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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HOT RODS Connecting Rod 8666
HOT RODS
$245.95When you're pushing your engine to the limit, a connecting rod failure can end your season—or worse. The HOT RODS 8666 is engineered for sustained high-RPM performance with heavy-duty 8620 AISI steel construction and advanced bearing designs that...09230223- SKU:
- 09230223
- Availability:
- Ships Same Business Day
- Weight:
- 2.06 LBS
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- 8620 STEEL
- FEATURES:
- INCLUDES THRUST WASHERS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$245.95 -
HOT RODS Connecting Rod 8665
HOT RODS
$219.95If you're building a high-rpm engine or refreshing a tired block, connecting rods are the critical link between your crankshaft and pistons—and failure here means catastrophic engine damage. The HOT RODS 8665 Connecting Rod delivers the strength and...09230222- SKU:
- 09230222
- Availability:
- Ships Same Business Day
- Weight:
- 1.73 LBS
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$219.95 -
HOT RODS Connecting Rod 8664
HOT RODS
$219.95When you're pushing your engine to the limit, factory connecting rods become your weakest link. The HOT RODS 8664 is engineered for sustained high-RPM performance with certified 8620 AISI steel construction and precision bearing surfaces that won't...09230221- SKU:
- 09230221
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
$219.95 -
HOT RODS Connecting Rod 8622
HOT RODS
$232.95If you're building or rebuilding a high-performance engine, your connecting rods are critical load-bearing components that directly impact reliability at sustained high RPM. The HOT RODS 8622 is engineered for serious racing and performance applications...09230036- SKU:
- 09230036
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- HEAVY DUTY
- ENGINE TYPE:
- 4-CYCLE
- UNITS:
- KIT
$232.95 -
HOT RODS Connecting Rod 8617
HOT RODS
$225.95When you're building or rebuilding a high-output engine, your connecting rods are the critical link between combustion force and crankshaft rotation—they need to withstand extreme pressures and velocities without failure. The HOT RODS 8617 Connecting Rod...09230035- SKU:
- 09230035
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
$225.95 -
HOT RODS Crankshaft Kit CBK0223
HOT RODS
$835.95If you're building a high-displacement engine or need more bottom-end torque, a stroker crankshaft is one of the most effective upgrades available. The HOT RODS CBK0223 arrives factory-assembled, trued to OEM specifications, and ready to...09210602- SKU:
- 09210602
- Availability:
- Ships Same Business Day
- Weight:
- 13.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT
$835.95 -
HOT RODS Crankshaft Kit CBK0225
HOT RODS
$874.95If you're serious about maximizing displacement and low-end torque without a complete engine rebuild, a stroker crankshaft is one of the most cost-effective upgrades available. The HOT RODS CBK0225 arrives factory-assembled, trued to OEM specifications,...09210601- SKU:
- 09210601
- Availability:
- Ships Same Business Day
- Weight:
- 10.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT
$874.95 -
HOT RODS Crankshaft Kit CBK0222
HOT RODS
$741.95A stroker crankshaft assembly transforms your engine's displacement and low-end torque delivery without requiring a complete rebuild. The HOT RODS CBK0222 arrives factory-assembled and trued to OEM specifications, meaning you're getting a precision...09210597- SKU:
- 09210597
- Availability:
- Ships Same Business Day
- Weight:
- 9.90 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT
$741.95 -
HOT RODS Crankshaft Kit 4420
HOT RODS
$318.95If you're building a long-stroke engine for your ATV, a quality crankshaft assembly is non-negotiable—it's the foundation that translates fuel and air into reliable power. The HOT RODS Crankshaft Kit 4420 arrives factory-assembled, trued to OEM...09210518- SKU:
- 09210518
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 50 CC
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.98 MM
- UNITS:
- ASSEMBLY
$318.95 -
HOT RODS Crankshaft Kit 4419
HOT RODS
$343.95If you're running a long-stroke build on your ATV, the HOT RODS Crankshaft Kit 4419 eliminates guesswork and machine work by delivering a factory-assembled, trued crankshaft paired with proven connecting rods and bearings. This complete assembly meets or...09210517- SKU:
- 09210517
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 85 CC TO 100 CC
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- STROKE LENGTH METRIC:
- 45.80 MM
- TYPE:
- OEM STROKE
$343.95 -
HOT RODS Crankshaft Assembly 4415
HOT RODS
$436.95If you're building a high-performance ATV engine or planning a long-stroke conversion, a quality crankshaft assembly is non-negotiable—it's the foundation that translates power reliably to the track. The HOT RODS 4415 arrives factory-assembled, trued to...09210512- SKU:
