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 Gasket Clutch Inner - Yamaha 816150
MOOSE RACING
$11.64A failing clutch gasket can compromise your entire drivetrain's integrity, leading to fluid leaks, loss of pressure, and catastrophic clutch failure at the worst possible moment. The MOOSE RACING...09346932- SKU:
- 09346932
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
- UNITS:
- EACH
$11.64 -
MOOSE RACING Ignition Cover Gasket 816151
MOOSE RACING
$7.28A worn or damaged ignition cover gasket compromises engine sealing, risking oil leakage and potential internal contamination—exactly what you can't afford during competition or high-mileage operation...09346933- SKU:
- 09346933
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$7.28 -
MOOSE RACING Ignition Cover Gasket 816178
MOOSE RACING
$10.95A properly sealed ignition cover is critical to maintaining engine reliability and preventing oil seepage that can compromise electrical components. The MOOSE RACING Ignition Cover Gasket 816178...09346935- SKU:
- 09346935
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$10.95 -
MOOSE RACING Motor Gasket Kit with Seal - 350SXF 811339
MOOSE RACING
$165.87A complete engine and transmission rebuild demands precision-fit gaskets and seals—any compromise here leads to leaks, performance loss, and costly rework. The MOOSE RACING Motor Gasket Kit delivers...09342210- SKU:
- 09342210
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$165.87 -
MOOSE RACING Motor Gasket Kit with Seal - RMZ250 811567
MOOSE RACING
$175.51A complete engine and transmission rebuild requires precision-fit gaskets and seals—compromising on quality means risking oil leaks, compression loss, and premature wear. The MOOSE RACING Motor...09342211- SKU:
- 09342211
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
$175.51 -
MOOSE RACING Motor Gasket Kit with Seal - YZ450F 811689
MOOSE RACING
$194.87A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising on quality here risks leaks, contamination, and catastrophic failure. The MOOSE RACING Motor Gasket Kit...09342212- SKU:
- 09342212
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$194.87 -
MOOSE RACING Ignition Cover Gasket 816705
MOOSE RACING
$10.63A leaking ignition cover gasket compromises engine sealing and can lead to oil seepage that damages adjacent components. This MOOSE RACING replacement gasket delivers OEM-quality sealing at a...09342213- SKU:
- 09342213
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63Qty in Cart: 0Quantity:Price:$10.63Subtotal: -
MOOSE RACING Clutch Cover Gasket 817942
MOOSE RACING
$8.21A leaking clutch cover gasket compromises engine integrity and invites costly oil seepage into your ignition system. The MOOSE RACING Clutch Cover Gasket 817942 delivers OEM-equivalent sealing with...09342214- SKU:
- 09342214
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$8.21Qty in Cart: 0Quantity:Price:$8.21Subtotal: -
MOOSE RACING Complete Gasket Kit 808337
MOOSE RACING
$63.10A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. The MOOSE RACING Complete Gasket Kit delivers OEM-quality components at a fraction...09341954- SKU:
- 09341954
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$63.10 -
MOOSE RACING Top End Gasket Kit - KTM105 SX/XC 810332
MOOSE RACING
$44.42A top-end rebuild demands precision seals and gaskets that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit gives you OEM-quality components at a fraction of...09341955- SKU:
- 09341955
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$44.42 -
MOOSE RACING Motor Gasket Kit with Seal - KTM 105SX 811332
MOOSE RACING
$126.65A complete engine and transmission rebuild requires precision-fit gaskets and seals—any compromise on fit or material quality risks oil leaks, contamination, and catastrophic failure. The MOOSE...09341957- SKU:
- 09341957
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$126.65Qty in Cart: 0Quantity:Price:$126.65Subtotal: -
MOOSE RACING Valve Seal Kit M96-96470
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of oil consumption and compression loss in high-mileage engines. The MOOSE RACING Valve Seal Kit M96-96470 replaces worn OEM seals with...09262840- SKU:
- 09262840
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Intake Valve Kit M30-31210
MOOSE RACING
$196.95OEM titanium intake valves face accelerated wear under high-stress racing conditions, limiting your engine's reliability and rebuild intervals. The MOOSE RACING Intake Valve Kit M30-31210 replaces...09262428- SKU:
- 09262428
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$196.95 -
MOOSE RACING Intake Valve Kit M30-31240
MOOSE RACING
$196.95If you're running OEM titanium intake valves, you're leaving performance and longevity on the table. The MOOSE RACING M30-31240 Intake Valve Kit replaces them with Black Diamond stainless steel...09262430- SKU:
- 09262430
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- KIT
$196.95Qty in Cart: 0Quantity:Price:$196.95Subtotal: -
MOOSE RACING Valve Shim - 9.48 x 3.50 - 5 pack MSE5PK948350
MOOSE RACING
$9.95Precision valve shimming is critical for maintaining tight valve clearances and preventing costly engine damage. This 5-pack of MOOSE RACING valve shims eliminates the guesswork during valve train...09261974- SKU:
- 09261974
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.50 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Seal Kit M30-31410
MOOSE RACING
$15.95Valve seal degradation causes oil consumption, compression loss, and increased emissions—issues that compound quickly under racing or high-performance driving conditions. The MOOSE RACING Valve Seal...09262817- SKU:
- 09262817
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M30-31570
MOOSE RACING
$15.95Valve seals are a critical wear item that directly impacts combustion chamber integrity and oil consumption. Factory seals often degrade under sustained high RPM operation, leading to blow-by and...09262820- SKU:
- 09262820
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
$15.95 -
MOOSE RACING Valve Seal Kit M60-60340
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of oil leakage, compression loss, and increased blowby in high-performance engines. The MOOSE RACING Valve Seal Kit M60-60340 replaces worn OEM...09262825- SKU:
- 09262825
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- UNITS:
- KIT
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
$15.95 -
MOOSE RACING Valve Shim - 8.90 x 2.08 - 5 pack MSE5PK890208
MOOSE RACING
$11.95Maintaining precise valve clearances is non-negotiable for engine longevity and performance—and having a complete shim kit on hand eliminates guesswork during valve adjustments. These forged 4140...09261914- SKU:
- 09261914
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.08 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$11.95 -
MOOSE RACING Clutch Cylinder Guard - 400-525 13-092
MOOSE RACING
$27.95Hydraulic clutch cylinders are vulnerable to chain slap and impact damage on aggressive riding—unplanned downtime derails race day. The MOOSE RACING Clutch Cylinder Guard protects this critical...09500150- SKU:
- 09500150
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- SLAVE CYLINDER
$27.95
