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 Crankcase Bearing and Seal Kit 24-1003
MOOSE RACING
$77.95A worn or damaged crankshaft bearing is a ticking time bomb for engine reliability. The MOOSE RACING Crankcase Bearing and Seal Kit 24-1003 delivers OEM-quality precision bearings engineered to...A241003- SKU:
- A241003
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- UNITS:
- KIT
$77.95Qty in Cart: 0Quantity:Price:$77.95Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821585
MOOSE RACING
$76.89A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage and race-ending downtime. The MOOSE RACING Water Pump Rebuild Kit 821585 gives you everything...09345245- SKU:
- 09345245
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REPAIR KIT
$76.89 -
MOOSE RACING Exhaust Gasket Kit 823148
MOOSE RACING
$21.87A quality exhaust gasket kit is critical to maintaining a sealed exhaust system—preventing exhaust leaks that reduce performance and create noise. MOOSE RACING's 823148 kit ensures proper sealing at...09345330- SKU:
- 09345330
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823149
MOOSE RACING
$21.87A leaking exhaust gasket doesn't just waste horsepower—it compromises engine sealing, invites exhaust leaks, and can lead to costly damage if left unaddressed. The MOOSE RACING Exhaust Gasket Kit...09345331- SKU:
- 09345331
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823049
MOOSE RACING
$8.13A properly sealed exhaust system is critical to engine performance and longevity—leaks rob you of power, introduce unwanted noise, and allow exhaust gases to escape before your turbo or headers can...09345275- SKU:
- 09345275
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$8.13 -
MOOSE RACING Exhaust Gasket Kit 823104
MOOSE RACING
$21.48A failed exhaust gasket compromises both performance and reliability, allowing exhaust gases to escape before they reach your system and creating harmful air leaks. MOOSE RACING's Exhaust Gasket Kit...09345303- SKU:
- 09345303
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823107
MOOSE RACING
$21.87A proper exhaust seal is foundational to engine performance and longevity. Worn or degraded gaskets allow exhaust leaks that compromise power output, increase emissions, and can damage surrounding...09345306- SKU:
- 09345306
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Gasket - Top End - YZ250F 8100025
MOOSE RACING
$78.88A top-end rebuild demands precision-fit gaskets and seals to maintain compression, prevent oil leakage, and ensure reliable performance—especially after a piston replacement. The MOOSE RACING Gasket...09346583- SKU:
- 09346583
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$78.88 -
MOOSE RACING Ignition Cover Gasket 816356
MOOSE RACING
$10.63An aging or damaged ignition cover gasket can compromise engine sealing and lead to oil seepage that undermines reliability. This MOOSE RACING gasket delivers OEM-equivalent durability at a fraction...09346541- SKU:
- 09346541
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63 -
MOOSE RACING Ignition Cover Gasket 816024
MOOSE RACING
$7.97A worn or degraded ignition cover gasket compromises engine sealing and can lead to oil leakage, contamination, and potential ignition system failures. The MOOSE Racing Ignition Cover Gasket 816024...09346919- SKU:
- 09346919
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$7.97 -
MOOSE RACING Head Cover Gasket - KTM 817893
MOOSE RACING
$18.93Valve cover gaskets fail silently until oil starts leaking onto your engine bay. The OEM gasket for your KTM comes with an OEM price tag—but Moose Racing delivers the same reliable sealing...09346971- SKU:
- 09346971
- Availability:
- Ships Same Business Day
- Weight:
- 1.64 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$18.93Qty in Cart: 0Quantity:Price:$18.93Subtotal: -
MOOSE RACING Intake Valve Kit M96-96450
MOOSE RACING
$217.95If you're running high-revving applications or pushing extended engine hours, OEM titanium intake valves will eventually become a reliability bottleneck. The MOOSE RACING Intake Valve Kit M96-96450...09262467- SKU:
- 09262467
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95Qty in Cart: 0Quantity:Price:$217.95Subtotal: -
MOOSE RACING Cylinder - Standard - Honda MSE10010
MOOSE RACING
$390.95A worn or damaged cylinder directly compromises compression, power delivery, and engine reliability—especially in high-demand racing and performance applications. The MOOSE RACING Cylinder restores...09310972- SKU:
- 09310972
- Availability:
- Ships Same Business Day
- Weight:
- 3.11 LBS
- BORE SIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$390.95Qty in Cart: 0Quantity:Price:$390.95Subtotal: -
MOOSE RACING Valve and Spring Kit M30-32450
MOOSE RACING
$115.95If you're running high-mileage on your engine or pushing performance limits, OEM titanium valves won't cut it anymore. The MOOSE RACING Valve and Spring Kit M30-32450 replaces them with stainless...09262933- SKU:
- 09262933
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
$115.95Qty in Cart: 0Quantity:Price:$115.95Subtotal: -
MOOSE RACING Valve Shim Kit - 9.48 mm MSEHCSHIM02
MOOSE RACING
$128.00Proper valve shim selection is critical for maintaining correct valve clearance and preventing costly engine damage. This complete kit eliminates guesswork during valve train maintenance, ensuring...09261828- SKU:
- 09261828
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$128.00 -
MOOSE RACING Valve Shim Kit - 10.00 mm MSEHCSHIM31
MOOSE RACING
$110.00Precision valve train maintenance demands reliable, properly-sized shims that you can trust in critical adjustments. The MOOSE RACING Valve Shim Kit eliminates guesswork with laser-etched sizing and...09261829- SKU:
- 09261829
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- SNOW
$110.00 -
MOOSE RACING Valve Shim - 9.48 x 1.95 - 5 pack MSE5PK948195
MOOSE RACING
$10.95Maintaining proper valve clearance is critical to engine performance and longevity—even a few thousandths of an inch off tolerance can cause valve float, poor sealing, and accelerated wear. These...09261943- SKU:
- 09261943
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$10.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6000
MOOSE RACING
$36.95A leaking slave cylinder compromises brake feel, responsiveness, and safety—whether you're on the track or the street. This MOOSE RACING rebuild kit gives you a complete solution to restore your...09500759- SKU:
- 09500759
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
MOOSE RACING Case Saver Guard - KX250F CSG19
MOOSE RACING
$37.95Engine case damage can sideline your KX250F mid-season, turning a minor crash into an expensive rebuild. The MOOSE RACING Case Saver Guard shields your crankcase from impact without the weight...09500382- SKU:
- 09500382
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- CASE SAVER
- MATERIAL:
- NYLON
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
MOOSE RACING Clutch Cylinder Guard - 350SX 13-100
MOOSE RACING
$42.95A hydraulic clutch cylinder is vulnerable to impact and debris during aggressive riding—especially in competitive environments. This guard protects your MOOSE RACING clutch cylinder from damage that...09500371- SKU:
- 09500371
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal:
