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
-
COMETIC Top End Gasket Set C7726
COMETIC
$35.95A quality gasket set is non-negotiable when rebuilding or refreshing your top end—poor sealing compromises power, reliability, and longevity. The COMETIC C7726 uses multi-layered steel construction with Viton rubber coating to handle the extreme...09341037- SKU:
- 09341037
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 75.00 MM
- PRODUCT NAME:
- GASKET KIT
$35.95Qty in Cart: 0Quantity:Price:$35.95Subtotal: -
COMETIC Bottom End Gasket Set - Yamaha C3057BE
COMETIC
$95.50A proper engine rebuild demands precision at every level—and the bottom end is where reliability is sealed. The COMETIC C3057BE Bottom End Gasket Set supplies OEM-engineered seals and gaskets that prevent oil leakage, maintain pressure integrity, and...09344080- SKU:
- 09344080
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
$95.50 -
COMETIC Top End Gasket Set - Kawasaki C3501
COMETIC
$35.65A quality top-end gasket set is non-negotiable if you're planning an engine rebuild or refresh—factory gaskets can't handle the cylinder pressures of modern performance engines, especially in boosted applications. COMETIC's Kawasaki C3501 set uses...09344186- SKU:
- 09344186
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 48.50 MM
- RIDING STYLE:
- OFF-ROAD
$35.65 -
COMETIC Top End Gasket Set - KTM C3503
COMETIC
$36.95A failing top-end gasket will cost you far more than the price of this kit—lost compression, oil weeping, and catastrophic engine damage happen fast on high-output 4-stroke machines. The COMETIC C3503 gasket set is engineered to handle the extreme...09344189- SKU:
- 09344189
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 39.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
$36.95 -
COMETIC Bottom End Gasket Set - KTM C3517
COMETIC
$50.35A complete bottom end gasket kit is essential for any engine rebuild—sealing leaks and maintaining compression are non-negotiable for reliability and performance. COMETIC's C3517 gasket set includes every seal, O-ring, and washer needed to properly...09344200- SKU:
- 09344200
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- BOTTOM END
- MODEL:
- HI-PERFORMANCE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$50.35 -
COMETIC Top End Gasket Set - Kawasaki C3541
COMETIC
$35.65A quality top-end gasket set is critical to maintaining reliable compression and preventing combustion blow-by, especially when running elevated boost or high naturally-aspirated power levels. The COMETIC C3541 combines multi-layered steel construction...09344208- SKU:
- 09344208
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- THICKNESS IMPERIAL:
- 0,012'
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.31 MM
- BORE SIZE METRIC:
- 48.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$35.65 -
COMETIC Top End Gasket Set - Yamaha C3550-EST
COMETIC
$79.75A quality top end gasket set is non-negotiable for engines pushing high horsepower and cylinder pressure—factory gaskets simply aren't engineered to handle sustained boost or naturally aspirated outputs. The COMETIC C3550-EST uses multi-layered steel...09344213- SKU:
- 09344213
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
- THICKNESS IMPERIAL:
- 0,027'
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
- THICKNESS METRIC:
- 0.69 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
$79.75 -
COMETIC Stator Gasket - Honda EC1078015AFM
COMETIC
$12.55Factory stator cover gaskets fail prematurely due to heat cycling and limited sealing surfaces on modern engine cases—and traditional gaskets stick to the case, turning a 15-minute job into an hour of scraping and frustration. The COMETIC Stator Gasket...09344371- SKU:
- 09344371
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
$12.55 -
COMETIC Stator Gasket - Kawasaki EC1081032AFM
COMETIC
$16.95Stator cover gasket failures lead to oil seepage, contaminated ignition systems, and costly engine damage. The COMETIC Stator Gasket eliminates the frustration of repeated failures and difficult replacements by combining a bonded aluminum core with AFM...09344372- SKU:
- 09344372
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
- TYPE:
- STATOR COVER
- RIDING STYLE:
- OFF-ROAD
$16.95Qty in Cart: 0Quantity:Price:$16.95Subtotal: -
COMETIC Clutch Gasket - Kawasaki EC1102018AFM
COMETIC
