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 1.72 - 5 pack MSE5PK890172
MOOSE RACING
$10.95Maintaining precise valve clearances is critical to engine reliability and performance—even a few thousandths of an inch out of spec can cause valve float, burned seats, or catastrophic failure. MOOSE RACING valve shims give you the direct control needed...09261905- SKU:
- 09261905
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- 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:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.72 MM
$10.95 -
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 Valve Shim - 8.90 x 1.88 - 5 pack MSE5PK890188
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance, longevity, and reliability—and getting it right starts with precision shims. This 5-pack of MOOSE RACING valve shims ensures you have the exact sizes needed for accurate valve train adjustment,...09261909- SKU:
- 09261909
- 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
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.88 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
MOOSE RACING Inner Clutch Gasket 816289
MOOSE RACING
$24.68A failing clutch gasket compromises engine sealing and creates oil weepage that undermines reliability during high-demand racing or extended track sessions. The MOOSE RACING Inner Clutch Gasket 816289 delivers OEM-quality sealing performance at a...09346144- SKU:
- 09346144
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$24.68Qty in Cart: 0Quantity:Price:$24.68Subtotal: -
MOOSE RACING Ignition Cover Gasket 816290
MOOSE RACING
$16.37A failing ignition cover gasket compromises engine sealing and can lead to oil leakage, contamination, and potential ignition system damage. The MOOSE RACING 816290 delivers OEM-quality sealing performance with reliable durability, ensuring your engine...09346145- SKU:
- 09346145
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$16.37 -
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 821332
MOOSE RACING
$57.18A failing water pump can compromise engine cooling and lead to catastrophic overheating—rebuilding yours with OEM-quality components is far more cost-effective than replacing the entire unit. This comprehensive rebuild kit from MOOSE Racing supplies...09345200- SKU:
- 09345200
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$57.18Qty in Cart: 0Quantity:Price:$57.18Subtotal: -
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
$43.80Qty in Cart: 0Quantity:Price:$43.80Subtotal: -
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
