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
-
MOOSE RACING Exhaust Gasket Kit 823002
MOOSE RACING
$9.68A leaking exhaust system ruins performance and wastes horsepower before it ever leaves your engine. OEM gaskets deteriorate under heat cycles, causing exhaust leaks that compromise seal integrity and...09345272- SKU:
- 09345272
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$9.68 -
MOOSE RACING Exhaust Gasket Kit 823170
MOOSE RACING
$6.76A quality exhaust gasket kit is essential for maintaining a reliable seal between your exhaust manifold and cylinder head—preventing exhaust leaks that rob horsepower and create unwanted noise. The...09345350- SKU:
- 09345350
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- EXHAUST
- UNITS:
- KIT
$6.76Qty in Cart: 0Quantity:Price:$6.76Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823176
MOOSE RACING
$21.48A quality exhaust gasket kit is essential for maintaining a proper seal between exhaust manifold and header joints, preventing costly exhaust leaks that compromise performance and increase emissions...09345351- SKU:
- 09345351
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823187
MOOSE RACING
$34.85Exhaust gasket degradation is one of the most common sources of power loss and unwanted emissions in high-performance engines. A failed or deteriorating gasket compromises seal integrity, allowing...09345352- SKU:
- 09345352
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$34.85 -
MOOSE RACING Complete Gasket Kit 808374
MOOSE RACING
$125.59A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't fail under sustained load. The MOOSE RACING Complete Gasket Kit 808374 delivers OEM-equivalent...09345357- SKU:
- 09345357
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$125.59 -
MOOSE RACING Complete Motor Gasket Kit - KX450F 808485
MOOSE RACING
$175.37A complete engine and transmission rebuild demands precision-fitted gaskets and seals that won't compromise your work or your engine's longevity. The MOOSE RACING Complete Motor Gasket Kit delivers...09345358- SKU:
- 09345358
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$175.37 -
MOOSE RACING Valve Seal Kit M30-31540
MOOSE RACING
$15.95Valve seal degradation is a common cause of oil consumption and compression loss, particularly in high-performance and turbocharged applications where thermal stress accelerates wear. The MOOSE...09262819- SKU:
- 09262819
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M40-40160
MOOSE RACING
$15.95Factory valve seals degrade under sustained high heat and aggressive driving, leading to oil consumption, blow-by, and reduced ring seal integrity. The MOOSE RACING M40-40160 Valve Seal Kit replaces...09262822- SKU:
- 09262822
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 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 Valve Seal Kit M40-40370
MOOSE RACING
$15.95Valve seal degradation leads to oil consumption, compression loss, and increased emissions—issues that compound under sustained high RPM operation. The MOOSE RACING Valve Seal Kit M40-40370 replaces...09262823- SKU:
- 09262823
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M40-40790
MOOSE RACING
$15.95Valve seal degradation is a silent killer of engine performance and longevity—worn seals allow oil to seep into combustion chambers, causing blow-by, reduced compression, and accelerated wear on...09262824- SKU:
- 09262824
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
MOOSE RACING Cylinder - Standard MSE10006
MOOSE RACING
$402.95A worn or damaged cylinder directly impacts compression, heat management, and overall engine reliability—making replacement essential for consistent performance on the track or trail. The MOOSE...09310446- SKU:
- 09310446
- Availability:
- Ships Same Business Day
- Weight:
- 3.23 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
$402.95 -
MOOSE RACING Cylinder - Standard MSE20001
MOOSE RACING
$380.95A worn or damaged cylinder compromises compression, power delivery, and engine reliability—especially under racing conditions where tolerances matter. The MOOSE RACING Cylinder MSE20001 restores OEM...09310450- SKU:
- 09310450
- Availability:
- Ships Same Business Day
- Weight:
- 3.44 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$380.95 -
MOOSE RACING Magnetic Drain Plug DP129
MOOSE RACING
$23.95Engine wear begins the moment oil circulates—and ferrous particles are the silent assassins. The MOOSE RACING Magnetic Drain Plug DP129 captures these metal filings before they recirculate through...09200065- SKU:
- 09200065
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- COLOR/FINISH:
- RED
- DIAMETER - THREAD SIZE METRIC:
- M8 X 1.25 X 20 MM
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- MATERIAL:
- 7075 ALUMINUM
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
MOOSE RACING Piston Ring - For 57.95 mm Piston MSE53010005800
MOOSE RACING
$3.95A worn or damaged piston ring directly impacts compression, power delivery, and fuel efficiency—making a quality replacement essential for maintaining peak engine performance. MOOSE Racing piston...09120844- SKU:
- 09120844
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- PISTON SIZE METRIC:
- STANDARD
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
MOOSE RACING Piston Ring - For 57.95 mm Piston MSE55910005800
MOOSE RACING
$38.80A worn or damaged piston ring compromises combustion efficiency, increases blow-by, and forces your engine to work harder while losing power. MOOSE Racing piston rings are precision-engineered...09120845- SKU:
- 09120845
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
$38.80 -
MOOSE RACING Motor Gasket Kit with Seal - KDX/JR 811416
MOOSE RACING
$43.01A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—Moose Racing delivers OEM-quality components at a fraction of dealer pricing. This...09340485- SKU:
- 09340485
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$43.01Qty in Cart: 0Quantity:Price:$43.01Subtotal: -
MOOSE RACING Top End Gasket Kit - RM125 810550
MOOSE RACING
$31.50When you're rebuilding an RM125 top end, every gasket and seal matters—a single leak or failure can compromise your entire engine. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and...09340486- SKU:
- 09340486
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$31.50 -
MOOSE RACING Complete Motor Gasket Kit - RM125 808550
MOOSE RACING
$83.24A complete engine and transmission rebuild demands gaskets and seals that won't fail under load—and OEM replacements can devastate your budget. The MOOSE RACING Complete Motor Gasket Kit gives you...09340487- SKU:
- 09340487
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$83.24 -
MOOSE RACING Motor Gasket Kit with Seal - RM125 811550
MOOSE RACING
$102.70A complete engine and transmission rebuild demands precision gaskets and seals that match OEM specifications—without the OEM price tag. This MOOSE RACING Motor Gasket Kit delivers genuine replacement...09340488- SKU:
- 09340488
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$102.70 -
MOOSE RACING Complete Motor Gasket Kit - TTR125 808640
MOOSE RACING
$73.01A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality replacement seals and...09340489- SKU:
- 09340489
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$73.01
