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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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 -
On Sale
ATHENA Race Gasket Kit - Kawasaki R2506-066
ATHENA
MSRP: $53.95Now: $49.00Was: $53.95Engine gasket condition is critical to maintaining compression integrity and preventing mid-race failures. The ATHENA Race Gasket Kit gives you the flexibility to optimize your compression ratio based on fuel choice, whether you're running pump gas at...09345864- SKU:
- 09345864
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
MSRP: $53.95Now: $49.00Was: $53.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475002
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95Cooling system integrity depends on proper sealing, and worn gaskets are a leading cause of coolant leaks and overheating. The ATHENA Water Pump Gasket Kit delivers OEM-equivalent sealing surfaces with precision-cut gasket material and matched oil seals,...09346038- SKU:
- 09346038
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475004
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95A failing water pump gasket doesn't just leak—it compromises your engine's cooling system and can lead to catastrophic overheating. The ATHENA Water Pump Gasket Kit supplies all the critical sealing components needed to restore proper coolant circulation...09346040- SKU:
- 09346040
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475005
ATHENA
MSRP: $30.95Now: $28.00Was: $30.95Water pump gasket failure is one of the most common causes of coolant leaks and engine overheating in Honda applications. This ATHENA gasket kit provides OEM-quality replacements for all critical sealing surfaces, eliminating the need to source...09346041- SKU:
- 09346041
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $30.95Now: $28.00Was: $30.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475007
ATHENA
MSRP: $31.95Now: $29.00Was: $31.95Cooling system leaks waste time and money—they sideline your engine before you hit peak performance. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing components designed to eliminate weeping and blowouts on your Honda platform. With...09346043- SKU:
- 09346043
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
MSRP: $31.95Now: $29.00Was: $31.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475009
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95A failing water pump gasket can silently compromise your cooling system, leading to overheating and catastrophic engine damage. The ATHENA Water Pump Gasket Kit gives you all the critical sealing components needed for a complete, reliable water pump...09346045- SKU:
- 09346045
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475010
ATHENA
MSRP: $26.95Now: $24.00Was: $26.95A failing water pump gasket can compromise your entire cooling system, leading to costly overheating and engine damage. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing across all critical contact points, ensuring reliable coolant...09346046- SKU:
- 09346046
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $26.95Now: $24.00Was: $26.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475002
ATHENA
MSRP: $24.95Now: $22.00Was: $24.95Cooling system leaks compromise engine performance and reliability, making a quality gasket kit essential for any rebuild or maintenance interval. The ATHENA Water Pump Gasket Kit delivers OEM-equivalent sealing across critical engine interfaces,...09346064- SKU:
- 09346064
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $24.95Now: $22.00Was: $24.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475003
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A failing water pump gasket doesn't just leak—it compromises your engine's cooling system and can lead to catastrophic overheating during critical race sessions or trail rides. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing components...09346065- SKU:
- 09346065
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475004
ATHENA
MSRP: $25.95Now: $23.00Was: $25.95Cooling system integrity is non-negotiable in high-performance applications—a failed water pump gasket means catastrophic overheating and potential engine damage. The ATHENA Water Pump Gasket Kit delivers OEM-equivalent sealing with all the supporting...09346066- SKU:
- 09346066
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $25.95Now: $23.00Was: $25.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475005
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95Coolant leaks and seal failures don't just waste fluid—they compromise engine temperature regulation and can lead to catastrophic overheating. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing surfaces across all critical junction points,...09346067- SKU:
- 09346067
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475007
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Proper sealing is critical to engine longevity, and factory gaskets degrade with thermal cycling and age. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing surfaces to prevent coolant leaks and oil weeping that compromise performance and...09346069- SKU:
- 09346069
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $39.95Now: $36.00Was: $39.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475011
ATHENA
MSRP: $48.95Now: $44.00Was: $48.95Seal leaks at the source with ATHENA's precision-engineered gasket kit, engineered to eliminate coolant and oil seepage that compromise engine reliability and performance. Whether you're rebuilding after a full teardown or performing preventive...09346073- SKU:
- 09346073
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $48.95Now: $44.00Was: $48.95 -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475012
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95Cooling system leaks compromise engine performance and reliability—a single failed gasket can force you off the track or leave you stranded. The ATHENA Water Pump Gasket Kit delivers OEM-equivalent sealing with precision-engineered components designed...09346074- SKU:
- 09346074
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475011
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Include water pump gasket, clutch cover gasket, water pump shaft oil seals and washers, Kit contents will vary slightly based on application, Kits do not contain replacement bearings09346093- SKU:
- 09346093
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $39.95Now: $36.00Was: $39.95 -
On Sale
ATHENA Gasket Kit - YZ125 - 58 mm P400485160014
ATHENA
MSRP: $81.95Now: $74.00Was: $81.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09341578- SKU:
- 09341578
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- BORE SIZE:
- 58,00 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 58.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $81.95Now: $74.00Was: $81.95 -
On Sale
ATHENA Gasket Kit - CRF250 P400210160007
ATHENA
MSRP: $104.95Now: $94.00Was: $104.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09341054- SKU:
- 09341054
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE:
- 82,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- UNITS:
- KIT
MSRP: $104.95Now: $94.00Was: $104.95 -
On Sale
ATHENA Gasket Kit - YZ125 P400485160010
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09341055- SKU:
- 09341055
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 54,00 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 54.00 MM
MSRP: $58.95Now: $53.00Was: $58.95 -
On Sale
ATHENA Gasket Kit - YZF450 P400485160013
ATHENA
MSRP: $122.95Now: $111.00Was: $122.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09341057- SKU:
- 09341057
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- BORE SIZE:
- 98,00 MM
- BORE SIZE METRIC:
- 98.00 MM
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $122.95Now: $111.00Was: $122.95
