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 Intake Valve Kit M80-80850
MOOSE RACING
$307.95Factory titanium intake valves wear rapidly under sustained high-RPM operation, compromising flow efficiency and forcing expensive head rebuilds. The MOOSE RACING M80-80850 stainless steel conversion kit replaces worn or damaged valves with Black Diamond...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
$217.95If you're running high-mileage or high-stress applications, OEM titanium valves can become a limiting factor in both longevity and flow characteristics. The MOOSE RACING Valve and Spring Kit M80-80960 replaces those components with stainless steel Black...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
$15.23A leaking clutch cover gasket compromises both engine performance and reliability—oil seepage leads to contamination, wear, and potential catastrophic failure. The MOOSE RACING Clutch Cover Gasket 816143 delivers a precision-engineered OEM replacement...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
$8.80Ignition cover gaskets fail silently—until oil starts seeping onto your engine bay and performance suffers. The MOOSE RACING 816144 eliminates guesswork with OEM-spec sealing geometry at a fraction of dealership pricing. Whether you're rebuilding after a...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
$24.95A worn countershaft sprocket seal compromises engine integrity and accelerates component wear—replacing it with OEM-quality parts is essential preventive maintenance. This MOOSE RACING kit delivers everything needed for a complete seal assembly,...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
$71.55A top-end rebuild demands precision—incorrect gasket fitment or inferior seal materials will compromise compression, leak oil, and waste your time and money. The MOOSE RACING Top End Gasket Kit eliminates guesswork by including every OEM-spec gasket,...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
$30.62A top-end rebuild demands precision components that won't compromise reliability or performance. The MOOSE RACING Gasket Kit delivers OEM-quality seals and gaskets at a fraction of the cost, letting you rebuild with confidence whether you're replacing a...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
$30.06When you're rebuilding a top end, cutting corners on gaskets and seals is a guaranteed path to failure. The MOOSE RACING Top End Gasket Kit gives you everything needed for a complete, reliable rebuild at a fraction of OEM pricing—without sacrificing the...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
$54.04A quality top-end rebuild requires precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance at a fraction of the price, with every component...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
$76.95A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING gasket set gives you OEM-equivalent seals at a fraction of the price, letting you rebuild your CRF250 with...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
$36.40Engine seals are critical wear items that fail silently—until oil starts leaking past your crankshaft or transmission begins weeping fluid onto your garage floor. The MOOSE RACING Motor Seals kit eliminates the guesswork by providing a complete...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
$36.40Qty in Cart: 0Quantity:Price:$36.40Subtotal: -
MOOSE RACING Top End Gasket - PW50 810601
MOOSE RACING
$13.39A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. MOOSE RACING delivers OEM-equivalent performance at a fraction of the cost, with every gasket, O-ring, and seal you need for a complete,...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
$26.26A top-end rebuild demands precision gaskets and seals that won't fail under race conditions or repeated heat cycles. The MOOSE RACING Top End Gasket Set delivers OEM-equivalent reliability at a fraction of the cost, giving you the confidence to push your...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
$39.34When you're rebuilding a TTR125 top end, OEM gasket kits carry a premium price tag—and compromise on quality isn't an option. The MOOSE RACING Top End Gasket Set gives you OEM-spec reliability at a fraction of the cost, with high-tech materials...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
$32.83A worn or damaged exhaust valve directly compromises engine efficiency, combustion timing, and overall performance. The VESRAH GG-2007-EX is precision-engineered to restore OEM-level sealing and durability, ensuring your engine breathes properly and...GG2007EX- 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
$25.17Exhaust valves are critical components that directly impact combustion efficiency, thermal management, and overall engine reliability. The VESRAH GG-2013-EX is precision-manufactured to match OEM specifications, ensuring consistent sealing and durability...GG2013EX- 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
$26.50Exhaust valves are critical to engine reliability and performance—worn or damaged valves compromise combustion efficiency, increase emissions, and can lead to catastrophic engine failure. The VESRAH Exhaust Valve GG-3014-EX is precision-manufactured to...GG3014EX- 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
$26.50Qty in Cart: 0Quantity:Price:$26.50Subtotal: -
VESRAH Intake Valve GG-3014-IN
VESRAH
$17.00Your engine's intake valves are critical to combustion efficiency and overall performance—worn or damaged valves directly compromise horsepower and fuel economy. The VESRAH Intake Valve GG-3014-IN delivers OEM-equivalent precision and durability without...GG3014IN- SKU:
- GG3014IN
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STEM DIAMETER METRIC:
- 5.50 MM
- APPLICATION:
- INTAKE
- HEAD DIAMETER:
- 30,00 MM
- HEAD DIAMETER METRIC:
- 30.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- LENGTH METRIC:
- 90.30 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$17.00 -
VESRAH Exhaust Valve GG-4011-EX
VESRAH
$28.17A worn or damaged exhaust valve directly compromises engine efficiency, throttle response, and fuel economy—making replacement essential for maintaining peak performance. The VESRAH GG-4011-EX is precision-engineered to OEM specifications, ensuring...GG4011EX- SKU:
- GG4011EX
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- HEAD DIAMETER:
- 31,00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- LENGTH METRIC:
- 99.00 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 7.00 MM
- HEAD DIAMETER METRIC:
- 31.00 MM
$28.17 -
VESRAH Exhaust Valve GG-1040-EX
VESRAH
$42.67A worn or damaged exhaust valve can compromise combustion efficiency, increase emissions, and reduce engine responsiveness. The VESRAH Exhaust Valve GG-1040-EX delivers OEM-equivalent performance at a fraction of replacement costs, restoring your...09262807- SKU:
- 09262807
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- LENGTH METRIC:
- 96.00 MM
- HEAD DIAMETER METRIC:
- 23.50 MM
- HEAD DIAMETER:
- 23,50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 2 PIECE
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 5.50 MM
$42.67Qty in Cart: 0Quantity:Price:$42.67Subtotal:
