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 03.3122
PROX
$109.95A connecting rod is the critical link between your crankshaft and piston—it transmits combustion forces while enduring extreme stress at high RPM. The PROX 03.3122 arrives as a complete assembly with all bearings and hardware pre-installed, eliminating...09230149- SKU:
- 09230149
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
PROX Connecting Rod 03.2423
PROX
$175.95A quality connecting rod is the critical link between your crankshaft and piston—it must transmit enormous combustion forces with precision while maintaining reliable clearances under extreme RPM and load. The PROX 03.2423 is engineered to handle...09230150- SKU:
- 09230150
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- FORGED STEEL
$175.95Qty in Cart: 0Quantity:Price:$175.95Subtotal: -
PROX Connecting Rod 03.3405
PROX
$183.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly translates to lost power, reliability issues, or catastrophic failure under load. The PROX 03.3405 is a complete, ready-to-install assembly that...09230152- SKU:
- 09230152
- Availability:
- Ships Same Business Day
- Weight:
- 1.58 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$183.95Qty in Cart: 0Quantity:Price:$183.95Subtotal: -
PROX Connecting Rod 03.2400
PROX
$173.95A connecting rod is the critical link between your piston and crankshaft—if it fails, your engine fails. The PROX 03.2400 is engineered to handle the brutal reciprocating forces of high-RPM operation with precision-manufactured components that maintain...09230153- SKU:
- 09230153
- Availability:
- Ships Same Business Day
- Weight:
- 1.54 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- STREET
$173.95 -
PROX Connecting Rod 03.6217
PROX
$125.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly compromises power delivery and engine reliability. The PROX 03.6217 arrives fully assembled with precision bearings and hardware, eliminating the...09230154- SKU:
- 09230154
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- EACH
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$125.95 -
PROX Connecting Rod 03.4218
PROX
$132.95A quality connecting rod is critical to engine reliability and power delivery—it directly transfers combustion force from the piston to the crankshaft, so any weakness here compromises your entire build. The PROX 03.4218 is a complete, ready-to-install...09230155- SKU:
- 09230155
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$132.95 -
PROX Connecting Rod 03.6326
PROX
$173.95A connecting rod is the critical link between your piston and crankshaft—it must endure enormous forces at high RPM while maintaining precise tolerances. The PROX 03.6326 comes fully assembled with premium bearings and hardware, eliminating the guesswork...09230156- SKU:
- 09230156
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$173.95 -
PROX Connecting Rod 03.3207
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—it must withstand extreme forces, precise tolerances, and thousands of combustion cycles without failure. The PROX Connecting Rod 03.3207 arrives as a complete assembly with all...09230157- SKU:
- 09230157
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
$132.95 -
PROX Connecting Rod 03.4334
PROX
$173.95A connecting rod is the critical link between your piston and crankshaft—its durability directly impacts engine reliability and power delivery under load. The PROX 03.4334 arrives fully assembled with precision bearings and hardware, eliminating...09230158- SKU:
- 09230158
- Availability:
- Ships Same Business Day
- Weight:
- 1.14 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
$173.95 -
PROX Connecting Rod 03.6320
PROX
$132.95A connecting rod failure can end your race day—or worse, damage your entire engine. The PROX Connecting Rod 03.6320 delivers the strength and precision needed to reliably transfer combustion force from piston to crankshaft, whether you're running stock...09230159- SKU:
- 09230159
- Availability:
- Ships Same Business Day
- Weight:
- 0.99 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$132.95 -
PROX Connecting Rod 03.2225
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft, directly influencing engine responsiveness and reliability under load. The PROX 03.2225 delivers precision engineering with complete bearing assemblies included, eliminating the...09230160- SKU:
- 09230160
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.3316
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—if it fails, your engine fails. The PROX 03.3316 delivers OEM-quality construction with complete assembly, eliminating weak points and the hassle of sourcing individual components...09230162- SKU:
- 09230162
- Availability:
- Ships Same Business Day
- Weight:
- 1.07 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.1406
PROX
$137.95A quality connecting rod is the critical link between your crankshaft and piston—it must handle extreme forces while maintaining precise tolerances, or your engine fails catastrophically. The PROX Connecting Rod 03.1406 delivers the durability and...09230163- SKU:
- 09230163
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$137.95 -
PROX Connecting Rod 03.2401
PROX
$165.95A connecting rod is the critical link between your piston and crankshaft—any weakness here translates directly to power loss and reliability issues. The PROX Connecting Rod 03.2401 is engineered for high-rpm applications where precision and durability...09230165- SKU:
- 09230165
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- MATERIAL:
- FORGED STEEL
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$165.95 -
PROX Connecting Rod 03.4223
PROX
$119.95A connecting rod is the critical link between your piston and crankshaft—it must handle extreme loads and precise tolerances or your engine fails. The PROX Connecting Rod 03.4223 arrives complete and ready to install, eliminating the need to source...09230169- SKU:
- 09230169
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
PROX Connecting Rod 03.6248
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—it must handle extreme combustion pressures and rotational forces without flex or failure. The PROX 03.6248 delivers the precision engineering and complete assembly you need to...09230171- SKU:
- 09230171
- Availability:
- Ships Same Business Day
- Weight:
- 0.83 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- FORGED STEEL
$132.95 -
PROX Connecting Rod 03.4214
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft, transmitting combustion forces while managing extreme stress cycles. The PROX 03.4214 comes fully assembled with precision bearings and hardware, eliminating the guesswork and...09230172- SKU:
- 09230172
- 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 03.3224
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—it must handle extreme forces and precise tolerances to deliver reliable power delivery and engine longevity. The PROX Connecting Rod 03.3224 arrives complete with all necessary...09230174- SKU:
- 09230174
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- EACH
$132.95 -
PROX Connecting Rod 03.1661
PROX
$199.95A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The PROX 03.1661 delivers OEM-quality construction with complete bearing assemblies pre-installed, eliminating guesswork during rebuild and getting...09230176- SKU:
- 09230176
- Availability:
- Ships Same Business Day
- Weight:
- 2.48 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- INCLUDES THRUST WASHERS
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
PROX Connecting Rod 03.3211
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly compromises power delivery and engine reliability. The PROX 03.3211 is a complete, ready-to-install assembly that eliminates the guesswork of sourcing...09230178- SKU:
- 09230178
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- EACH
$132.95
