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 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 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 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 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 -
HOT RODS Crankshaft Kit CBK0111
HOT RODS
$569.95If you're building a high-performance engine or need a direct replacement for a worn crankshaft, the HOT RODS CBK0111 delivers factory-matched specifications with the durability to handle increased boost and cylinder pressure. This complete assembly...09210352- SKU:
- 09210352
- Availability:
- Ships Same Business Day
- Weight:
- 8.30 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$569.95 -
HOT RODS Crankshaft Kit CBK0110
HOT RODS
$768.95If you're building a high-performance engine or restoring a race-proven platform, the HOT RODS Crankshaft Kit CBK0110 delivers factory-matched precision with performance credentials that rival or exceed OEM specifications. This complete assembly arrives...09210351- SKU:
- 09210351
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$768.95 -
HOT RODS Crankshaft Kit CBK0107
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic with serious power ambitions, the HOT RODS Crankshaft Kit CBK0107 gives you factory-spec reliability paired with upgraded durability for demanding applications. This complete assembly...09210348- SKU:
- 09210348
- Availability:
- Ships Same Business Day
- Weight:
- 6.84 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$595.95 -
HOT RODS Crankshaft Kit CBK0104
HOT RODS
$264.95A stroker crankshaft fundamentally increases your engine's displacement and torque output, delivering the low-end power and sustained performance necessary for competitive racing or high-demand builds. The HOT RODS CBK0104 arrives factory-assembled and...09210346- SKU:
- 09210346
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OEM
$264.95 -
HOT RODS Crankshaft Kit CBK0103
HOT RODS
$476.95If you're building a high-performance engine or need to replace a worn crankshaft, the HOT RODS Crankshaft Kit CBK0103 delivers factory-matched reliability with the durability to handle sustained power. This complete assembly arrives pre-assembled and...09210345- SKU:
- 09210345
- Availability:
- Ships Same Business Day
- Weight:
- 6.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$476.95 -
HOT RODS Crankshaft Kit CBK0076
HOT RODS
$343.95If you're building a high-performance engine or planning a stroker kit upgrade, the HOT RODS Crankshaft Kit CBK0076 delivers the durability and precision you need to handle sustained power increases. Factory-assembled and true to OEM specifications, this...09210324- SKU:
- 09210324
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$343.95 -
HOT RODS Crankshaft Kit CBK0075
HOT RODS
$397.95If you're building a high-performance engine or restoring a classic that demands more displacement and power, the HOT RODS Crankshaft Kit CBK0075 delivers the precision engineering and durability you need. This factory-assembled stroker crankshaft is...09210323- SKU:
- 09210323
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$397.95 -
HOT RODS Crankshaft Kit CBK0031
HOT RODS
$662.95The HOT RODS Crankshaft Kit CBK0031 delivers factory-spec performance with the durability to handle high-RPM demands and forced-induction applications. This complete assembly arrives pre-assembled and true to OEM specifications, eliminating guesswork and...09210287- SKU:
- 09210287
- Availability:
- Ships Same Business Day
- Weight:
- 10.17 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$662.95 -
HOT RODS Crankshaft Kit CBK0029
HOT RODS
$423.95Whether you're building a high-displacement stroker engine or replacing a worn crankshaft, the HOT RODS Crankshaft Kit CBK0029 delivers the durability and precision you need for sustained high-RPM performance. This factory-assembled unit meets or exceeds...09210286- SKU:
- 09210286
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$423.95 -
HOT RODS Crankshaft Kit CBK0026
HOT RODS
$716.95If you're building a high-performance engine or need to restore your crankshaft assembly to factory specifications, the HOT RODS Crankshaft Kit CBK0026 delivers the reliability and precision you demand. This complete assembly arrives factory-assembled...09210284- SKU:
- 09210284
- Availability:
- Ships Same Business Day
- Weight:
- 11.96 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$716.95 -
HOT RODS Crankshaft Kit CBK0024
HOT RODS
$531.95If you're serious about building an engine that rivals or exceeds OEM performance standards, the HOT RODS Crankshaft Kit CBK0024 delivers factory-assembled reliability without factory limitations. This complete crankshaft assembly arrives ready for...09210282- SKU:
- 09210282
- Availability:
- Ships Same Business Day
- Weight:
- 12.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$531.95 -
HOT RODS Crankshaft Kit CBK0022
HOT RODS
$423.95If you're building a high-performance engine or need a reliable replacement crankshaft assembly, the HOT RODS Crankshaft Kit CBK0022 delivers factory-spec precision with proven durability. This complete assembly arrives ready to install, eliminating the...09210280- SKU:
- 09210280
- Availability:
- Ships Same Business Day
- Weight:
- 8.18 LBS
- TYPE:
- OEM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
$423.95
