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
-
PROX Crank Seal Kit - KTM65SX 42.6029
PROX
$19.95OEM quality, All seals necessary for complete crank rebuild included09350320- SKU:
- 09350320
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- TYPE:
- OIL
$19.95Qty in Cart: 0Quantity:Price:$19.95Subtotal: -
PROX Crank Seal Kit - KTM85SX 42.6103
PROX
$24.95OEM quality, All seals necessary for complete crank rebuild included09350321- SKU:
- 09350321
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
- TYPE:
- OIL
- APPLICATION:
- CRANKSHAFT
$24.95 -
PROX Crank Seal Kit 42.6218
PROX
$14.95OEM quality, All seals necessary for complete crank rebuild included09350322- SKU:
- 09350322
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
$14.95Qty in Cart: 0Quantity:Price:$14.95Subtotal: -
PROX Crank Seal Kit - KTM250/300 42.6320
PROX
$19.95OEM quality, All seals necessary for complete crank rebuild included09350323- SKU:
- 09350323
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
- TYPE:
- OIL
$19.95 -
PROX Gasket Kit - Complete - Honda 34.1115
PROX
$79.95PROX Gasket Kit - Complete - Honda09345517- SKU:
- 09345517
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$79.95 -
PROX Gasket Kit - Complete - Honda 34.1223
PROX
$104.95PROX Gasket Kit - Complete - Honda09345521- SKU:
- 09345521
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$104.95 -
PROX Gasket Kit - Complete - Honda 34.1227
PROX
$199.95PROX Gasket Kit - Complete - Honda09345523- SKU:
- 09345523
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$199.95 -
PROX Gasket Kit - Complete - Honda 34.1312
PROX
$99.95PROX Gasket Kit - Complete - Honda09345524- SKU:
- 09345524
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
PROX Gasket Kit - Complete - Honda 34.1409
PROX
$104.95PROX Gasket Kit - Complete - Honda09345534- SKU:
- 09345534
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
PROX Gasket Kit - Complete - Honda 34.1422
PROX
$214.95PROX Gasket Kit - Complete - Honda09345536- SKU:
- 09345536
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$214.95 -
PROX Gasket Kit - Complete - Yamaha 34.2218
PROX
$69.95PROX Gasket Kit - Complete - Yamaha09345546- SKU:
- 09345546
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$69.95Qty in Cart: 0Quantity:Price:$69.95Subtotal: -
PROX Gasket Kit - Complete - Yamaha 34.2222
PROX
$74.95PROX Gasket Kit - Complete - Yamaha09345548- SKU:
- 09345548
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$74.95 -
PROX Gasket Kit - Complete - Yamaha 34.2225
PROX
$94.95PROX Gasket Kit - Complete - Yamaha09345549- SKU:
- 09345549
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$94.95 -
PROX Gasket Kit - Complete - Yamaha 34.2312
PROX
$74.95PROX Gasket Kit - Complete - Yamaha09345553- SKU:
- 09345553
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
$74.95 -
PROX Gasket Kit - Complete - Yamaha 34.2317
PROX
$74.95PROX Gasket Kit - Complete - Yamaha09345555- SKU:
- 09345555
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$74.95 -
PROX Gasket Kit - Complete - Yamaha 34.2322
PROX
$79.95PROX Gasket Kit - Complete - Yamaha09345557- SKU:
- 09345557
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$79.95 -
PROX Gasket Kit - Complete - Yamaha 34.2401
PROX
$139.95PROX Gasket Kit - Complete - Yamaha09345558- SKU:
- 09345558
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$139.95 -
PROX Gasket Kit - Complete - Yamaha 34.2414
PROX
$104.95PROX Gasket Kit - Complete - Yamaha09345560- SKU:
- 09345560
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$104.95 -
PROX Gasket Kit - Complete - Yamaha 34.2418
PROX
$139.95PROX Gasket Kit - Complete - Yamaha09345561- SKU:
- 09345561
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$139.95 -
PROX Gasket Kit - Complete - Yamaha 34.2420
PROX
$139.95PROX Gasket Kit - Complete - Yamaha09345562- SKU:
- 09345562
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$139.95
