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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COMETIC Stator Gasket - Yamaha EC292060AFM
COMETIC
$8.95Stator cover gaskets fail silently, causing oil weeps that damage ignition systems and compromise engine reliability. The Cometic AFM gasket eliminates repeat failures by bonding a rigid aluminum core to premium synthetic rubber, delivering a superior...09344430- SKU:
- 09344430
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$8.95 -
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
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
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 Exhaust Gasket C7399EX
COMETIC
$4.95Exhaust gasket failure is one of the most overlooked causes of performance loss and engine damage in high-output applications. The COMETIC C7399EX is engineered to withstand extreme combustion temperatures and over-torque situations that would compromise...09344298- SKU:
- 09344298
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 58.00 MM
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- EXHAUST
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$4.95Qty in Cart: 0Quantity:Price:$4.95Subtotal: -
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
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
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
$8.95Qty in Cart: 0Quantity:Price:$8.95Subtotal: -
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 WPK0005
HOT RODS
$34.95A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage if left unchecked. This HOT RODS repair kit provides OEM-quality replacement seals and bearings to restore your pump's integrity without the cost of a...09342917- SKU:
- 09342917
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- 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 - Suzuki P400510600045
ATHENA
MSRP: $101.80Now: $87.00Was: $101.80Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands. This kit empowers you to optimize your setup—run pump gas with stock compression for...09342582- SKU:
- 09342582
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $101.80Now: $87.00Was: $101.80Qty in Cart: 0Quantity:Price:MSRP: $101.80Now: $87.00Was: $101.80Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600053
ATHENA
MSRP: $96.95Now: $87.00Was: $96.95Engine performance hinges on precision gasket sealing, and the ATHENA Top End Gasket Kit delivers the reliability competitive riders demand when refreshing their powerplant before race season or mid-event maintenance. This kit eliminates guesswork by...09342580- SKU:
- 09342580
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $96.95Now: $87.00Was: $96.95Qty in Cart: 0Quantity:Price:MSRP: $96.95Now: $87.00Was: $96.95Subtotal: -
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 P400210600064
ATHENA
MSRP: $86.95Now: $78.00Was: $86.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands. This kit gives you flexibility—run stock compression with pump gas for reliability, or step up...09342574- SKU:
- 09342574
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET 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 Gasket Kit - YZ450F P400485160025
ATHENA
MSRP: $98.95Now: $89.00Was: $98.95The ATHENA Gasket Kit delivers the reliability and thermal management your YZ450F demands when you're pushing peak performance. Built with precision-engineered components and premium coatings, this kit ensures proper cylinder sealing and heat dissipation...09342555- SKU:
- 09342555
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 102,00 MM
- BORE SIZE METRIC:
- 102.00 MM
MSRP: $98.95Now: $89.00Was: $98.95Qty in Cart: 0Quantity:Price:MSRP: $98.95Now: $89.00Was: $98.95Subtotal: -
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 - Honda P400210600245
ATHENA
MSRP: $69.95Now: $63.00Was: $69.95Engine gasket integrity is critical to maintaining peak compression and preventing mid-race failures. The ATHENA Top End Gasket Kit gives you the flexibility to optimize your fuel strategy—run pump gas with stock compression or unleash higher compression...09342537- SKU:
- 09342537
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $69.95Now: $63.00Was: $69.95Qty in Cart: 0Quantity:Price:MSRP: $69.95Now: $63.00Was: $69.95Subtotal:
