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
-
HOT RODS Crank Bearings K052
HOT RODS
$93.95A crankshaft is only as reliable as its bearing support system. The HOT RODS K052 crank bearing kit ensures precision fitment and optimal load distribution across your engine's most critical rotating assembly, eliminating premature wear and catastrophic...09240167- SKU:
- 09240167
- Availability:
- Ships Same Business Day
- Weight:
- 1.03 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$93.95 -
HOT RODS Crank Bearings K044
HOT RODS
$105.95A quality crankshaft assembly demands equally reliable main bearings and seals to ensure proper load distribution, minimize friction, and maintain critical oil pressure throughout your engine's operating range. HOT RODS K044 crank bearings are engineered...09240168- SKU:
- 09240168
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$105.95 -
HOT RODS Crank Bearings K045
HOT RODS
$78.95A crankshaft is only as reliable as its bearings. The HOT RODS Crank Bearings K045 deliver precision tolerances and superior load-carrying capacity, ensuring your crank stays centered and your engine maintains consistent performance under high RPM stress...09240169- SKU:
- 09240169
- Availability:
- Ships Same Business Day
- Weight:
- 0.89 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BALL
$78.95 -
HOT RODS Crank Bearings K041
HOT RODS
$83.95A crankshaft is only as reliable as its bearings. The HOT RODS K041 crank bearing and seal kit delivers the precision tolerances and material quality needed to handle sustained high-RPM loads without premature wear or failure. Whether you're rebuilding a...09240116- SKU:
- 09240116
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$83.95 -
HOT RODS Crank Bearings K048
HOT RODS
$118.95A quality crankshaft is only as reliable as the bearings supporting it. The HOT RODS Crank Bearings K048 are precision-engineered main bearing and seal kits designed to work seamlessly with HOT RODS crankshaft assemblies, ensuring proper load...09240119- SKU:
- 09240119
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$118.95 -
HOT RODS Crank Bearings K058
HOT RODS
$116.95A crankshaft is only as reliable as its bearing package. The HOT RODS K058 crank bearings deliver precision-engineered main bearing and seal kits that ensure proper load distribution, reduce friction, and extend engine longevity—critical when you're...09240126- SKU:
- 09240126
- Availability:
- Ships Same Business Day
- Weight:
- 1.62 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- UNITS:
- SET
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
$116.95Qty in Cart: 0Quantity:Price:$116.95Subtotal: -
HOT RODS Crank Bearings K093
HOT RODS
$159.95A quality crankshaft seal kit is non-negotiable when installing a HOT RODS crankshaft assembly—it's your first line of defense against oil leakage and contamination. The K093 Seal Kit ensures a proper, leak-free installation by providing OEM-spec seals...09240402- SKU:
- 09240402
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$159.95 -
HOT RODS Crank Bearings K089
HOT RODS
$81.95A quality crankshaft seal kit is essential insurance against oil leakage and contamination that can compromise engine reliability and performance. The HOT RODS K089 Crank Bearings Seal Kit ensures proper fluid containment during and after crankshaft...09240403- SKU:
- 09240403
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- PRODUCT NAME:
- BEARING SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$81.95 -
HOT RODS Crankshaft - Stroker 4199
HOT RODS
$202.95A stroker crankshaft is one of the most effective ways to increase displacement and unlock additional torque and horsepower in your ATV engine. The HOT RODS Stroker 4199 pairs a longer stroke with precision-engineered pistons to deliver measurable...09210220- SKU:
- 09210220
- Availability:
- Ships Same Business Day
- Weight:
- 9.30 LBS
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- MODEL:
- 4-CYCLE
- STROKE LENGTH:
- 56,60 MM
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 263 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 56.60 MM
- TYPE:
- STROKER
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$202.95Qty in Cart: 0Quantity:Price:$202.95Subtotal: -
HOT RODS Crankshaft Kit 4427
HOT RODS
$556.95Whether you're building a high-displacement engine or replacing a worn OEM crankshaft, the HOT RODS Crankshaft Kit 4427 delivers factory-matched precision without the factory limitations. This complete assembly arrives pre-assembled and true to OEM...09210783- SKU:
- 09210783
- Availability:
- Ships Same Business Day
- Weight:
- 7.05 LBS
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- OEM STROKE
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- 4-CYCLE
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- ASSEMBLY
$556.95 -
HOT RODS Crankshaft Kit 4428
