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
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On Sale
ATHENA Top End Gasket Kit - Beta P400060600014
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95Whether you're prepping for race day or executing a midseason engine refresh, compression ratio optimization is critical to extracting maximum power from your engine. This kit gives you the flexibility to run either standard fuel with stock compression...09347506- SKU:
- 09347506
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $58.95Now: $53.00Was: $58.95Qty in Cart: 0Quantity:Price:MSRP: $58.95Now: $53.00Was: $58.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600071
ATHENA
MSRP: $87.95Now: $79.00Was: $87.95Whether you're prepping for race day or performing a mid-season engine refresh, a properly sealed top end is non-negotiable for peak performance and reliability. This kit gives you the flexibility to optimize your compression ratio based on fuel type—run...09347507- SKU:
- 09347507
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
MSRP: $87.95Now: $79.00Was: $87.95 -
On Sale
ATHENA Complete Gasket Kit - Beta P400060900014
ATHENA
MSRP: $176.95Now: $159.00Was: $176.95A complete engine rebuild demands gaskets that maintain a reliable seal under sustained high heat and pressure—this kit delivers exactly that. The ATHENA Complete Gasket Kit combines proven materials with intelligent engineering to eliminate compression...09347509- SKU:
- 09347509
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
MSRP: $176.95Now: $159.00Was: $176.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900071
ATHENA
MSRP: $227.95Now: $205.00Was: $227.95A compromised gasket kit leaves your engine vulnerable to coolant leaks, oil seepage, and combustion chamber failures that can quickly escalate into catastrophic damage. The ATHENA Complete Gasket Kit delivers the comprehensive seal integrity your...09347510- SKU:
- 09347510
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
MSRP: $227.95Now: $205.00Was: $227.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510900099
ATHENA
MSRP: $218.95Now: $197.00Was: $218.95A complete engine rebuild demands gaskets that can handle thermal cycling and high combustion pressures without failure. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across all critical engine surfaces, eliminating the risk...09347511- SKU:
- 09347511
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
MSRP: $218.95Now: $197.00Was: $218.95 -
On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475017
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95A failing water pump gasket compromises your cooling system's integrity, risking catastrophic overheating and engine damage. This ATHENA gasket kit supplies all the OEM-spec seals and components needed to restore your Kawasaki's water circulation system...09347512- SKU:
- 09347512
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
MSRP: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Water Pump Gasket Kit - Gas Gas/Husqvarna/KTM P400270475022
ATHENA
MSRP: $61.95Now: $56.00Was: $61.95A failing water pump gasket can compromise your engine's cooling system and lead to costly downtime. This ATHENA gasket kit provides OEM-quality sealing surfaces specifically engineered for Gas Gas, Husqvarna, and KTM platforms, ensuring reliable thermal...09347513- SKU:
- 09347513
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
MSRP: $61.95Now: $56.00Was: $61.95 -
MOOSE RACING Piston Kit - 38.95 mm - Cobra 50 MSE24105B
MOOSE RACING
$63.95A quality piston kit is fundamental to reliable engine performance, especially in high-RPM applications where thermal stress and wear demand precision-engineered components. The MOOSE Racing Piston Kit for Cobra 50 delivers gravity-cast construction with...09106546- SKU:
- 09106546
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$63.95 -
MOOSE RACING Complete Gasket Set - Honda 8080039MSE
MOOSE RACING
$142.52A complete engine and transmission rebuild demands gasket integrity you can trust—factory tolerances met without the OEM price tag. MOOSE Racing gasket sets are engineered with high-tech materials and precise fitment, eliminating the risk of leaks or...09347463- SKU:
- 09347463
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$142.52 -
MOOSE RACING Complete Gasket Set - Honda 8080046MSE
MOOSE RACING
