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 Connecting Rod 03.1315
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly impacts power delivery, reliability, and engine longevity. The PROX Connecting Rod 03.1315 is...09230125- SKU:
- 09230125
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.1334
PROX
$173.95A connecting rod is the critical link between your piston and crankshaft—any weakness here compromises power transfer and engine reliability. The PROX 03.1334 arrives as a complete assembly,...09230127- SKU:
- 09230127
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- EACH
$173.95 -
PROX Connecting Rod 03.6220
PROX
$132.95A connecting rod is the critical link between your crankshaft and piston—responsible for transmitting combustion forces and managing the repetitive stress of high-RPM operation. The PROX Connecting...09230128- SKU:
- 09230128
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.4022
PROX
$109.95A connecting rod is the critical link between your piston and crankshaft—it must handle enormous forces under extreme RPMs without compromise. The PROX 03.4022 arrives as a complete assembly with all...09230130- SKU:
- 09230130
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
PROX Connecting Rod 03.4309
PROX
$132.95A connecting rod is the critical link between your crankshaft and piston—any flex, wear, or imbalance directly translates to power loss and reliability issues. The PROX 03.4309 is a complete,...09230131- SKU:
- 09230131
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- FORGED STEEL
$132.95 -
PROX Connecting Rod 03.4118
PROX
$116.95A connecting rod is the critical link between your piston and crankshaft—it transfers combustion force into rotational power while enduring extreme stress cycles. The PROX 03.4118 is a complete...09230132- SKU:
- 09230132
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$116.95 -
PROX Connecting Rod 03.2217
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft, transmitting combustion forces while enduring extreme reciprocating loads. The PROX 03.2217 is a complete assembly that...09230133- SKU:
- 09230133
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$132.95 -
PROX Connecting Rod 03.1105
PROX
$109.95A quality connecting rod is fundamental to engine reliability and power delivery—it's the critical link between your crankshaft and piston, handling extreme forces with every combustion cycle. The...09230134- SKU:
- 09230134
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
PROX Connecting Rod 03.3219
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—it must handle extreme forces with zero tolerance for failure. The PROX 03.3219 is engineered to deliver reliable power...09230135- SKU:
- 09230135
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$132.95 -
PROX Connecting Rod 03.2309
PROX
$132.95A connecting rod is the critical link between your crankshaft and piston—it must withstand extreme forces while maintaining precise tolerances. The PROX 03.2309 arrives as a complete assembly with...09230136- SKU:
- 09230136
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$132.95 -
PROX Connecting Rod 03.4108
PROX
$109.95A connecting rod is the critical link between your crankshaft and piston—its durability directly impacts engine reliability and power delivery. The PROX 03.4108 is a precision-engineered rod designed...09230137- SKU:
- 09230137
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$109.95 -
PROX Connecting Rod 03.3310
PROX
$132.95A connecting rod is the critical link between your crankshaft and piston—it must withstand extreme pressures, temperature swings, and rapid reciprocating forces without compromise. The PROX 03.3310...09230139- SKU:
- 09230139
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
- MATERIAL:
- FORGED STEEL
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.2306
PROX
$125.95A connecting rod is the critical link between your piston and crankshaft—if it fails, your engine does too. The PROX 03.2306 is a complete, pre-assembled connecting rod assembly that eliminates...09230140- SKU:
- 09230140
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- MATERIAL:
- FORGED STEEL
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$125.95 -
PROX Connecting Rod 03.6104
PROX
$109.95A connecting rod is the critical link between your piston and crankshaft—any flex, wear, or imbalance directly kills power delivery and reliability. The PROX 03.6104 is a complete, ready-to-install...09230141- SKU:
- 09230141
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- EACH
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
PROX Connecting Rod 03.2403
PROX
$173.95A connecting rod is the critical bridge between your piston and crankshaft—if it fails, your engine fails. The PROX 03.2403 is a complete, ready-to-install assembly that eliminates the need to source...09230142- SKU:
- 09230142
- Availability:
- Ships Same Business Day
- Weight:
- 1.19 LBS
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
$173.95 -
PROX Connecting Rod 03.2221
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly undermines engine reliability and power delivery. The PROX Connecting Rod 03.2221 is engineered...09230143- SKU:
- 09230143
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.2105
PROX
$112.95A connecting rod is the critical link between your crankshaft and piston, transferring combustion force while enduring extreme stress cycles. The PROX 03.2105 is engineered to handle high-RPM demands...09230144- SKU:
- 09230144
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- FORGED STEEL
$112.95 -
PROX Connecting Rod 03.2420
PROX
$183.95A connecting rod is the critical link between your crankshaft and piston, transmitting combustion forces while managing extreme stress and temperature cycles. The PROX 03.2420 delivers OEM-equivalent...09230145- SKU:
- 09230145
- Availability:
- Ships Same Business Day
- Weight:
- 1.52 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$183.95 -
PROX Connecting Rod 03.1322
PROX
$119.95A connecting rod is the critical link between your piston and crankshaft—it's under extreme stress with every combustion cycle, and a weak or worn unit can destroy an entire engine. The PROX...09230147- SKU:
- 09230147
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$119.95 -
PROX Connecting Rod 03.6311
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—it must handle extreme forces and maintain precision tolerances or your engine fails catastrophically. The PROX 03.6311 is a...09230148- SKU:
- 09230148
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$132.95