HOT RODS
$515.95If you're building a high-performance engine or pushing your existing setup beyond stock limits, the HOT RODS Crankshaft Kit 4428 delivers the reliability and durability you need to survive sustained boost and rpm. Factory-assembled and validated to OEM...09210784- SKU:
- 09210784
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 4-CYCLE
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- 4140 STEEL
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- STEEL
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
$515.95 -
HOT RODS Bottom End Kit CBK0202
HOT RODS
$531.95A complete bottom-end rebuild demands precision parts and a seamless installation process—this kit eliminates the guesswork by bundling everything you need in one package. Whether you're stroking an engine or performing a standard crankshaft...09210536- SKU:
- 09210536
- Availability:
- Ships Same Business Day
- Weight:
- 4.65 LBS
- MODEL:
- 2-CYCLE
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- STANDARD
- PRODUCT NAME:
- BOTTOM END KIT
- UNITS:
- KIT
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OE REPLACEMENT
$531.95 -
HOT RODS Bottom End Kit CBK0203
HOT RODS
$476.95A complete crankshaft installation demands precision components and comprehensive gasket coverage—this kit eliminates the guesswork by bundling everything you need in one package. Whether you're running a stroker assembly or standard bottom end, having...09210537- SKU:
- 09210537
- Availability:
- Ships Same Business Day
- Weight:
- 7.10 LBS
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- UNITS:
- KIT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- STANDARD
- TYPE:
- OE REPLACEMENT
- PRODUCT NAME:
- BOTTOM END KIT
- RIDING STYLE:
- OFF-ROAD
$476.95 -
HOT RODS Crankshaft Kit CBK0010
HOT RODS
$716.95If you're building a high-performance engine or restoring a machine that demands reliability and power, the HOT RODS Crankshaft Kit CBK0010 delivers factory-matched precision with the durability to handle sustained abuse. This complete assembly arrives...09210269- SKU:
- 09210269
- Availability:
- Ships Same Business Day
- Weight:
- 13.30 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$716.95 -
HOT RODS Crankshaft Kit CBK0011
HOT RODS
$716.95If you're building a high-performance engine or pushing your existing platform beyond factory limits, the HOT RODS Crankshaft Kit CBK0011 delivers the reliability and precision you need. This factory-assembled crankshaft meets or exceeds OEM...09210270- SKU:
- 09210270
- Availability:
- Ships Same Business Day
- Weight:
- 13.05 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM
$716.95 -
HOT RODS Crankshaft Kit CBK0012
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic with modern reliability in mind, the HOT RODS Crankshaft Kit CBK0012 delivers factory-matched precision with the durability to handle aggressive tuning. This complete assembly arrives...09210271- SKU:
- 09210271
- Availability:
- Ships Same Business Day
- Weight:
- 14.62 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$595.95 -
HOT RODS Crankshaft Kit CBK0040
HOT RODS
$569.95If you're building a high-performance engine or restoring a classic, the HOT RODS Crankshaft Kit CBK0040 delivers the reliability and precision you need without compromise. Factory-assembled and true to OEM specifications, this complete crankshaft...09210292- SKU:
- 09210292
- Availability:
- Ships Same Business Day
- Weight:
- 12.23 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$569.95 -
HOT RODS Crankshaft Kit CBK0045
HOT RODS
$278.95If you're building a high-performance engine or restoring a classic with modern reliability in mind, the HOT RODS Crankshaft Kit CBK0045 delivers factory-matched precision without the factory limitations. This complete assembly arrives ready to...09210293- SKU:
- 09210293
- Availability:
- Ships Same Business Day
- Weight:
- 7.00 LBS
- TYPE:
- OEM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
$278.95 -
HOT RODS Crankshaft Kit CBK0047
HOT RODS
$305.95If you're building a high-performance engine or restoring a classic with serious power goals, the HOT RODS Crankshaft Kit CBK0047 delivers the reliability and performance of a factory-spec component without compromise. This complete assembly arrives...09210295- SKU:
- 09210295
- Availability:
- Ships Same Business Day
- Weight:
- 6.95 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$305.95 -
HOT RODS Crankshaft Kit CBK0048
HOT RODS
$397.95If you're building a high-performance engine or need to restore a worn crankshaft assembly, the HOT RODS Crankshaft Kit CBK0048 delivers the reliability and precision you expect from a factory-assembled component. This complete kit arrives ready for...09210296- SKU:
- 09210296
- Availability:
- Ships Same Business Day
- Weight:
- 6.30 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OEM
$397.95
