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 Water Pump Rebuild Kit 821212
MOOSE RACING
$56.29A failing water pump can compromise your entire cooling system, leading to catastrophic engine damage if left unaddressed. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap ring needed to restore your water pump to OEM...09345178- SKU:
- 09345178
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$56.29 -
MOOSE RACING Valve Seal Kit M96-96320
MOOSE RACING
$15.95Valve seals are critical to maintaining compression and preventing oil burn-off in high-performance engines. Over time, OEM seals degrade from heat cycling and combustion pressures, leading to blow-by, increased emissions, and power loss. The MOOSE...09262836- SKU:
- 09262836
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
$15.95 -
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 M96-96350 replaces worn seals with precision-engineered...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 power output. The MOOSE RACING M96-96380 Valve Seal Kit...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
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
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 individual components by bundling everything you need in...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 OEM-quality seals at a fraction of OEM pricing, giving...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 sealing performance at a fraction of OEM costs, using...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 performance at a fraction of the cost, using high-tech...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 performance at a fraction of dealership pricing, making it the...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 fraction of the cost, using high-tech materials...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 deliver genuine replacement quality at a fraction of the...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 fit and durability without the dealership markup. This...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 a fraction of dealership pricing, letting you rebuild...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 individual components while delivering OEM-quality...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
$73.01 -
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 delivers OEM-equivalent reliability at a fraction of the...09340483- SKU:
- 09340483
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$18.57Qty in Cart: 0Quantity:Price:$18.57Subtotal: -
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 individual components—everything you need for YZ125 engine...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 seals paired with US-manufactured gaskets, so you can...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 at a fraction of the cost, using high-tech materials...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 transmission, allowing you to refresh sealing surfaces with...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 OEM-quality replacement seals and gaskets at a fraction of...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
