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 Exhaust Gasket Kit 823160
MOOSE RACING
$21.87A proper exhaust gasket seal is critical to maintaining peak engine performance and preventing costly exhaust leaks that rob horsepower and create unwanted noise. The MOOSE RACING Exhaust Gasket Kit 823160 provides OEM-quality gaskets engineered to...09345341- SKU:
- 09345341
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
$21.87 -
MOOSE RACING Ignition Cover Gasket 816347
MOOSE RACING
$14.45A leaking ignition cover gasket can compromise engine sealing and lead to oil weeping that damages surrounding components. MOOSE RACING's OEM-equivalent gasket delivers precise fitment and lasting durability at a fraction of OEM pricing, making it the...09346591- SKU:
- 09346591
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
$14.45 -
MOOSE RACING Valve Shim - 7.48 x 3.10 - 5 pack MSE5PK748310
MOOSE RACING
$9.95Precision valve train maintenance demands accurate, reliable shims that won't let you down mid-season. MOOSE Racing valve shims are forged from 4140 cold rolled steel—not sintered—giving you the durability and dimensional consistency that professional...09261896- SKU:
- 09261896
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.10 MM
- 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
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.15 - 5 pack MSE5PK748315
MOOSE RACING
$9.95Valve shim maintenance is critical to maintaining proper valve clearance and preventing costly engine damage from improper adjustment. This complete 5-pack from MOOSE Racing gives you the refill shims you need to dial in your valve train without buying...09261897- SKU:
- 09261897
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.15 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.20 - 5 pack MSE5PK748320
MOOSE RACING
$9.95Precision valve shim sets are essential for maintaining proper valve clearance and ensuring optimal engine performance across your entire valve train. These MOOSE RACING shims eliminate guesswork during valve adjustments by providing accurately sized,...09261898- SKU:
- 09261898
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- VALVE SHIM THICKNESS METRIC:
- 3.20 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.25 - 5 pack MSE5PK748325
MOOSE RACING
$9.95Maintaining precise valve clearances is essential for engine performance, reliability, and longevity—and having the right shims on hand eliminates guesswork during valve train adjustments. MOOSE Racing valve shims are forged from 4140 cold rolled steel...09261899- SKU:
- 09261899
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 3.25 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
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.35 - 5 pack MSE5PK748335
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity, and having the right shims on hand eliminates downtime during valve train service. MOOSE RACING valve shims are forged from 4140 cold rolled steel—a material choice...09261901- SKU:
- 09261901
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- 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:
- 3.35 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 8.90 x 1.80 - 5 pack MSE5PK890180
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine performance and longevity—improper shim selection leads to valve float, reduced power, and potential engine damage. These MOOSE RACING valve shims eliminate guesswork during valve train service,...09261907- SKU:
- 09261907
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.80 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$10.95 -
MOOSE RACING Inner Clutch Gasket 816291
MOOSE RACING
$24.68A leaking clutch gasket compromises both performance and engine longevity—oil seepage leads to clutch slippage, reduced engagement, and potential internal damage. The MOOSE RACING Inner Clutch Gasket delivers OEM-equivalent sealing with precision...09346146- SKU:
- 09346146
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$24.68 -
MOOSE RACING Ignition Cover Gasket 816292
MOOSE RACING
$13.64A leaking ignition cover gasket can compromise engine sealing and lead to oil weeping that attracts dirt and debris. The MOOSE RACING Ignition Cover Gasket 816292 delivers reliable sealing performance with OEM-grade construction, ensuring your engine...09346147- SKU:
- 09346147
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$13.64 -
MOOSE RACING Water Pump Rebuild Kit 821335
MOOSE RACING
$43.80A failing water pump compromises engine cooling and puts your entire build at risk. This MOOSE RACING rebuild kit supplies every seal, bearing, and gasket needed to restore your water pump to OEM specifications without sourcing components individually...09345201- SKU:
- 09345201
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$43.80 -
MOOSE RACING Water Pump Rebuild Kit 821336
MOOSE RACING
$40.40A failing water pump compromises cooling system integrity and risks catastrophic engine damage. The MOOSE RACING Water Pump Rebuild Kit 821336 provides all OEM-equivalent components needed to restore your pump to factory specifications without replacing...09345202- SKU:
- 09345202
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$40.40 -
MOOSE RACING Water Pump Rebuild Kit 821337
MOOSE RACING
$56.40A failing water pump doesn't just compromise cooling efficiency—it puts your engine at risk of catastrophic overheating. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to OEM specifications without the expense of a...09345203- SKU:
- 09345203
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$56.40 -
MOOSE RACING Water Pump Rebuild Kit 821338
MOOSE RACING
$58.35A failing water pump compromises your entire cooling system, risking catastrophic engine damage during competition or extended operation. The MOOSE RACING Water Pump Rebuild Kit 821338 delivers all necessary internal components—bearings, seals, gaskets,...09345204- SKU:
- 09345204
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$58.35 -
MOOSE RACING Water Pump Rebuild Kit 821339
MOOSE RACING
$42.52A failing water pump can compromise your entire cooling system, leaving you stranded on the track or trail. This comprehensive rebuild kit from MOOSE RACING supplies every critical component—bearings, seals, gaskets, and snap rings—needed to restore your...09345205- SKU:
- 09345205
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$42.52 -
MOOSE RACING Water Pump Rebuild Kit 821342
MOOSE RACING
$51.32A failing water pump compromises your entire cooling system, risking catastrophic engine damage and costly downtime. This comprehensive rebuild kit from MOOSE RACING eliminates the guesswork by including every critical component needed for a complete...09345206- SKU:
- 09345206
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$51.32 -
MOOSE RACING Water Pump Rebuild Kit 821343
MOOSE RACING
$56.27A failing water pump compromises your engine's cooling system and can lead to catastrophic overheating during competition or high-load driving. The MOOSE RACING Water Pump Rebuild Kit 821343 gives you everything needed to restore pump integrity without...09345207- SKU:
- 09345207
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$56.27 -
MOOSE RACING Exhaust Gasket Kit 823003
MOOSE RACING
$9.53A quality exhaust gasket kit is essential for maintaining a proper seal between exhaust manifold and header connections, preventing exhaust leaks that rob horsepower and create unwanted noise. MOOSE RACING's 823003 kit delivers OEM-grade gaskets that...09345273- SKU:
- 09345273
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- EXHAUST
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$9.53 -
MOOSE RACING Exhaust Gasket Kit 823050
MOOSE RACING
$8.13Exhaust gasket failure leads to performance loss, increased emissions, and costly engine damage—often going unnoticed until catastrophic failure occurs. A quality gasket kit seals your exhaust manifold and header connections under extreme thermal...09345276- SKU:
- 09345276
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
$8.13 -
MOOSE RACING Exhaust Gasket Kit 823051
MOOSE RACING
$8.13A properly sealed exhaust system is critical to maintaining engine performance and preventing power loss from exhaust leaks. The MOOSE RACING Exhaust Gasket Kit 823051 delivers OEM-quality sealing across all exhaust manifold and header connections,...09345277- SKU:
- 09345277
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$8.13