$9.40Clutch cover gasket failure leads to oil seepage, contamination, and costly engine rebuilds. The COMETIC EC1102018AFM eliminates these headaches with an AFM composite construction that delivers a superior seal without sealants, reducing installation time...09344376- SKU:
- 09344376
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$9.40 -
COMETIC Clutch Gasket - Suzuki EC1153032AFM
COMETIC
$15.95A quality clutch gasket is non-negotiable for maintaining a reliable seal and preventing oil weepage that compromises performance and cleanliness. The COMETIC Clutch Gasket uses AFM material—a chemically blown nitrile synthetic rubber bonded to an...09344379- SKU:
- 09344379
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
COMETIC Clutch Gasket - Kawasaki EC1184032AFM
COMETIC
$16.75A quality clutch gasket is critical to preventing oil seepage and maintaining consistent clutch engagement—degraded gaskets lead to costly fluid loss and potential clutch contamination. COMETIC's AFM gasket delivers superior sealing with an...09344384- SKU:
- 09344384
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- OFF-ROAD
$16.75 -
COMETIC Stator Gasket - Honda EC1416032AFM
COMETIC
$20.95If you're tired of gasket scraping and repeat leaks at the stator cover, the COMETIC AFM gasket eliminates both problems with its bonded aluminum core and superior sealing geometry. This gasket won't stick to your engine case, cutting service time...09344394- SKU:
- 09344394
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
$20.95 -
COMETIC Stator Gasket - Honda EC1545032AFM
COMETIC
$12.55OEM stator cover gaskets fail prematurely because they stick to engine cases, requiring destructive removal and costly downtime. The COMETIC Stator Gasket eliminates this problem with AFM material—a chemically blown nitrile-aluminum composite that...09344395- SKU:
- 09344395
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
$12.55 -
COMETIC Stator Gasket - Yamaha EC1942032AFM
COMETIC
$8.35A stator cover gasket failure means oil seepage, repeated teardowns, and lost track time. The COMETIC Stator Gasket eliminates the frustration of stuck gaskets and unreliable seals by combining an aluminum-reinforced core with AFM synthetic rubber—a...09344408- SKU:
- 09344408
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
$8.35 -
COMETIC Clutch Gasket - Yamaha EC470020F
COMETIC
$9.95A worn or failing clutch cover gasket leads to oil weeping, potential case damage, and costly downtime. The COMETIC Clutch Gasket eliminates these headaches with a dual-layer AFM construction that seals reliably without sealants, reduces service time,...09344462- SKU:
- 09344462
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
$9.95 -
COMETIC Exhaust Gasket EX361
COMETIC
$8.35A failed exhaust gasket doesn't just leak—it compromises your engine's sealing integrity and can lead to costly damage under high-heat conditions. The COMETIC Exhaust Gasket EX361 is engineered with dual-layer construction to handle extreme temperatures...09344534- SKU:
- 09344534
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 101.00 MM
- TYPE:
- EXHAUST
- UNITS:
- SET
$8.35Qty in Cart: 0Quantity:Price:$8.35Subtotal: -
COMETIC Exhaust Gasket EX456010S
COMETIC
$8.35Exhaust gasket failure is one of the quickest ways to compromise engine sealing and lose performance gains—especially under high heat and boost conditions. The COMETIC EX456010S delivers the thermal stability and structural integrity you need to keep...09344538- SKU:
- 09344538
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- BORE SIZE METRIC:
- 68.50 MM
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
$8.35 -
COMETIC Exhaust Gasket - Yamaha EX641
COMETIC
$14.65Exhaust gasket failure is one of the most common causes of performance loss and costly engine damage. The COMETIC EX641 eliminates guesswork with precision engineering designed to handle extreme combustion temperatures while resisting blow-outs from...09344541- SKU:
- 09344541
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 100.00 MM
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
$14.65 -
COMETIC Exhaust Gasket EX657
COMETIC
$12.55Exhaust gasket failure leads to costly leaks, lost horsepower, and potential engine damage—especially under high-heat or high-boost conditions. The COMETIC EX657 is engineered to seal reliably across extreme temperature ranges, eliminating the risk of...09344545- SKU:
- 09344545
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- TYPE:
- EXHAUST
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- BORE SIZE METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$12.55
