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 Shim - 9.48 x 3.05 - 5 pack MSE5PK948305
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity, and having the right sizes on hand prevents costly downtime during top-end rebuilds. These Moose Racing shims are forged from 4140 cold rolled steel—not sintered—giving you the durability and...09261965- SKU:
- 09261965
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 3.05 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.10 - 5 pack MSE5PK948310
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity and performance, and having the correct sizes on hand eliminates guesswork during valve train service. These MOOSE RACING shims are forged from 4140 cold rolled steel—a material that resists...09261966- SKU:
- 09261966
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.10 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.40 - 5 pack MSE5PK948340
MOOSE RACING
$9.95Valve shim maintenance demands precision and reliability—guesswork has no place in your valve train. These forged 4140 cold rolled steel shims give you the durability and accuracy needed to dial in proper valve clearances without the brittleness or...09261972- SKU:
- 09261972
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 3.40 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Seal Kit M30-30550
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of oil consumption and compression loss in high-mileage engines—issues that compound quickly under racing conditions or sustained performance driving. The MOOSE RACING M30-30550 Valve Seal Kit...09262815- SKU:
- 09262815
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$15.95 -
MOOSE RACING Valve Seal Kit M30-30680
MOOSE RACING
$15.95Valve seal degradation leads to oil consumption, blow-by, and performance loss—especially under sustained high RPM operation. The MOOSE RACING Valve Seal Kit M30-30680 replaces worn OEM seals with precision-engineered components that maintain proper oil...09262816- SKU:
- 09262816
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
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 RACING Valve Seal Kit M30-31530 replaces compromised OEM...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
$15.95 -
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, leading to oil consumption, blue smoke, and reduced...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
$15.95 -
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 valves engineered to deliver up to 4x longer service...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 stainless steel Black Diamond valves engineered to...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 Valve Kit replaces OEM titanium components with...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 about maximizing engine longevity and reliability in...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 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 steel Black Diamond valves that last up to 4x longer...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
$196.95 -
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 premium stainless steel Black Diamond valves that...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 and Spring Kit M96-96360 replaces those components with...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
$196.95 -
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 them with stainless steel Black Diamond valves...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 manufacturing and a durable nickel silicon carbide-plated bore that...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 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 performance specifications with precision engineering and...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 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 OEM-spec performance with superior durability, restoring...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 precision-honed bore and advanced nickel silicon carbide...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 Carbon) nitride coating to deliver a hardened,...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
