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 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 rebuild. This kit includes a premium MLSS head gasket and...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: $172.95Now: $156.00Was: $172.95Engine 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 sealing across your entire top-end assembly, ensuring...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: $172.95Now: $156.00Was: $172.95 -
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 your top-end without a complete rebuild, letting you...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 engineered for extreme thermal cycling, this kit maintains...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 rubber-coated spring steel construction to maintain a consistent,...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: $93.95Now: $85.00Was: $93.95Head 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 operating conditions. Built with rubber-coated spring steel and...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: $93.95Now: $85.00Was: $93.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900077
ATHENA
MSRP: $231.95Now: $209.00Was: $231.95A 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 materials engineered specifically for high-temperature...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: $231.95Now: $209.00Was: $231.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600078
ATHENA
MSRP: $97.95Now: $88.00Was: $97.95A 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 durable spring steel construction with advanced sealing...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: $97.95Now: $88.00Was: $97.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900078
ATHENA
MSRP: $182.95Now: $165.00Was: $182.95Gasket 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 Kit delivers factory-grade sealing integrity with...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: $182.95Now: $165.00Was: $182.95 -
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 spring-back retention required for consistent...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 P400 engine maintains compression and performance when it...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: $67.95Now: $61.00Was: $67.95Head 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 high-temperature silicone beading on critical sealing surfaces, this...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: $67.95Now: $61.00Was: $67.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600081
ATHENA
MSRP: $98.95Now: $89.00Was: $98.95Head 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 Husqvarna P400 engine performs reliably race after race...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: $98.95Now: $89.00Was: $98.95 -
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 P400270900081 combines high-strength materials with precision...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 swings and high combustion pressures, so you can focus on...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 multi-layer construction and precision engineering...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 to handle extreme temperatures and sustained high-RPM...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 seal across all critical engine surfaces, even under...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 combustion temperatures and high RPM loads. A single failed...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 -
On Sale
ATHENA Race Gasket Kit - Kawasaki R2506-065
ATHENA
MSRP: $44.95Now: $40.00Was: $44.95Whether you're prepping for race day or executing a mid-season engine refresh, compression ratio directly impacts your engine's power delivery and fuel efficiency. The ATHENA Race Gasket Kit gives you the flexibility to optimize for either standard or...09345863- SKU:
- 09345863
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
- TYPE:
- TOP END
MSRP: $44.95Now: $40.00Was: $44.95
