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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Water Pump Rebuild Kit 821579
MOOSE RACING
$53.59A failing water pump can rapidly escalate into catastrophic engine damage—and a complete replacement isn't always necessary. The MOOSE RACING Water Pump Rebuild Kit 821579 gives you a cost-effective...09345243- SKU:
- 09345243
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$53.59 -
MOOSE RACING Water Pump Rebuild Kit 821581
MOOSE RACING
$54.07A failed water pump doesn't just leave you stranded—it can cause catastrophic engine damage in minutes. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to OEM...09345244- SKU:
- 09345244
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$54.07 -
MOOSE RACING Water Pump Rebuild Kit 821614
MOOSE RACING
$42.36A failing water pump doesn't just risk overheating—it can strand you trackside or worse. The MOOSE RACING Water Pump Rebuild Kit 821614 gives you a complete set of OEM-quality replacement components...09345252- SKU:
- 09345252
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$42.36 -
MOOSE RACING Water Pump Rebuild Kit 821670
MOOSE RACING
$40.11A failing water pump can leave you stranded mid-season and compromise your engine's thermal stability when you need it most. This MOOSE RACING rebuild kit delivers all the OEM-grade components needed...09345260- SKU:
- 09345260
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$40.11 -
MOOSE RACING Water Pump Rebuild Kit 821671
MOOSE RACING
$56.35A failing water pump compromises engine cooling efficiency and risks catastrophic overheating—especially under racing conditions or sustained high-performance driving. This complete rebuild kit from...09345261- SKU:
- 09345261
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- ENGINE TYPE:
- 4-STROKE
$56.35 -
MOOSE RACING Exhaust Gasket Kit 823120
MOOSE RACING
$16.37A compromised exhaust gasket leads to performance loss, exhaust leaks, and potential engine damage—issues that compound quickly on high-performance builds. The MOOSE RACING Exhaust Gasket Kit 823120...09345319- SKU:
- 09345319
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
$16.37 -
MOOSE RACING Exhaust Gasket Kit 823142
MOOSE RACING
$21.48A quality exhaust gasket kit is essential for maintaining a proper seal between exhaust manifold and header components, preventing dangerous exhaust leaks that compromise both performance and safety...09345324- SKU:
- 09345324
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823143
MOOSE RACING
$21.87Exhaust system integrity directly impacts engine performance and longevity. A compromised gasket seal allows unburned gases to escape before the exhaust reaches your catalytic converter and muffler,...09345325- SKU:
- 09345325
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823151
MOOSE RACING
$21.87A leaking exhaust manifold gasket will rob your engine of power, increase emissions, and create persistent noise that signals trouble to anyone within earshot. MOOSE RACING's Exhaust Gasket Kit...09345333- SKU:
- 09345333
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823154
MOOSE RACING
$21.87Exhaust gasket failure is one of the most common causes of performance loss and reliability issues in high-revving engines. A degraded or blown gasket allows exhaust gases to escape before reaching...09345335- SKU:
- 09345335
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823156
MOOSE RACING
$13.64A proper exhaust seal is fundamental to engine performance and longevity. Worn or damaged gaskets cause exhaust leaks that rob horsepower, increase emissions, and allow unburned fuel to escape. The...09345337- SKU:
- 09345337
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$13.64 -
MOOSE RACING Exhaust Gasket Kit 823158
MOOSE RACING
$21.87A leaking exhaust gasket compromises both performance and reliability, allowing unmetered gases to escape and creating diagnostic headaches. MOOSE RACING's Exhaust Gasket Kit 823158 delivers...09345339- SKU:
- 09345339
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823159
MOOSE RACING
$21.87A leaking exhaust gasket compromises engine sealing, increases emissions, and wastes horsepower—problems that cascade into costly engine damage if left unchecked. The MOOSE RACING Exhaust Gasket Kit...09345340- SKU:
- 09345340
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$21.87 -
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...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...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...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...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...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...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...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
