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
PROX Crankshaft Oil Seal Set - Beta 42.7220
PROX
MSRP: $19.95Now: $17.00Was: $19.95Crankshaft Oil Seal Set - Beta Manufactered from high quality base materials and are made to OEM specs and tolerances to guarantee quality and superior durability, All seals necessary for complete crank rebuild included09351280- SKU:
- 09351280
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
MSRP: $19.95Now: $17.00Was: $19.95 -
On Sale
PROX Crankshaft Oil Seal Set - Beta 42.7350
PROX
MSRP: $29.95Now: $25.00Was: $29.95Crankshaft Oil Seal Set - Beta Manufactered from high quality base materials and are made to OEM specs and tolerances to guarantee quality and superior durability, All seals necessary for complete crank rebuild included09351281- SKU:
- 09351281
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
MSRP: $29.95Now: $25.00Was: $29.95 -
On Sale
PROX Connecting Rod Kit - Honda 03.1363
PROX
MSRP: $165.95Now: $141.00Was: $165.95Connecting Rod Kit - Honda Designed to exact OEM specifications, Double forged to maintain superior strength, durability and dimensional consistency through improved grain flow09230694- SKU:
- 09230694
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $165.95Now: $141.00Was: $165.95 -
On Sale
PROX Connecting Rod Kit - Yamaha 03.2018
PROX
MSRP: $109.95Now: $93.00Was: $109.95Connecting Rod Kit - 03.2018 Engineered to meet OEM specifications for flawless compatibility. Double forged construction ensures exceptional strength and longevity. Precision manufacturing enhances dimensional consistency for reliable...09230695- SKU:
- 09230695
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $109.95Now: $93.00Was: $109.95 -
On Sale
PROX Connecting Rod Kit - Yamaha 03.2232
PROX
MSRP: $119.95Now: $102.00Was: $119.95Connecting Rod Kit - Yamaha 03.2232 Engineered to meet original equipment manufacturer standards for perfect fit and performance. Double forged construction ensures exceptional strength and longevity under demanding conditions. Improved...09230696- SKU:
- 09230696
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $119.95Now: $102.00Was: $119.95 -
On Sale
PROX Connecting Rod Kit - Gas Gas | Yamaha 03.2432
PROX
MSRP: $175.95Now: $150.00Was: $175.95Connecting Rod Kit - Gas Gas | Yamaha Designed to exact OEM specifications, Double forged to maintain superior strength, durability and dimensional consistency through improved grain flow09230697- SKU:
- 09230697
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
MSRP: $175.95Now: $150.00Was: $175.95 -
On Sale
PROX Connecting Rod Kit - Husaberg | Husqvarna | KTM 03.6333
PROX
MSRP: $229.95Now: $195.00Was: $229.95Connecting Rod Kit - Husaberg | Husqvarna | KTM Designed to exact OEM specifications, Double forged to maintain superior strength, durability and dimensional consistency through improved grain flow09230699- SKU:
- 09230699
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $229.95Now: $195.00Was: $229.95 -
On Sale
PROX Connecting Rod Kit - Beta 03.7322
PROX
MSRP: $129.95Now: $110.00Was: $129.95Connecting Rod Kit - Beta Designed to exact OEM specifications, Double forged to maintain superior strength, durability and dimensional consistency through improved grain flow09230702- SKU:
- 09230702
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $129.95Now: $110.00Was: $129.95Qty in Cart: 0Quantity:Price:MSRP: $129.95Now: $110.00Was: $129.95Subtotal: -
On Sale
PROX Crankshaft Bearing/Seal Kit - Honda 23.CBS14005
PROX
MSRP: $129.95Now: $110.00Was: $129.95Crankshaft Bearing/Seal Kit - Honda Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240701- SKU:
- 09240701
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $129.95Now: $110.00Was: $129.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Kawasaki 23.CBS43051
PROX
MSRP: $99.95Now: $85.00Was: $99.95Crankshaft Bearing/Seal Kit - Kawasaki Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240702- SKU:
- 09240702
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $99.95Now: $85.00Was: $99.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS60001
PROX
MSRP: $35.95Now: $31.00Was: $35.95Crankshaft Bearing/Seal Kit - KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high durability...09240703- SKU:
- 09240703
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $35.95Now: $31.00Was: $35.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS60009
PROX
MSRP: $39.95Now: $34.00Was: $39.95Crankshaft Bearing/Seal Kit - KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high durability...09240704- SKU:
- 09240704
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $39.95Now: $34.00Was: $39.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM 23.CBS63013
PROX
MSRP: $175.95Now: $150.00Was: $175.95Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings...09240705- SKU:
- 09240705
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $175.95Now: $150.00Was: $175.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husqvarna/KTM 23.CBS63016
PROX
MSRP: $169.95Now: $144.00Was: $169.95Crankshaft Bearing/Seal Kit - Husqvarna/KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240706- SKU:
- 09240706
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $169.95Now: $144.00Was: $169.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS64007
PROX
MSRP: $159.95Now: $136.00Was: $159.95Crankshaft Bearing/Seal Kit - KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high durability...09240708- SKU:
- 09240708
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $159.95Now: $136.00Was: $159.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM 23.CBS64012
PROX
MSRP: $89.95Now: $76.00Was: $89.95Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings...09240709- SKU:
- 09240709
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $89.95Now: $76.00Was: $89.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Gas-Gas/Husqvarna/KTM 23.CBS64016
PROX
MSRP: $159.95Now: $136.00Was: $159.95Crankshaft Bearing/Seal Kit - Gas-Gas/Husqvarna/KTM Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings...09240710- SKU:
- 09240710
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $159.95Now: $136.00Was: $159.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Beta 23.CBS73013
PROX
MSRP: $69.95Now: $59.00Was: $69.95Crankshaft Bearing/Seal Kit - Beta Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240711- SKU:
- 09240711
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $69.95Now: $59.00Was: $69.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Beta 23.CBS73022
PROX
MSRP: $115.95Now: $99.00Was: $115.95Crankshaft Bearing/Seal Kit - Beta Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240712- SKU:
- 09240712
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $115.95Now: $99.00Was: $115.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Beta 23.CBS73050
PROX
MSRP: $99.95Now: $85.00Was: $99.95Crankshaft Bearing/Seal Kit - Beta Manufactured at leading OEM factories, Made to exact OEM specifications, to ensure maximum quality and performance, Includes all necessary bearings/seals for a component*s replacement, ProX bearings offer high...09240713- SKU:
- 09240713
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
MSRP: $99.95Now: $85.00Was: $99.95
