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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On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475002
ATHENA
MSRP: $40.95Now: $37.00Was: $40.95A failing water pump gasket kit compromises your cooling system's integrity, leading to coolant leaks, overheating, and potential engine damage. The ATHENA Water Pump Gasket Kit restores a complete seal across critical pump and clutch cover interfaces,...09346050- SKU:
- 09346050
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $40.95Now: $37.00Was: $40.95 -
On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475001
ATHENA
MSRP: $40.95Now: $37.00Was: $40.95Water pump gasket failure is one of the most common causes of coolant leaks in Kawasaki engines, often going unnoticed until serious overheating occurs. This OEM gasket kit from ATHENA gives you all the sealing components needed for a complete water pump...09346049- SKU:
- 09346049
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $40.95Now: $37.00Was: $40.95 -
HELIX Gasket Material - 14.5" x 30" 403-5012
HELIX
$34.95A quality gasket material is foundational to any reliable engine or powersports build—it's the seal between catastrophic leaks and a tight, performing system. The HELIX 403-5012 delivers consistent, durable sealing across oil, fuel, coolant, and exhaust...09344769- SKU:
- 09344769
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- NITRILE RUBBER
- RIDING STYLE:
- ATV
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- THICKNESS:
- 0,81 MM (0,032')
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- BULK
$34.95 -
COMETIC Stator Gasket - Kawasaki EC904032AFM
COMETIC
$17.95Stator cover gasket failures lead to oil leaks, increased service downtime, and potential engine damage—especially in high-performance applications where sealing surfaces are compromised. The COMETIC Stator Gasket eliminates the frustration of stuck...09344504- SKU:
- 09344504
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- STATOR COVER
- UNITS:
- EACH
$17.95 -
COMETIC Clutch Gasket - Honda EC901032AFM
COMETIC
$18.95A quality clutch gasket is essential to prevent oil weeping and maintain a reliable seal under the thermal stress of racing and high-performance driving. The COMETIC Clutch Gasket eliminates the need for messy sealants and time-consuming re-torquing,...09344503- SKU:
- 09344503
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
- PRODUCT NAME:
- GASKET
$18.95 -
COMETIC Clutch Gasket - Honda EC619032AFM
COMETIC
$15.95Clutch cover gasket failures lead to oil weeping, loss of torque retention, and costly downtime between rebuilds. The COMETIC EC619032AFM eliminates these headaches with an aluminum-core AFM material engineered to seal reliably under sustained heat and...09344482- SKU:
- 09344482
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$15.95 -
COMETIC Stator Gasket - Honda EC586032AFM
COMETIC
$9.95A quality stator cover gasket is critical to preventing oil seepage and maintaining engine integrity during high-RPM operation. The COMETIC Stator Gasket eliminates the frustration of repetitive gasket failure and time-consuming removal procedures,...09344477- SKU:
- 09344477
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
$9.95 -
COMETIC Crank Seal Kit C7653
COMETIC
$21.95Crank seal failure compromises engine integrity and can lead to costly oil leaks and contamination of your combustion chamber. The COMETIC Crank Seal Kit C7653 provides OE-quality sealing engineered for high-performance applications, delivering the...09344314- SKU:
- 09344314
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OIL
$21.95 -
COMETIC Top End Gasket Set - Yamaha C7530
COMETIC
$26.95A quality top end gasket set is non-negotiable for any engine rebuild or high-output application—factory gaskets simply can't handle the cylinder pressures of modern performance builds. The Cometic C7530 uses multi-layered steel construction with Viton...09344310- SKU:
- 09344310
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 87.50 MM
$26.95 -
COMETIC Exhaust Gasket - Yamaha C7507EX
COMETIC
$10.95Exhaust gasket failure leads to catastrophic leaks, power loss, and costly engine damage—especially under high heat and boost conditions. The COMETIC C7507EX is engineered for Yamaha 4-stroke applications with dual-layer construction that withstands...09344305- SKU:
- 09344305
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- EXHAUST
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$10.95 -
COMETIC Top End Gasket Set - Honda C7466
COMETIC
$34.95A failing top end gasket can cost you horsepower, reliability, and race time. The COMETIC C7466 uses multi-layered steel construction with Viton rubber coating to handle extreme cylinder pressures in both naturally aspirated and boosted applications,...09344302- SKU:
- 09344302
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS METRIC:
- 0.31 MM
- THICKNESS IMPERIAL:
- 0,012'
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 57.70 MM
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$34.95 -
COMETIC Top End Gasket Set - Yamaha C7252
COMETIC
$36.95A failed head gasket doesn't just sideline your engine—it compromises combustion efficiency, cylinder pressure retention, and ultimately your power output. The COMETIC Top End Gasket Set C7252 delivers the sealing integrity and thermal management your...09344261- SKU:
- 09344261
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
$36.95 -
COMETIC Exhaust Gasket - KTM C3222EX
COMETIC
$8.95Exhaust gasket failure leads to leaks, power loss, and costly engine damage—especially in high-heat environments. The COMETIC C3222EX delivers reliable, leak-free sealing under extreme temperatures and over-torque conditions, keeping your KTM 4-stroke...09344112- SKU:
- 09344112
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
$8.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0009
HOT RODS
$34.95A leaking water pump compromises engine cooling and can lead to catastrophic overheating on the track or street. The HOT RODS Water Pump Repair Kit (WPK0009) gives you the precision bearings and seals needed to restore your Honda's cooling system to OEM...09342921- SKU:
- 09342921
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$34.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0004
HOT RODS
$110.95A failing water pump can quickly escalate from a minor leak into catastrophic engine damage. This HOT RODS repair kit gives you everything needed to restore your Honda's cooling system without replacing the entire pump—saving time and money while...09342916- SKU:
- 09342916
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$110.95 -
On Sale
ATHENA Gasket Kit - YZ250 P400485160183
ATHENA
MSRP: $32.95Now: $30.00Was: $32.95The ATHENA Gasket Kit P400485160183 is engineered for YZ250 owners who demand reliability and sustained performance in high-heat environments. Factory gasket sets deteriorate under repeated thermal cycles, compromising compression and allowing coolant...09342584- SKU:
- 09342584
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- BORE SIZE:
- 72,00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 293 CC
- BORE SIZE METRIC:
- 72.00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $32.95Now: $30.00Was: $32.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600047
ATHENA
MSRP: $86.95Now: $78.00Was: $86.95Engine freshening before a race requires precision components that won't compromise reliability when it matters most. The ATHENA Top End Gasket Kit delivers OEM-quality sealing for pro, semi-pro, and amateur applications—giving you the flexibility to run...09342577- SKU:
- 09342577
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $86.95Now: $78.00Was: $86.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600239
ATHENA
MSRP: $102.95Now: $93.00Was: $102.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures a proper seal on your Honda's critical combustion chamber surfaces. This kit gives you the flexibility to run standard fuel with stock...09342573- SKU:
- 09342573
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $102.95Now: $93.00Was: $102.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850187
ATHENA
MSRP: $98.95Now: $89.00Was: $98.95A complete top-end rebuild demands gaskets that can handle extreme temperatures and maintain compression cycle after cycle. The ATHENA Complete Gasket Kit delivers the reliability you need with factory-quality construction across every critical seal...09342542- SKU:
- 09342542
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $98.95Now: $89.00Was: $98.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600098
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Engine freshening before race season requires precision-engineered gaskets that can handle varying fuel grades and compression ratios without compromise. The ATHENA Top End Gasket Kit gives you the flexibility to run either pump gas with stock...09342536- SKU:
- 09342536
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $73.95Now: $67.00Was: $73.95