- 09210512
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
- MODEL:
- 4-CYCLE
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 450 CC
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$436.95 -
HOT RODS Crankshaft Assembly 4401
HOT RODS
$383.95If you're looking to maximize displacement and power output in your ATV without extensive machine work, the HOT RODS Crankshaft Assembly 4401 delivers a complete long-stroke solution that's ready to bolt in. This factory-assembled unit comes pre-trued to...09210510- SKU:
- 09210510
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 50 CC
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- STROKE LENGTH METRIC:
- 39.96 MM
$383.95 -
HOT RODS Crankshaft Assembly 4084
HOT RODS
$543.95If you're building a high-performance ATV engine, a quality crankshaft assembly is non-negotiable—it's the foundation that transfers power reliably under extreme conditions. The HOT RODS 4084 arrives factory-assembled and pre-trued to OEM specifications,...09210509- SKU:
- 09210509
- Availability:
- Ships Same Business Day
- Weight:
- 9.83 LBS
- DISPLACEMENT:
- 450 CC
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$543.95 -
HOT RODS Crankshaft Assembly 4023
HOT RODS
$450.95If you're running a high-revving ATV engine and demand reliability without compromise, a properly assembled crankshaft is non-negotiable. The HOT RODS 4023 arrives factory-assembled and trued to OEM specifications, eliminating guesswork and saving you...09210508- SKU:
- 09210508
- Availability:
- Ships Same Business Day
- Weight:
- 4.75 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 48.90 MM
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 85 CC
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
$450.95 -
HOT RODS Crankshaft Kit CBK0190
HOT RODS
$476.95If you're serious about maximizing displacement and low-end torque, the HOT RODS Crankshaft Kit CBK0190 delivers the stroke geometry you need to build real power. Factory-assembled and pre-checked to OEM specifications, this complete crankshaft and...09210507- SKU:
- 09210507
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$476.95 -
HOT RODS Crankshaft - Stroker 4129
HOT RODS
$247.95A stroker crankshaft fundamentally transforms your ATV's engine by increasing displacement and low-end torque without requiring extensive machine work. Hot Rods' purpose-built stroker design eliminates the guesswork and fabrication costs associated with...09210460- SKU:
- 09210460
- Availability:
- Ships Same Business Day
- Weight:
- 7.00 LBS
- DISPLACEMENT:
- 262 CC
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 57,80 MM
- TYPE:
- STROKER
- MODEL:
- 4-CYCLE
- UNITS:
- ASSEMBLY
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 57.80 MM
$247.95Qty in Cart: 0Quantity:Price:$247.95Subtotal: -
HOT RODS Crankshaft 4019
HOT RODS
$556.95If you're serious about maximizing displacement and power in your ATV, a long-stroke crankshaft is one of the most effective upgrades available. The HOT RODS 4019 delivers factory-assembled reliability with the durability to handle aggressive riding and...09210457- SKU:
- 09210457
- Availability:
- Ships Same Business Day
- Weight:
- 9.81 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 4-CYCLE
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 450 CC
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
$556.95 -
HOT RODS Crankshaft Kit CBK0127
HOT RODS
$795.95If you're building a high-performance engine or restoring a classic with modern reliability, the HOT RODS Crankshaft Kit CBK0127 delivers factory-true specifications with components engineered to meet or exceed OEM performance standards. This complete...09210361- SKU:
- 09210361
- Availability:
- Ships Same Business Day
- Weight:
- 9.90 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$795.95Qty in Cart: 0Quantity:Price:$795.95Subtotal: -
HOT RODS Crankshaft Kit CBK0126
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic, the HOT RODS Crankshaft Kit CBK0126 delivers the reliability of OEM specifications with the durability to handle sustained power increases. This factory-assembled complete crankshaft...09210360- SKU:
- 09210360
- Availability:
- Ships Same Business Day
- Weight:
- 10.49 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$595.95 -
HOT RODS Crankshaft Kit CBK0117
HOT RODS
$874.95If you're building a high-performance engine or restoring a stroker application, the HOT RODS Crankshaft Kit CBK0117 delivers the precision and durability you need to handle serious power. Factory-assembled and engineered to meet or exceed OEM...09210354- SKU:
- 09210354
- Availability:
- Ships Same Business Day
- Weight:
- 10.21 LBS
- TYPE:
- OEM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
$874.95
