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 Gasket Clutch Inner delivers OEM-equivalent sealing with...09346932- SKU:
- 09346932
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH INNER
- UNITS:
- EACH
$11.64Qty in Cart: 0Quantity:Price:$11.64Subtotal: -
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. The MOOSE RACING Ignition Cover Gasket delivers...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 delivers OEM-equivalent sealing performance with the...09346935- SKU:
- 09346935
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
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 OEM-quality sealing at a fraction of dealership...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 Gasket Kit delivers OEM-equivalent performance at a fraction...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 eliminates guesswork by providing every gasket and...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 fraction of dealership pricing, making it an economical choice...09342213- SKU:
- 09342213
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63 -
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 high-tech materials engineered for the demands of both...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 of dealership pricing, giving you the confidence to...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 factory pricing, so you can confidently refresh your KTM...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 RACING Motor Gasket Kit eliminates that risk by supplying...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 precision-engineered components that deliver superior sealing...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
$15.95 -
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 those components with stainless steel Black Diamond...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 valves engineered to deliver up to 4x longer service life...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 maintenance—each shim is laser-etched with its size for...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
$9.95 -
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 Kit M30-31410 replaces worn OEM seals with...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
$15.95 -
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 reduced engine efficiency. The MOOSE RACING Valve Seal Kit...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 seals with precision-engineered components that...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
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 2.08 - 5 pack MSE5PK890208
MOOSE RACING
$10.95Maintaining 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 shims deliver the durability and accuracy that...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
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
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 component with CNC-machined aluminum construction, while...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
