your engine without compromise. Whether...09346182- SKU:
- 09346182
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- VALVE COVER
- UNITS:
- EACH
$28.34Qty in Cart: 0Quantity:Price:$28.34Subtotal: -
MOOSE RACING Gasket Set with Seals - Yamaha 811977
MOOSE RACING
$133.72Engine gasket sets are critical for maintaining compression, preventing fluid leaks, and ensuring reliable performance—especially in high-demand racing applications where even minor seal failures can sideline your machine. The MOOSE RACING Gasket Set...09346929- SKU:
- 09346929
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
$133.72 -
MOOSE RACING Gasket Clutch Inner - Yamaha 816082
MOOSE RACING
$13.91A worn or damaged clutch gasket compromises your engine's sealing integrity, leading to oil leaks and potential power loss—especially critical in high-rpm racing environments. The MOOSE RACING Gasket Clutch Inner is engineered to restore a factory-tight...09346930- SKU:
- 09346930
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
$13.91 -
MOOSE RACING Gasket Clutch Inner - Yamaha 816150
MOOSE RACING
$11.64A failing clutch gasket can compromise your entire drivetrain's integrity, leading to fluid leaks, loss of pressure, and catastrophic clutch failure at the worst possible moment. The MOOSE RACING Gasket Clutch Inner delivers OEM-equivalent sealing with...09346932- SKU:
- 09346932
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
- UNITS:
- EACH
$11.64
