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
-
On Sale
COMETIC Top End Gasket Set - Husqvarna C7734
COMETIC
MSRP: $29.95Now: $26.96Was: $29.95A top-end gasket failure can sideline your build and compromise engine integrity. COMETIC's multi-layered steel construction with Viton rubber coating is engineered to handle the extreme pressures of...C7734- SKU:
- C7734
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 54.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $29.95Now: $26.96Was: $29.95Qty in Cart: 0Quantity:Price:MSRP: $29.95Now: $26.96Was: $29.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Honda C7757
COMETIC
MSRP: $47.95Now: $43.16Was: $47.95A quality top-end gasket set is non-negotiable for engine longevity and performance consistency. The COMETIC C7757 delivers multi-layered steel construction with Viton rubber coating designed to...C7757- SKU:
- C7757
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 54.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $47.95Now: $43.16Was: $47.95Qty in Cart: 0Quantity:Price:MSRP: $47.95Now: $43.16Was: $47.95Subtotal: -
On Sale
COMETIC Bottom End Gasket Set - Yamaha C3057BE
COMETIC
MSRP: $90.95Now: $81.86Was: $90.95A 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...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
MSRP: $90.95Now: $81.86Was: $90.95 -
On Sale
COMETIC Top End Gasket Set - Kawasaki C3501
COMETIC
MSRP: $33.95Now: $30.56Was: $33.95A 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...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
MSRP: $33.95Now: $30.56Was: $33.95 -
On Sale
COMETIC Top End Gasket Set - KTM C3503
COMETIC
MSRP: $36.95Now: $33.26Was: $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...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
MSRP: $36.95Now: $33.26Was: $36.95 -
On Sale
COMETIC Bottom End Gasket Set - KTM C3517
COMETIC
MSRP: $47.95Now: $43.16Was: $47.95A 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...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
MSRP: $47.95Now: $43.16Was: $47.95Qty in Cart: 0Quantity:Price:MSRP: $47.95Now: $43.16Was: $47.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Kawasaki C3541
COMETIC
MSRP: $33.95Now: $30.56Was: $33.95A 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...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
MSRP: $33.95Now: $30.56Was: $33.95Qty in Cart: 0Quantity:Price:MSRP: $33.95Now: $30.56Was: $33.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Yamaha C3550-EST
COMETIC
MSRP: $75.95Now: $68.36Was: $75.95A 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...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
MSRP: $75.95Now: $68.36Was: $75.95 -
On Sale
COMETIC Stator Gasket - Honda EC1078015AFM
COMETIC
MSRP: $11.95Now: $10.76Was: $11.95Factory 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...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
MSRP: $11.95Now: $10.76Was: $11.95Qty in Cart: 0Quantity:Price:MSRP: $11.95Now: $10.76Was: $11.95Subtotal: -
On Sale
COMETIC Stator Gasket - Kawasaki EC1081032AFM
COMETIC
MSRP: $16.95Now: $15.26Was: $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...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
MSRP: $16.95Now: $15.26Was: $16.95Qty in Cart: 0Quantity:Price:MSRP: $16.95Now: $15.26Was: $16.95Subtotal: -
On Sale
COMETIC Clutch Gasket - Kawasaki EC1102018AFM
COMETIC
MSRP: $8.95Now: $8.06Was: $8.95Clutch 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...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
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
COMETIC Clutch Gasket - Kawasaki EC1184032AFM
COMETIC
MSRP: $15.95Now: $14.36Was: $15.95A 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...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
MSRP: $15.95Now: $14.36Was: $15.95 -
On Sale
COMETIC Stator Gasket - Honda EC1416032AFM
COMETIC
MSRP: $19.95Now: $17.96Was: $19.95If 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...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
MSRP: $19.95Now: $17.96Was: $19.95Qty in Cart: 0Quantity:Price:MSRP: $19.95Now: $17.96Was: $19.95Subtotal: -
On Sale
COMETIC Stator Gasket - Honda EC1545032AFM
COMETIC
MSRP: $11.95Now: $10.76Was: $11.95OEM 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...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
MSRP: $11.95Now: $10.76Was: $11.95Qty in Cart: 0Quantity:Price:MSRP: $11.95Now: $10.76Was: $11.95Subtotal: -
On Sale
COMETIC Stator Gasket - Yamaha EC1942032AFM
COMETIC
MSRP: $7.95Now: $7.16Was: $7.95A 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...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
MSRP: $7.95Now: $7.16Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.16Was: $7.95Subtotal: -
On Sale
COMETIC Clutch Gasket - Yamaha EC470020F
COMETIC
MSRP: $9.95Now: $8.96Was: $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...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
MSRP: $9.95Now: $8.96Was: $9.95 -
On Sale
COMETIC Exhaust Gasket EX361
COMETIC
MSRP: $7.95Now: $7.16Was: $7.95A 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...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
MSRP: $7.95Now: $7.16Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.16Was: $7.95Subtotal: -
On Sale
COMETIC Exhaust Gasket EX456010S
COMETIC
MSRP: $7.95Now: $7.16Was: $7.95Exhaust 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...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
MSRP: $7.95Now: $7.16Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.16Was: $7.95Subtotal: -
On Sale
COMETIC Exhaust Gasket - Yamaha EX641
COMETIC
MSRP: $13.95Now: $12.56Was: $13.95Exhaust 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...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
MSRP: $13.95Now: $12.56Was: $13.95 -
On Sale
COMETIC Exhaust Gasket EX657
COMETIC
MSRP: $11.95Now: $10.76Was: $11.95Exhaust 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...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
MSRP: $11.95Now: $10.76Was: $11.95
