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 M96-96350
MOOSE RACING
$15.95Valve seals are your engine's first line of defense against oil migration and combustion blow-by—degraded seals lead to oil consumption, hard starting, and eventual ring damage. The MOOSE RACING...09262837- SKU:
- 09262837
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M96-96380
MOOSE RACING
$15.95Valve seal degradation is one of the most insidious sources of oil leakage and blow-by in high-performance engines—issues that directly compromise compression, increase emissions, and rob you of...09262839- SKU:
- 09262839
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- TYPE:
- VALVE STEM
$15.95 -
MOOSE RACING Motor Gasket Kit with Seal - 250SX/XC 811333
MOOSE RACING
$110.53A complete engine and transmission rebuild requires precision-fit gaskets and seals—factory-quality parts at a fraction of OEM pricing. This Moose Racing kit eliminates the frustration of sourcing...09341693- SKU:
- 09341693
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$110.53 -
MOOSE RACING Motor Gasket Kit with Seal - 300XC/XCW 811335
MOOSE RACING
$96.69A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising here guarantees leaks, contamination, and costly downtime. The MOOSE RACING Motor Gasket Kit delivers...09341695- SKU:
- 09341695
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$96.69 -
MOOSE RACING Clutch Cover Gasket 816215
MOOSE RACING
$17.74A leaking clutch cover gasket compromises engine sealing and can lead to oil loss, contamination, and potential engine damage. The MOOSE RACING Clutch Cover Gasket 816215 delivers OEM-equivalent...09341452- SKU:
- 09341452
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$17.74 -
MOOSE RACING Clutch Cover Gasket 816630
MOOSE RACING
$9.97A leaking clutch cover doesn't just waste oil—it compromises engine sealing integrity and creates mess on your garage floor. The MOOSE RACING Clutch Cover Gasket delivers OEM-equivalent sealing...09341455- SKU:
- 09341455
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$9.97 -
MOOSE RACING Ignition Cover Gasket 816673
MOOSE RACING
$5.32A leaking ignition cover gasket compromises engine sealing and can lead to oil weeping that damages surrounding components. The MOOSE RACING Ignition Cover Gasket delivers OEM-level sealing...09341457- SKU:
- 09341457
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.32Qty in Cart: 0Quantity:Price:$5.32Subtotal: -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810364
MOOSE RACING
$86.00A top-end rebuild demands precision—and OEM gasket kits come with OEM pricing. The MOOSE RACING Top End Gasket Kit delivers every seal, O-ring, and gasket you need for a complete engine refresh at a...09344770- SKU:
- 09344770
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$86.00 -
MOOSE RACING Motor Seals - RM125 822124
MOOSE RACING
$30.68Engine seal degradation is one of the most common causes of oil leaks, compression loss, and premature wear—yet many builders waste money on overpriced OEM alternatives. MOOSE RACING Motor Seals...M822124- SKU:
- M822124
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$30.68 -
MOOSE RACING Motor Seals - Yamaha 822228
MOOSE RACING
$40.15Engine and transmission seals are wear items that directly impact oil retention, pressure integrity, and overall drivetrain longevity. OEM replacement seals from Moose Racing give you factory-spec...09340339- SKU:
- 09340339
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$40.15 -
MOOSE RACING Motor Gasket Kit with Seal - 250SX/EXC 811324
MOOSE RACING
$94.32A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or force you back into the shop. MOOSE Racing delivers OEM-equivalent components at...09340476- SKU:
- 09340476
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$94.32 -
MOOSE RACING Complete Motor Gasket Kit - 300SX/EXC 808326
MOOSE RACING
$73.01A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing...09340481- SKU:
- 09340481
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$73.01Qty in Cart: 0Quantity:Price:$73.01Subtotal: -
MOOSE RACING Top End Gasket Kit - KDX/JR50 810416
MOOSE RACING
$18.57A quality gasket kit is essential when rebuilding your KDX or JR50 top end—compromised seals lead to oil leaks, compression loss, and premature engine wear. The MOOSE RACING Top End Gasket Kit...09340483- SKU:
- 09340483
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$18.57 -
MOOSE RACING Complete Motor Gasket Kit - YZ125 808641
MOOSE RACING
$55.47A complete engine rebuild demands precision gaskets and seals that won't fail under race conditions. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork and expense of sourcing...09340492- SKU:
- 09340492
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$55.47 -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811641
MOOSE RACING
$69.07A complete engine and transmission rebuild demands gasket and seal quality you can trust—and OEM pricing that doesn't drain your budget. The MOOSE RACING Motor Gasket Kit delivers genuine OEM-spec...09340493- SKU:
- 09340493
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$69.07 -
MOOSE RACING Complete Motor Gasket Kit without Seals - YZ85 8110026
MOOSE RACING
$98.45A complete engine and transmission rebuild demands gasket and seal integrity—any compromise risks catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent reliability...09346449- SKU:
- 09346449
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$98.45 -
MOOSE RACING Complete Motor Gasket Kit without Seals - KX450 8110027
MOOSE RACING
$221.09A complete engine rebuild demands precision gaskets that match OEM specifications without the premium price tag. This Moose Racing kit delivers comprehensive gasket coverage for both engine and...09346450- SKU:
- 09346450
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
$221.09 -
MOOSE RACING Complete Motor Gasket Kit - KX/RM65 808412
MOOSE RACING
$45.27A complete engine and transmission rebuild demands gasket and seal integrity—any compromise risks catastrophic failure and wasted labor. The MOOSE RACING Complete Motor Gasket Kit delivers...M808412- SKU:
- M808412
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$45.27 -
MOOSE RACING Top End Gasket Kit - CRF450X 810276
MOOSE RACING
$103.88A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity—this Moose Racing kit delivers OEM-quality components at a fraction of factory pricing. Whether...09340968- SKU:
- 09340968
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$103.88 -
MOOSE RACING Valve Shim - 9.48 x 1.65 - 5 pack MSE5PK948165
MOOSE RACING
$9.95Maintaining precise valve clearances is critical for engine performance and longevity—and having quality shims on hand eliminates downtime during valve adjustments. These MOOSE RACING shims are...09261937- SKU:
- 09261937
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.65 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
$9.95
