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
-
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4021
MOOSE RACING
$26.95Countershaft seal failure leads to oil contamination, bearing wear, and transmission damage—issues that compromise both reliability and performance on the track or trail. The MOOSE RACING Countershaft Sprocket Seal Kit delivers OEM-quality sealing with...09350446- SKU:
- 09350446
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$26.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4030
MOOSE RACING
$24.95A worn countershaft sprocket seal compromises your engine's reliability and allows contamination into critical drivetrain components. This MOOSE RACING kit delivers OEM-quality sealing with upgraded materials engineered to withstand high-RPM demands and...09350455- SKU:
- 09350455
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
$24.95 -
MOOSE RACING Water Pump Rebuild Kit 821457
MOOSE RACING
$57.51A failing water pump compromises your entire cooling system, risking catastrophic engine damage on the track or street. The MOOSE RACING Water Pump Rebuild Kit 821457 gives you everything needed to restore OEM performance without the cost of a complete...09345222- SKU:
- 09345222
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$57.51 -
MOOSE RACING Water Pump Rebuild Kit 821458
MOOSE RACING
$50.82A failing water pump can silently undermine your engine's thermal management, leading to catastrophic overheating and potential block damage. This MOOSE RACING rebuild kit delivers every gasket, seal, bearing, and snap ring needed to restore your water...09345223- SKU:
- 09345223
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$50.82Qty in Cart: 0Quantity:Price:$50.82Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821459
MOOSE RACING
$45.72A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage. The MOOSE RACING Water Pump Rebuild Kit 821459 gives you everything needed to restore your pump to OEM specification without the downtime and expense of...09345224- SKU:
- 09345224
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- REPAIR KIT
$45.72Qty in Cart: 0Quantity:Price:$45.72Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821460
MOOSE RACING
$57.65A failing water pump can sideline your build or race season—catching problems early with a complete rebuild kit saves you downtime and prevents catastrophic cooling system failures. The MOOSE RACING 821460 rebuild kit supplies every critical gasket,...09345225- SKU:
- 09345225
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$57.65 -
MOOSE RACING Water Pump Rebuild Kit 821463
MOOSE RACING
$64.58A worn water pump can silently undermine engine cooling efficiency, leading to overheating and catastrophic failure during hard track sessions or extended driving. This MOOSE RACING rebuild kit supplies every seal, bearing, gasket, and snap ring needed...09345226- SKU:
- 09345226
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$64.58Qty in Cart: 0Quantity:Price:$64.58Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821465
MOOSE RACING
$64.67A failing water pump compromises your entire cooling system and can lead to catastrophic engine damage on the track or road. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to OEM performance specifications without...09345227- SKU:
- 09345227
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$64.67Qty in Cart: 0Quantity:Price:$64.67Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821469
MOOSE RACING
$55.26A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage. This MOOSE RACING rebuild kit supplies every internal component needed to restore your water pump to OEM specifications without the cost of a full...09345228- SKU:
- 09345228
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$55.26 -
MOOSE RACING Water Pump Rebuild Kit 821482
MOOSE RACING
$55.39A failing water pump compromises your entire cooling system, risking catastrophic engine damage and costly downtime. The MOOSE RACING Water Pump Rebuild Kit 821482 gives you everything needed to restore OEM functionality without the expense of a full...09345232- SKU:
- 09345232
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$55.39 -
MOOSE RACING Exhaust Gasket Kit 823161
MOOSE RACING
$21.87A quality exhaust gasket kit is essential for maintaining a reliable seal between your exhaust manifold and header components—preventing costly exhaust leaks that reduce performance and increase emissions. MOOSE RACING's gasket kit delivers...09345342- SKU:
- 09345342
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
$21.87Qty in Cart: 0Quantity:Price:$21.87Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823162
MOOSE RACING
$21.48Exhaust leaks compromise both performance and reliability, allowing combustion gases to escape before they're properly measured and scavenged. A quality gasket kit seals critical junctions throughout your exhaust system, maintaining backpressure,...09345343- SKU:
- 09345343
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- EXHAUST
- UNITS:
- KIT
$21.48Qty in Cart: 0Quantity:Price:$21.48Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823163
MOOSE RACING
$14.99A leaking exhaust gasket compromises engine sealing, reduces performance efficiency, and can allow exhaust gases to escape before reaching your exhaust system—costing you horsepower and risking engine damage. The MOOSE RACING Exhaust Gasket Kit 823163...09345344- SKU:
- 09345344
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$14.99 -
MOOSE RACING Exhaust Gasket Kit 823164
MOOSE RACING
$14.70A leaking exhaust gasket can compromise your engine's performance, waste fuel, and create diagnostic headaches that ripple through your entire system. MOOSE RACING's Exhaust Gasket Kit 823164 delivers OEM-quality sealing with the durability you need for...09345345- SKU:
- 09345345
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$14.70 -
MOOSE RACING Exhaust Gasket Kit 823165
MOOSE RACING
$14.70A proper seal at your exhaust manifold is non-negotiable for maintaining peak engine performance and preventing costly exhaust leaks. The MOOSE RACING Exhaust Gasket Kit 823165 delivers OEM-quality sealing reliability without the dealership markup,...09345346- SKU:
- 09345346
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$14.70Qty in Cart: 0Quantity:Price:$14.70Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823167
MOOSE RACING
$14.70A leaking exhaust gasket compromises both performance and reliability—allowing combustion gases to escape before they reach your exhaust system, which kills power and creates diagnostic headaches. MOOSE RACING's Exhaust Gasket Kit 823167 delivers...09345348- SKU:
- 09345348
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$14.70 -
MOOSE RACING Exhaust Gasket Kit 823168
MOOSE RACING
$14.99A compromised exhaust gasket allows unmetered air and combustion gases to escape your system, robbing you of power output and creating vacuum leaks that throw off your fuel mixture. The MOOSE RACING Exhaust Gasket Kit 823168 delivers OEM-grade sealing...09345349- SKU:
- 09345349
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$14.99 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808340
MOOSE RACING
$73.12A complete engine and transmission rebuild demands gaskets and seals that match OEM precision without the OEM price tag. This MOOSE RACING kit eliminates multiple part orders by consolidating everything you need into one comprehensive set, letting you...09345353- SKU:
- 09345353
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$73.12 -
MOOSE RACING Valve Shim - 7.48 x 2.60 - 5 pack MSE5PK748260
MOOSE RACING
$9.95Precise valve shim selection is critical for maintaining proper valve train clearance and engine performance across multiple service intervals. These forged 4140 steel shims eliminate guesswork with laser-etched sizing, allowing you to quickly identify...09261886- SKU:
- 09261886
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 2.65 - 5 pack MSE5PK748265
MOOSE RACING
$9.95Proper valve shim selection is critical for maintaining precise valve clearance and preventing costly engine damage from improper adjustment. These MOOSE RACING shims eliminate guesswork during valve train service by providing individually marked,...09261887- SKU:
- 09261887
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.65 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
$9.95
