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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PROX Crank Bearing and Seal Kit 23.CBS63004
PROX
$133.95A crankshaft bearing and seal failure can leave you stranded or worse—damage your entire engine. The PROX Crank Bearing and Seal Kit 23.CBS63004 gives you a complete, factory-spec replacement solution that restores your crank's reliability and...09240365- SKU:
- 09240365
- Availability:
- Ships Same Business Day
- Weight:
- 1.33 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- STYLE:
- 2-STROKE
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$133.95 -
PROX Connecting Rod Kit - KTM 125/150 SX 03.6226
PROX
$132.95A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The PROX Connecting Rod Kit for KTM 125/150 SX delivers OEM-equivalent reliability with precision-engineered components that handle the demands of...09230471- SKU:
- 09230471
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- FORGED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
$132.95 -
PROX Connecting Rod Kit - Kawasaki KX 250 F 03.4347
PROX
$236.95A connecting rod failure mid-race isn't just costly—it's catastrophic. The PROX Connecting Rod Kit for Kawasaki KX 250 F delivers the precision engineering and durability needed to withstand the extreme forces of high-RPM riding, whether you're pushing...09230461- SKU:
- 09230461
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED
$236.95 -
PROX Connecting Rod Kit - Honda CRF250R 03.1348
PROX
$173.95A connecting rod failure mid-race costs you the event—and potentially your engine. The PROX Connecting Rod Kit for your CRF250R delivers OEM-spec durability with precision manufacturing that handles sustained high RPM and aggressive riding conditions...09230561- SKU:
- 09230561
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
$173.95 -
PROX Connecting Rod Kit - KTM 85 SX/Husqvarna TC 85 03.6113
PROX
$110.95A connecting rod kit is critical for high-rpm reliability in two-stroke engines, where combustion forces demand precision-engineered components that can handle extreme load cycling. The PROX Connecting Rod Kit for KTM 85 SX and Husqvarna TC 85 replaces...09230331- SKU:
- 09230331
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$110.95 -
PROX Connecting Rod 03.6029
PROX
$118.95A connecting rod is the critical link between your piston and crankshaft—any weakness here translates directly to lost power and reliability. The PROX 03.6029 arrives fully assembled with precision bearings and hardware, eliminating the guesswork and...09230277- SKU:
- 09230277
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- FORGED STEEL
$118.95 -
PROX Connecting Rod Kit 03.6340
PROX
$165.95A quality connecting rod is fundamental to engine reliability and power delivery—it's the critical link between your crankshaft and piston, transmitting combustion forces under extreme stress. The PROX Connecting Rod Kit 03.6340 arrives complete and...09230282- SKU:
- 09230282
- Availability:
- Ships Same Business Day
- Weight:
- 1.22 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
$165.95 -
PROX Connecting Rod Kit 03.1405
PROX
$183.95A connecting rod is the critical link between your piston and crankshaft—any flex, wear, or misalignment will rob you of power and reliability. The PROX Connecting Rod Kit 03.1405 delivers precision-engineered components with the bearing surfaces and...09230239- SKU:
- 09230239
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- FORGED STEEL
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
$183.95 -
PROX Connecting Rod Kit 03.6428
PROX
$188.95A connecting rod is the critical link between your crankshaft and piston—any wear, flex, or imbalance directly compromises engine efficiency and reliability. The PROX 03.6428 Kit delivers a complete, ready-to-install assembly with precision-engineered...09230246- SKU:
- 09230246
- Availability:
- Ships Same Business Day
- Weight:
- 1.77 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FORGED STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$188.95 -
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 03.4309
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 03.3219
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
