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
ATHENA Complete Gasket Kit - Kawasaki P400250900069
ATHENA
MSRP: $260.95Now: $235.00Was: $260.95A failed gasket can compromise your entire engine—leading to coolant leaks, oil seepage, and catastrophic performance loss. The ATHENA Complete Gasket Kit delivers the sealing integrity your Kawasaki...09346467- SKU:
- 09346467
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $260.95Now: $235.00Was: $260.95 -
On Sale
ATHENA Race Gasket Kit - Kawasaki R2506-069
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Race Gasket Kit gives you the flexibility to optimize your engine's compression ratio without a complete...09346469- SKU:
- 09346469
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $54.95Now: $49.00Was: $54.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485900213
ATHENA
MSRP: $181.95Now: $156.00Was: $181.95Engine gasket failure compromises compression, causes coolant and oil leaks, and can lead to catastrophic internal damage if not addressed. The ATHENA Complete Gasket Kit provides OEM-equivalent...09346471- SKU:
- 09346471
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $181.95Now: $156.00Was: $181.95 -
On Sale
ATHENA Race Gasket Kit - Yamaha R4856-213
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Engine gasket degradation is one of the most common reasons for compression loss and mid-season performance drops. The ATHENA Race Gasket Kit R4856-213 gives you the precision components to refresh...09346472- SKU:
- 09346472
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ENGINE
- UNITS:
- KIT
MSRP: $72.95Now: $66.00Was: $72.95 -
On Sale
ATHENA Race Gasket Kit - Honda R2106-317
ATHENA
MSRP: $75.55Now: $65.00Was: $75.55High-revving engines demand gaskets that can handle sustained combustion pressures without failure—and the ATHENA Race Gasket Kit delivers exactly that. Built with rubber-coated spring steel and...09345462- SKU:
- 09345462
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $75.55Now: $65.00Was: $75.55Qty in Cart: 0Quantity:Price:MSRP: $75.55Now: $65.00Was: $75.55Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600317
ATHENA
MSRP: $82.95Now: $75.00Was: $82.95A failing head gasket can compromise your entire engine's integrity, leading to coolant leaks, combustion blow-by, and catastrophic overheating. The ATHENA Top End Gasket Kit uses advanced...09345463- SKU:
- 09345463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $82.95Now: $75.00Was: $82.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600077
ATHENA
MSRP: $98.95Now: $85.00Was: $98.95Head gasket failure can sideline your engine and drain your wallet—the ATHENA Top End Gasket Kit is engineered to prevent catastrophic leaks and maintain compression integrity across extreme...09345465- SKU:
- 09345465
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $98.95Now: $85.00Was: $98.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900077
ATHENA
MSRP: $243.95Now: $209.00Was: $243.95A complete gasket kit is your engine's first line of defense against compression loss, coolant leaks, and thermal stress. The ATHENA P400270900077 delivers OEM-equivalent sealing performance with...09345466- SKU:
- 09345466
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $243.95Now: $209.00Was: $243.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600078
ATHENA
MSRP: $102.95Now: $88.00Was: $102.95A quality top-end gasket kit is essential for maintaining cylinder head integrity and preventing coolant or oil leakage under high-temperature operating conditions. The ATHENA P400270600078 combines...09345471- SKU:
- 09345471
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $102.95Now: $88.00Was: $102.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900078
ATHENA
MSRP: $192.95Now: $165.00Was: $192.95Gasket failure is one of the most common culprits behind coolant leaks, compression loss, and catastrophic engine damage—especially under high heat and boost conditions. The ATHENA Complete Gasket...09345472- SKU:
- 09345472
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $192.95Now: $165.00Was: $192.95Qty in Cart: 0Quantity:Price:MSRP: $192.95Now: $165.00Was: $192.95Subtotal: -
On Sale
ATHENA Race Gasket Kit - Husqvarna R2706-079
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95Factory gasket seals degrade under sustained high-temperature racing conditions, leading to compression loss and potential engine damage. The ATHENA Race Gasket Kit delivers the thermal stability and...09345474- SKU:
- 09345474
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $57.95Now: $52.00Was: $57.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600079
ATHENA
MSRP: $129.95Now: $117.00Was: $129.95Head gasket failure can strand you trackside or leave your engine compromised. The ATHENA Top End Gasket Kit delivers dependable sealing across extreme temperature swings, ensuring your Husqvarna...09345475- SKU:
- 09345475
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $129.95Now: $117.00Was: $129.95 -
On Sale
ATHENA Race Gasket Kit - Husqvarna R2706-081
ATHENA
MSRP: $71.95Now: $61.00Was: $71.95Head gasket failure can end your race day before it starts—and the ATHENA Race Gasket Kit R2706-081 is engineered to prevent that. Built with rubber-coated spring steel construction and...09345478- SKU:
- 09345478
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $71.95Now: $61.00Was: $71.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600081
ATHENA
MSRP: $103.95Now: $89.00Was: $103.95Head gasket failure can cost you races and credibility. The ATHENA Top End Gasket Kit is engineered to maintain a perfect seal under extreme combustion pressures and thermal cycling, ensuring your...09345479- SKU:
- 09345479
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $103.95Now: $89.00Was: $103.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900081
ATHENA
MSRP: $188.95Now: $170.00Was: $188.95A complete gasket kit is the foundation of a reliable engine—seal failure leads to oil leaks, compression loss, and catastrophic damage. The ATHENA Complete Gasket Kit for your Husqvarna...09345480- SKU:
- 09345480
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
MSRP: $188.95Now: $170.00Was: $188.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600067
ATHENA
MSRP: $87.95Now: $79.00Was: $87.95Head gasket failure means downtime and costly engine damage—especially when you're pushing performance limits. The ATHENA Top End Gasket Kit delivers reliable sealing across extreme temperature...09345484- SKU:
- 09345484
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $87.95Now: $79.00Was: $87.95Qty in Cart: 0Quantity:Price:MSRP: $87.95Now: $79.00Was: $87.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900067
ATHENA
MSRP: $245.95Now: $221.00Was: $245.95Gasket failure leads to compression loss, coolant leaks, and catastrophic engine damage—especially under high RPM or forced induction loads. The ATHENA Complete Gasket Kit eliminates these risks with...09345485- SKU:
- 09345485
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $245.95Now: $221.00Was: $245.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510900095
ATHENA
MSRP: $246.95Now: $222.00Was: $246.95Gasket failure can compromise your engine's integrity and leave you stranded mid-season. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance with premium materials engineered...09345488- SKU:
- 09345488
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $246.95Now: $222.00Was: $246.95Qty in Cart: 0Quantity:Price:MSRP: $246.95Now: $222.00Was: $246.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510900098
ATHENA
MSRP: $221.95Now: $200.00Was: $221.95Gasket failure can compromise your entire engine's integrity, leading to compression loss, coolant leaks, and catastrophic damage. The ATHENA Complete Gasket Kit is engineered to maintain a reliable...09345489- SKU:
- 09345489
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $221.95Now: $200.00Was: $221.95 -
On Sale
ATHENA Complete Gasket Kit - KTM/Husqvarna P400270160082
ATHENA
MSRP: $71.95Now: $65.00Was: $71.95When rebuilding a KTM or Husqvarna top-end, gasket failure isn't an option. This Athena complete gasket kit eliminates guesswork by delivering OEM-quality seals engineered to withstand extreme...09345491- SKU:
- 09345491
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- -
- UNITS:
- KIT
- BORE SIZE METRIC:
- 82.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
MSRP: $71.95Now: $65.00Was: $71.95
