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 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 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 M96-96460
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 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 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 -
MOOSE RACING Ring Set - For 90 mm Piston CPN2-3543
MOOSE RACING
$35.95A quality ring set is fundamental to engine reliability and performance—it's what seals combustion pressure and controls oil consumption in your cylinder. The MOOSE RACING Ring Set for 90 mm pistons...09120333- SKU:
- 09120333
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- UNITS:
- SET
$35.95 -
MOOSE RACING Connecting Rod MR13187
MOOSE RACING
$474.95A connecting rod is the critical link between your piston and crankshaft—it must be strong enough to handle peak combustion forces while light enough to minimize parasitic drag on engine response...09230621- SKU:
- 09230621
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- PRODUCT NAME:
- CONNECTING ROD
- STYLE:
- HIGH PERFORMANCE
- MATERIAL:
- PROPRIETARY ALLOY
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$474.95 -
MOOSE RACING Piston Kit - 66.36 mm MSE22521B
MOOSE RACING
$203.65A piston kit engineered for durability and extended service life, the MOOSE RACING MSE22521B combines gravity-cast aluminum with 18% silicon content to resist wear and thermal distortion under...09102679- SKU:
- 09102679
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON DIAMETER METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$203.65 -
MOOSE RACING Cylinder - Standard MSECW20013
MOOSE RACING
$364.95A worn or damaged cylinder compromises compression, efficiency, and overall engine reliability—especially under racing conditions. The MOOSE RACING Standard Cylinder restores your engine to OEM...09310968- SKU:
- 09310968
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- BORE SIZE METRIC:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$364.95 -
MOOSE RACING Cylinder - Standard - CRF250 MSECW10011
MOOSE RACING
$338.95When your CRF250 cylinder shows signs of wear—scoring, compression loss, or thermal stress—a direct OEM replacement restores the reliability and performance your engine demands. This MOOSE RACING...09310878- SKU:
- 09310878
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
$338.95 -
MOOSE RACING Intake Valve Kit M30-31200
MOOSE RACING
$217.95OEM intake valves wear out—especially under sustained high-RPM operation. The MOOSE RACING Intake Valve Kit M30-31200 replaces them with stainless steel Black Diamond valves that deliver up to 4x...09262427- SKU:
- 09262427
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$217.95 -
MOOSE RACING Intake Valve Kit M30-31230
MOOSE RACING
$196.95Extended valve life directly translates to reduced maintenance costs and more consistent performance over thousands of miles—critical for both race applications and high-demand street engines. MOOSE...09262429- SKU:
- 09262429
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95 -
MOOSE RACING Intake Valve Kit M80-82350
MOOSE RACING
$196.95OEM titanium intake valves wear out and require frequent replacement—stainless steel conversion eliminates that cycle. The MOOSE RACING Black Diamond intake valves extend valve train life by up to 4x...09263192- SKU:
- 09263192
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
$196.95 -
MOOSE RACING Valve and Spring Kit M80-82360
MOOSE RACING
$196.95Factory titanium intake valves wear faster and restrict flow potential in high-performance applications. The MOOSE RACING Valve and Spring Kit M80-82360 replaces them with stainless steel Black...09263193- SKU:
- 09263193
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95