$194.66A complete engine and transmission rebuild demands precision-fit gaskets that won't fail under load. The MOOSE Racing Complete Gasket Set eliminates the guesswork of sourcing individual components while delivering OEM-quality reliability at a fraction of...09347464- SKU:
- 09347464
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$194.66 -
MOOSE RACING Inner Clutch Gasket 816829MSE
MOOSE RACING
$19.21A compromised inner clutch gasket leads to oil seepage, clutch slip, and potential drivetrain damage—making this seal critical to reliable operation. MOOSE Racing's U.S.-manufactured gasket delivers the precision fit and material durability required to...09347466- SKU:
- 09347466
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$19.21 -
MOOSE RACING Ignition Cover Gasket - Kawasaki 816830MSE
MOOSE RACING
$9.97A worn or damaged ignition cover gasket compromises engine sealing and can lead to oil leakage, contamination, and performance degradation. This OEM-spec MOOSE Racing gasket restores a reliable seal when replacing your clutch or addressing ignition cover...09347467- SKU:
- 09347467
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$9.97 -
MOOSE RACING Inner Clutch Gasket 816840MSE
MOOSE RACING
$72.11A worn or degraded inner clutch gasket compromises both sealing integrity and clutch engagement reliability—leading to oil seepage and potential drivetrain issues. The MOOSE RACING Inner Clutch Gasket delivers OEM-quality sealing performance and is...09347468- SKU:
- 09347468
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$72.11 -
MOOSE RACING Oil Seal Set - Honda 822395MSE
MOOSE RACING
$11.52A compromised oil seal or gasket doesn't just leak—it costs you horsepower, reliability, and engine longevity. This comprehensive Moose Racing Oil Seal Set delivers everything you need for a complete engine and transmission rebuild in one box,...09351263- SKU:
- 09351263
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$11.52 -
MOOSE RACING Oil Seal Set - Kawasaki 822403MSE
MOOSE RACING
$55.32A complete engine and transmission rebuild demands precision sealing to prevent oil leakage, contamination, and premature wear. This MOOSE RACING Oil Seal Set eliminates the guesswork of sourcing individual seals and gaskets across multiple suppliers,...09351264- SKU:
- 09351264
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$55.32 -
MOOSE RACING Cam Chain - 92RH2015 x 104 Links MSEHC92RH2015104
MOOSE RACING
$74.95A worn or damaged cam chain compromises valve timing precision, leading to power loss, rough idle, and potential engine damage. The MOOSE RACING cam chain delivers OEM-equivalent reliability with precision engineering, ensuring consistent valve actuation...09251492- SKU:
- 09251492
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$74.95 -
MOOSE RACING Cam Chain - 92RH2015 x 112 Links MSEHC92RH2015112
MOOSE RACING
$53.95A cam chain in peak condition is critical to reliable engine operation and consistent valve timing—even minor wear can lead to timing drift and performance loss. The MOOSE RACING 92RH2015 x 112 Links cam chain delivers OEM-grade durability with...09251493- SKU:
- 09251493
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$53.95 -
MOOSE RACING Cam Chain - 98XRH2010 x 126 Links MSEHC98XRH2010126
MOOSE RACING
$50.95A worn or compromised cam chain directly impacts valve timing accuracy and engine reliability—critical factors whether you're running a precision build or maintaining consistent track performance. The MOOSE RACING Cam Chain delivers OEM-standard...09251494- SKU:
- 09251494
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$50.95 -
MOOSE RACING Cam Chain - 82RH2010 x 108 Links MSEHC82RH2010108
MOOSE RACING
$69.95A worn or damaged cam chain compromises valve timing precision, leading to performance loss and potential engine damage. The MOOSE RACING 82RH2010 delivers OEM-grade reliability with superior durability through shot-peened construction and precision...09251495- SKU:
- 09251495
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$69.95 -
MOOSE RACING Cam Chain - DID25SH x 104 Links MSEHCDID25SH104
MOOSE RACING
$53.95A cam chain is critical to your engine's valve timing precision—any slack or wear directly compromises performance, fuel efficiency, and reliability. The MOOSE RACING DID25SH cam chain is engineered with select steel alloys and precision bushings to...09251496- SKU:
- 09251496
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$53.95
