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
PROX Top End Gasket Set - KTM 35.6103
PROX
MSRP: $29.95Now: $25.00Was: $29.95PROX Top End Gasket Set - KTM09345776- SKU:
- 09345776
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $29.95Now: $25.00Was: $29.95Qty in Cart: 0Quantity:Price:MSRP: $29.95Now: $25.00Was: $29.95Subtotal: -
On Sale
PROX Top End Gasket Set - KTM 35.6248
PROX
MSRP: $29.95Now: $25.00Was: $29.95PROX Top End Gasket Set - KTM09345783- SKU:
- 09345783
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
MSRP: $29.95Now: $25.00Was: $29.95Qty in Cart: 0Quantity:Price:MSRP: $29.95Now: $25.00Was: $29.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Honda 57.1422
PROX
MSRP: $34.95Now: $30.00Was: $34.95PROX Water Pump Rebuild Kit - Honda09346993- SKU:
- 09346993
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $34.95Now: $30.00Was: $34.95 -
On Sale
PROX Water Pump Rebuild Kit - Honda 57.1515
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit - Honda09347000- SKU:
- 09347000
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Suzuki 57.3425
PROX
MSRP: $34.95Now: $30.00Was: $34.95PROX Water Pump Rebuild Kit - Suzuki09347035- SKU:
- 09347035
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
MSRP: $34.95Now: $30.00Was: $34.95Qty in Cart: 0Quantity:Price:MSRP: $34.95Now: $30.00Was: $34.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4026
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit - Kawasaki09347040- SKU:
- 09347040
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4315
PROX
MSRP: $44.95Now: $38.00Was: $44.95PROX Water Pump Rebuild Kit - Kawasaki09347047- SKU:
- 09347047
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $44.95Now: $38.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $38.00Was: $44.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4317
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit - Kawasaki09347049- SKU:
- 09347049
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $39.95Now: $34.00Was: $39.95 -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4319
PROX
MSRP: $44.95Now: $38.00Was: $44.95PROX Water Pump Rebuild Kit - Kawasaki09347051- SKU:
- 09347051
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $44.95Now: $38.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $38.00Was: $44.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Suzuki 57.4324
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit - Suzuki09347052- SKU:
- 09347052
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4429
PROX
MSRP: $34.95Now: $30.00Was: $34.95PROX Water Pump Rebuild Kit - Kawasaki09347060- SKU:
- 09347060
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
MSRP: $34.95Now: $30.00Was: $34.95Qty in Cart: 0Quantity:Price:MSRP: $34.95Now: $30.00Was: $34.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit 57.6316
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit09347072- SKU:
- 09347072
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit 57.6321
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit09347074- SKU:
- 09347074
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
MSRP: $39.95Now: $34.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $34.00Was: $39.95Subtotal: -
On Sale
PROX Water Pump Rebuild Kit 57.6324
PROX
MSRP: $39.95Now: $34.00Was: $39.95PROX Water Pump Rebuild Kit09347077- SKU:
- 09347077
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $39.95Now: $34.00Was: $39.95 -
On Sale
PROX Water Pump Rebuild Kit 57.6325
PROX
MSRP: $24.95Now: $21.00Was: $24.95PROX Water Pump Rebuild Kit09347078- SKU:
- 09347078
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $24.95Now: $21.00Was: $24.95Qty in Cart: 0Quantity:Price:MSRP: $24.95Now: $21.00Was: $24.95Subtotal: -
On Sale
PROX Top End Gasket Set - Yamaha 35.2018
PROX
MSRP: $29.95Now: $25.00Was: $29.95PROX Top End Gasket Set - Yamaha09347121- SKU:
- 09347121
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $29.95Now: $25.00Was: $29.95 -
On Sale
PROX Valve and Spring Kit 28.SES6351-1
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are made from premium chrome vanadium steel...09262726- SKU:
- 09262726
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STEEL
- TYPE:
- VALVE
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal: -
On Sale
PROX Valve and Spring Kit 28.SES6353-1
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are made from premium chrome vanadium steel...09262727- SKU:
- 09262727
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal: -
On Sale
PROX Valve and Spring Kit 28.SIS6351-2
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are made from premium chrome vanadium steel...09262730- SKU:
- 09262730
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- VALVE AND SPRING KIT
- APPLICATION:
- INTAKE
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal: -
On Sale
PROX Valve and Spring Kit 28.SIS6353-2
PROX
MSRP: $149.95Now: $127.00Was: $149.95Replaces the OEM valves and valve springs, Steel, nitrided valves for increased durability and less wear under extreme conditions, Stronger valve springs deal with the extra weight of the steel valves, Springs are made from premium chrome vanadium steel...09262731- SKU:
- 09262731
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- TYPE:
- VALVE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $149.95Now: $127.00Was: $149.95Qty in Cart: 0Quantity:Price:MSRP: $149.95Now: $127.00Was: $149.95Subtotal:
