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 engineered for high-rpm applications where precision and...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, eliminating sourcing multiple components and ensuring precise...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 Rod 03.6220 arrives fully assembled with precision...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 necessary bearings and components, eliminating the...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, ready-to-install assembly that eliminates guesswork and weak...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 assembly engineered for reliability in high-RPM...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 eliminates the need for separate bearing sourcing and...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 PROX Connecting Rod 03.1105 comes fully assembled with...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 transfer cycle after cycle, whether you're pushing your...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 all necessary bearings and hardware, eliminating the need...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 for engines demanding high RPM capability and...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 arrives fully assembled with precision bearings and...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 guesswork and reduces installation time, letting you focus...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 assembly that eliminates the need to source bearings and...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 bearings and hardware separately, getting you back on...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 with precision tolerances and pre-assembled with quality...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 with precision-manufactured components, reducing...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 reliability with precision engineering, ensuring...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 Connecting Rod 03.1322 is engineered for reliability and...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 complete, ready-to-install assembly that eliminates the...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
