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 Circlip MSE72074K
MOOSE RACING
$3.95Circlips are critical retention components in high-performance engines and transmissions—a failed or worn circlip can lead to catastrophic internal damage. The MOOSE Racing MSE72074K delivers precise...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
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
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...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...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...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...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...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...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...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...09344773- SKU:
- 09344773
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$30.06Qty in Cart: 0Quantity:Price:$30.06Subtotal: -
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...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...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...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...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...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...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 -
On Sale
VESRAH Exhaust Valve GG-2007-EX
VESRAH
MSRP: $32.83Now: $31.19Was: $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...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
MSRP: $32.83Now: $31.19Was: $32.83 -
On Sale
VESRAH Exhaust Valve GG-2013-EX
VESRAH
MSRP: $25.17Now: $23.91Was: $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...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
MSRP: $25.17Now: $23.91Was: $25.17 -
On Sale
VESRAH Exhaust Valve GG-3014-EX
VESRAH
MSRP: $26.50Now: $25.18Was: $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...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
MSRP: $26.50Now: $25.18Was: $26.50 -
On Sale
VESRAH Intake Valve GG-3014-IN
VESRAH
MSRP: $17.00Now: $16.15Was: $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...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
MSRP: $17.00Now: $16.15Was: $17.00 -
On Sale
VESRAH Exhaust Valve GG-4011-EX
VESRAH
MSRP: $28.17Now: $26.76Was: $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...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
MSRP: $28.17Now: $26.76Was: $28.17
