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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Cylinder - Standard - KX450F MSE30011
MOOSE RACING
$402.95Replace your damaged or worn OEM cylinder, Made from cast aluminum; nickel silicon carbide plated, Precision-machined and honed to OEM stock bore sizes, Extremely durable low-friction bore surface allows for greater heat dissipation, Stock OEM...09310625- SKU:
- 09310625
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- CAST
$402.95 -
MOOSE RACING Circlip MSE72071K
MOOSE RACING
$3.95Made in the U.S.A.09130190- SKU:
- 09130190
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- SET
$3.95 -
MOOSE RACING Circlip MSE72074K
MOOSE RACING
$3.95Made in the U.S.A.09130192- SKU:
- 09130192
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- CIRCLIP
- UNITS:
- SET
- APPLICATION:
- PISTON
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
$3.95 -
MOOSE RACING Intake Valve Kit M80-80850
MOOSE RACING
$307.95Stainless steel conversion kits include only what’s needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts, Valves...09262457- SKU:
- 09262457
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
$307.95 -
MOOSE RACING Valve and Spring Kit M80-80960
MOOSE RACING
$217.95Stainless steel conversion kits include only what’s needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts, Valves...09262460- SKU:
- 09262460
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- KIT
$217.95 -
MOOSE RACING Clutch Cover Gasket 816143
MOOSE RACING
$15.23Moose can now handle all your gasket and seal needs at a fraction of OEM cast, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmissions with total confidence as each set is designed for durability and...09341449- SKU:
- 09341449
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$15.23 -
MOOSE RACING Ignition Cover Gasket 816144
MOOSE RACING
$8.80Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, These...09341450- SKU:
- 09341450
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$8.80 -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4005
MOOSE RACING
$24.95Kits include hardened steel bushing, an upgraded seal, an O-ring (where applicable) and a snap ring or lock washer (where applicable), Made in the U.S.A.09350432- SKU:
- 09350432
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$24.95 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810959
MOOSE RACING
$71.55Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09344771- SKU:
- 09344771
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$71.55 -
MOOSE RACING Top End Gasket Kit - Kawasaki 810483
MOOSE RACING
$30.62Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09344772- SKU:
- 09344772
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$30.62 -
MOOSE RACING Top End Gasket Kit - Kawasaki 810484
MOOSE RACING
$30.06Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09344773- SKU:
- 09344773
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$30.06 -
MOOSE RACING Top End Gasket Kit - Yamaha 810642
MOOSE RACING
$54.04Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09344774- SKU:
- 09344774
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$54.04 -
MOOSE RACING Top End Gasket - CRF250 810262
MOOSE RACING
$76.95Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340071- SKU:
- 09340071
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$76.95 -
MOOSE RACING Motor Seals - YZ/WR 250 822117
MOOSE RACING
$36.40Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M822117- SKU:
- M822117
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- UNITS:
- SET
- TYPE:
- OIL
$36.40 -
MOOSE RACING Top End Gasket - PW50 810601
MOOSE RACING
$13.39Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340078- SKU:
- 09340078
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$13.39 -
MOOSE RACING Top End Gasket - PW80 810615
MOOSE RACING
$26.26Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340079- SKU:
- 09340079
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$26.26 -
MOOSE RACING Top End Gasket - TTR125 810640
MOOSE RACING
$39.34Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340080- SKU:
- 09340080
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$39.34 -
VESRAH Exhaust Valve GG-2007-EX
VESRAH
$32.83Vesrah valves are precision manufactured from top-quality materials to match OEM valvesGG2007EX- SKU:
- GG2007EX
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- HEAD DIAMETER METRIC:
- 39.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- LENGTH METRIC:
- 101.20 MM
- RIDING STYLE:
- STREET
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- HEAD DIAMETER:
- 39,00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 8.00 MM
$32.83 -
VESRAH Exhaust Valve GG-2013-EX
VESRAH
$25.17Vesrah valves are precision manufactured from top-quality materials to match OEM valvesGG2013EX- SKU:
- GG2013EX
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- HEAD DIAMETER:
- 28,50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- LENGTH METRIC:
- 92.50 MM
- RIDING STYLE:
- STREET
- STEM DIAMETER METRIC:
- 6.00 MM
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 28.50 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$25.17 -
VESRAH Exhaust Valve GG-3014-EX
VESRAH
$26.50Vesrah valves are precision manufactured from top-quality materials to match OEM valvesGG3014EX- SKU:
- GG3014EX
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 89.30 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 26.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- HEAD DIAMETER:
- 26,00 MM
- STEM DIAMETER METRIC:
- 5.50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$26.50
