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 Seal Kit M30-31530
MOOSE RACING
$15.95Valve seal degradation is one of the most common culprits behind oil consumption, reduced compression, and failed inspections—especially under high-boost or sustained high-RPM conditions. The MOOSE...09262818- SKU:
- 09262818
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M60-60570
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of compression loss and oil consumption in high-mileage engines. The MOOSE RACING Valve Seal Kit M60-60570 replaces worn OEM seals with...09262827- SKU:
- 09262827
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M60-60870
MOOSE RACING
$15.95Valve seals are critical to engine longevity—they prevent oil from leaking into the combustion chamber and maintain compression integrity. Over time, OEM seals degrade under heat and pressure,...09262829- SKU:
- 09262829
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- VITON
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M80-80880
MOOSE RACING
$15.95Valve seal degradation causes oil blow-by, compression loss, and increased emissions—problems that compound quickly under racing conditions or high-mileage use. The MOOSE RACING M80-80880 Valve Seal...09262832- SKU:
- 09262832
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve and Spring Kit M30-31860
MOOSE RACING
$217.95If you're running high-mileage racing applications, OEM valve and spring components become a reliability liability. The MOOSE RACING M30-31860 addresses this with Black Diamond stainless steel intake...09262435- SKU:
- 09262435
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95 -
MOOSE RACING Valve and Spring Kit M30-31960
MOOSE RACING
$196.95If you're running high-mileage on OEM titanium valves, you're leaving performance and reliability on the table. The MOOSE RACING Valve and Spring Kit M30-31960 replaces worn intake components with...09262436- SKU:
- 09262436
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95 -
MOOSE RACING Intake Valve Kit M40-40350
MOOSE RACING
$196.95Stock intake valves are a limiting factor in any high-performance engine build, prone to premature wear and thermal fatigue under sustained boost or high RPM loads. The MOOSE RACING M40-40350 Intake...09262439- SKU:
- 09262439
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$196.95 -
MOOSE RACING Valve and Spring Kit M80-80860
MOOSE RACING
$217.95Factory valve trains wear out—MOOSE Racing's stainless steel conversion kit extends intake valve life by up to 4x over OEM titanium components while improving flow and performance. If you're serious...09262458- SKU:
- 09262458
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$217.95 -
MOOSE RACING Intake Valve Kit M80-81050
MOOSE RACING
$196.95If you're running a high-performance engine, your intake valves are working harder than factory components were designed to handle. The MOOSE RACING Intake Valve Kit M80-81050 replaces OEM titanium...09262461- SKU:
- 09262461
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95Qty in Cart: 0Quantity:Price:$196.95Subtotal: -
MOOSE RACING Valve and Spring Kit M80-81060
MOOSE RACING
$196.95OEM titanium intake valves wear out fast under high-performance demands, limiting your engine's lifespan and reliability. The MOOSE RACING Valve and Spring Kit M80-81060 replaces them with stainless...09262462- SKU:
- 09262462
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$196.95Qty in Cart: 0Quantity:Price:$196.95Subtotal: -
MOOSE RACING Intake Valve Kit M96-96070
MOOSE RACING
$196.95If you're running hard on the track or pushing your engine to its limits, your intake valves are working overtime. The MOOSE RACING Intake Valve Kit M96-96070 replaces your stock titanium valves with...09262463- SKU:
- 09262463
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$196.95 -
MOOSE RACING Valve and Spring Kit M96-96360
MOOSE RACING
$196.95If you're running a high-performance engine, your valve train is under constant stress—and OEM titanium valves often become the limiting factor in reliability and longevity. The MOOSE RACING Valve...09262464- SKU:
- 09262464
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
$196.95Qty in Cart: 0Quantity:Price:$196.95Subtotal: -
MOOSE RACING Valve and Spring Kit M96-96460
MOOSE RACING
$217.95If you're running high-mileage or high-performance applications, OEM titanium intake valves will eventually become a reliability bottleneck. The MOOSE RACING Valve and Spring Kit M96-96460 replaces...09262468- SKU:
- 09262468
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$217.95 -
MOOSE RACING Cylinder - Standard - KTM MSE50003
MOOSE RACING
$474.95A worn or damaged cylinder directly compromises compression, power delivery, and engine longevity. The MOOSE RACING Cylinder restores your engine to factory specifications with precision...09310627- SKU:
- 09310627
- Availability:
- Ships Same Business Day
- Weight:
- 2.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- CAST
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
$474.95 -
MOOSE RACING Cylinder - Standard - YZ250F MSE20010
MOOSE RACING
$402.95A worn or damaged cylinder directly impacts engine compression, throttle response, and overall reliability on the track or trail. The MOOSE RACING Cylinder restores OEM performance specifications...09310629- SKU:
- 09310629
- Availability:
- Ships Same Business Day
- Weight:
- 2.26 LBS
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$402.95Qty in Cart: 0Quantity:Price:$402.95Subtotal: -
MOOSE RACING Cylinder - Standard MSE10002
MOOSE RACING
$372.95A worn or damaged cylinder compromises compression, increases blow-by, and forces your engine to work harder while delivering less power. The MOOSE RACING MSE10002 restores your engine to factory...09310442- SKU:
- 09310442
- Availability:
- Ships Same Business Day
- Weight:
- 3.51 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- CAST
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
$372.95 -
MOOSE RACING Cylinder - Standard MSE10007
MOOSE RACING
$377.95A worn or damaged cylinder directly compromises your engine's compression, power delivery, and reliability—especially in high-performance applications. The MOOSE RACING MSE10007 cylinder restores...09310447- SKU:
- 09310447
- Availability:
- Ships Same Business Day
- Weight:
- 2.66 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$377.95Qty in Cart: 0Quantity:Price:$377.95Subtotal: -
MOOSE RACING Cylinder - Standard MSE20002
MOOSE RACING
$366.95A worn or damaged cylinder directly impacts compression, power delivery, and engine reliability—making replacement essential for any serious racer or mechanic. The MOOSE RACING MSE20002 delivers...09310451- SKU:
- 09310451
- Availability:
- Ships Same Business Day
- Weight:
- 2.93 LBS
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$366.95 -
MOOSE RACING Cylinder - Standard MSE20003
MOOSE RACING
$380.95A worn or damaged cylinder directly compromises compression, power delivery, and engine reliability—especially under racing conditions. The MOOSE RACING MSE20003 restores OEM performance with a...09310452- SKU:
- 09310452
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$380.95 -
MOOSE RACING Wrist Pin - DLC S748-2000-15C
MOOSE RACING
$66.95A wrist pin is the critical pivot point connecting your piston to the connecting rod—it's one of the highest-stress components in your engine. The MOOSE RACING S748-2000-15C uses a DLC (Diamond-Like...09130095- SKU:
- 09130095
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 4-STROKE
- UNITS:
- EACH
- APPLICATION:
- PISTON
- PRODUCT NAME:
- WRIST PIN
$66.95
