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 Motor Seals - YZ250 822304
MOOSE RACING
$33.45A complete engine seal failure can sideline your YZ250 indefinitely—and OEM replacement kits come with premium pricing that cuts into your race budget. MOOSE Racing Motor Seals deliver genuine OEM-quality fitment and durability at a fraction of the cost,...09350113- SKU:
- 09350113
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
$33.45 -
MOOSE RACING Exhaust Gasket Kit 823171
MOOSE RACING
$6.76A compromised exhaust seal is a silent performance killer—leaking combustion gases not only reduce horsepower but also introduce contaminants into your engine bay and compromise system reliability. The MOOSE RACING Exhaust Gasket Kit 823171 delivers...09346686- SKU:
- 09346686
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$6.76Qty in Cart: 0Quantity:Price:$6.76Subtotal: -
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 reduce efficiency. The MOOSE RACING Exhaust Gasket Kit...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 MOOSE RACING Exhaust Gasket Kit 823170 delivers 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
$6.76 -
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. Worn or deteriorated gaskets allow unmetered air to...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 exhaust gases to escape before they reach your header or...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 performance at a fraction of dealership pricing, giving you the...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
$125.59Qty in Cart: 0Quantity:Price:$125.59Subtotal: -
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 OEM-quality sealing surfaces at a fraction of OEM...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 RACING Valve Seal Kit M30-31540 delivers OEM-equivalent...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
$15.95 -
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 worn seals with precision-engineered components that...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 worn seals with precision-engineered components that...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 rings and cylinders. The MOOSE RACING Valve Seal Kit...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 RACING MSE10006 restores OEM specifications with a durable,...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
$402.95Qty in Cart: 0Quantity:Price:$402.95Subtotal: -
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 performance with precision engineering and a durable...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 your bearings, cam lobes, and valve train, directly...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
$23.95 -
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 rings are precision-engineered to OEM specifications,...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 replacements that restore proper compression, reduce oil...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 comprehensive kit eliminates the tedious sourcing of...09340485- SKU:
- 09340485
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$43.01 -
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 gaskets at a fraction of OEM pricing, so you can...09340486- SKU:
- 09340486
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$31.50Qty in Cart: 0Quantity:Price:$31.50Subtotal: -
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 factory-grade reliability at a fraction of dealership...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
