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 Bottom End Kit CBK0205
HOT RODS
$716.95A complete bottom-end rebuild requires precision-matched components and quality seals to ensure longevity and reliable power delivery. The HOT RODS Bottom End Kit CBK0205 consolidates everything you need for crankshaft installation in one package,...09210576- SKU:
- 09210576
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- MODEL:
- 4-CYCLE
- UNITS:
- KIT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- STANDARD
- TYPE:
- OE REPLACEMENT
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- BOTTOM END KIT
- RIDING STYLE:
- OFF-ROAD
$716.95 -
HOT RODS Crankshaft Kit CBK0091
HOT RODS
$476.95If you're building a high-performance engine or refreshing a tired bottom end, the HOT RODS Crankshaft Kit CBK0091 delivers factory-matched reliability with measurable performance gains. This complete assembly arrives pre-assembled and true to OEM...09210336- SKU:
- 09210336
- Availability:
- Ships Same Business Day
- Weight:
- 8.25 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OEM
$476.95 -
HOT RODS Crankshaft Kit CBK0092
HOT RODS
$502.95If you're building a high-performance engine or refreshing a tired bottom end, the HOT RODS Crankshaft Kit CBK0092 gives you a factory-assembled solution that meets or exceeds OEM specifications right out of the box. This complete assembly eliminates the...09210337- SKU:
- 09210337
- Availability:
- Ships Same Business Day
- Weight:
- 11.95 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$502.95 -
HOT RODS Crankshaft Kit CBK0093
HOT RODS
$689.95If you're building a high-performance engine or looking to increase displacement without a complete engine swap, the HOT RODS Crankshaft Kit CBK0093 delivers the geometry and durability you need. This factory-assembled crankshaft arrives true to OEM...09210338- SKU:
- 09210338
- Availability:
- Ships Same Business Day
- Weight:
- 12.85 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$689.95Qty in Cart: 0Quantity:Price:$689.95Subtotal: -
HOT RODS Crankshaft Kit CBK0094
HOT RODS
$716.95If you're pushing your engine beyond factory limits, the HOT RODS Crankshaft Kit CBK0094 delivers the stroke and durability required for serious performance builds. Factory-assembled and true to OEM specifications, this complete crankshaft assembly...09210339- SKU:
- 09210339
- Availability:
- Ships Same Business Day
- Weight:
- 12.55 LBS
- TYPE:
- OEM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
$716.95 -
HOT RODS Crankshaft Kit CBK0095
HOT RODS
$874.95If you're building a high-performance engine or restoring a machine that demands reliability under extreme conditions, the HOT RODS Crankshaft Kit CBK0095 delivers factory-matched precision without compromise. This complete assembly arrives...09210340- SKU:
- 09210340
- Availability:
- Ships Same Business Day
- Weight:
- 13.35 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$874.95 -
HOT RODS Crankshaft Kit CBK0099
HOT RODS
$741.95If you're building or rebuilding a high-performance engine, the quality of your crankshaft assembly directly impacts reliability, durability, and power delivery. The HOT RODS Crankshaft Kit CBK0099 is factory-assembled and true to OEM specifications,...09210341- SKU:
- 09210341
- Availability:
- Ships Same Business Day
- Weight:
- 9.90 LBS
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
$741.95 -
HOT RODS Crankshaft Kit CBK0100
HOT RODS
$423.95If you're building a high-performance engine, your crankshaft is the foundation—and the HOT RODS CBK0100 delivers the reliability and precision you need to maximize power and durability. Factory-assembled and true to OEM specifications, this complete...09210342- SKU:
- 09210342
- Availability:
- Ships Same Business Day
- Weight:
- 6.30 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$423.95 -
HOT RODS Crankshaft Kit CBK0101
HOT RODS
$423.95If you're building a high-performance engine or restoring a classic with serious power goals, a quality crankshaft assembly is non-negotiable. The HOT RODS Crankshaft Kit CBK0101 arrives factory-assembled and true to OEM specifications, eliminating...09210343- SKU:
- 09210343
- Availability:
- Ships Same Business Day
- Weight:
- 6.60 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM
- UNITS:
- KIT
$423.95Qty in Cart: 0Quantity:Price:$423.95Subtotal: -
HOT RODS Crankshaft Kit CBK0102
HOT RODS
$397.95If you're building a high-performance engine or restoring a classic with modern reliability in mind, the HOT RODS Crankshaft Kit CBK0102 delivers factory-spec precision with measurable performance gains over stock. This complete assembly arrives ready...09210344- SKU:
- 09210344
- Availability:
- Ships Same Business Day
- Weight:
- 6.65 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$397.95 -
HOT RODS Crankshaft 4075
HOT RODS
$331.95If you're serious about extracting maximum performance from your ATV's engine, a purpose-built crankshaft assembly is non-negotiable. The HOT RODS Crankshaft 4075 arrives factory-assembled and trued to OEM specifications, eliminating guesswork and...09210127- SKU:
- 09210127
- Availability:
- Ships Same Business Day
- Weight:
- 5.25 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 150 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 43.80 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
$331.95 -
HOT RODS Crankshaft 4083
HOT RODS
$436.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft 4083 delivers the bottom-end durability and performance you need without the typical machine work headaches. This complete assembly arrives factory-assembled and trued to OEM...09210128- SKU:
- 09210128
- Availability:
- Ships Same Business Day
- Weight:
- 7.17 LBS
- STROKE LENGTH METRIC:
- 52.20 MM
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
$436.95 -
Hot Cams Cam Chain for KTM 350 EXC-F 2012-2016 HC98XRH2015112
HOT CAMS
$110.95A worn or failing cam chain compromises valve timing and engine reliability—especially critical on high-revving four-stroke dirt bikes. The Hot Cams HC98XRH2015112 is engineered to exceed OEM specifications, delivering the durability and silent operation...09250823- SKU:
- 09250823
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BASE FINISH:
- RAW
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MODEL:
- SILENT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- CHAIN SIZE:
- 98XRH2015
- COLOR/FINISH:
- RAW
- PRODUCT NAME:
- CHAIN
- UNITS:
- EACH
$110.95 -
Hot Cams Cam Chain for Yamaha TT 600 1983-1986 HC82RH2015126
HOT CAMS
$55.95A worn or stretched cam chain compromises valve timing precision and engine reliability—especially critical in high-revving applications where milliseconds matter. The HOT CAMS HC82RH2015126 delivers heat-treated construction that resists wear and...09250860- SKU:
- 09250860
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- CHAIN SIZE:
- 82RH2015
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- CHAIN
- BASE FINISH:
- RAW
- RIDING STYLE:
- STREET
- TYPE:
- CAM
- MODEL:
- SILENT
$55.95 -
Hot Cams Cam Chain Yamaha YFZ450R 2009-2018 HC98XRH2010120
HOT CAMS
$46.95A worn or stock cam chain will rob your YFZ450R of reliability under sustained high RPM running, causing timing slippage and potential valve damage. The HOT CAMS HC98XRH2010120 delivers heat-treated links that exceed OEM durability specs, giving you the...09250864- SKU:
- 09250864
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BASE FINISH:
- RAW
- MATERIAL:
- STEEL
- MODEL:
- SILENT
- TYPE:
- CAM
- CHAIN SIZE:
- 98XRH2010
- RIDING STYLE:
- ATV
- COLOR/FINISH:
- RAW
- PRODUCT NAME:
- CHAIN
- UNITS:
- EACH
$46.95 -
Hot Cams Camshaft for Honda CRF250R 2010-2015 1264-1
HOT CAMS
$362.95The stock camshaft in your CRF250R limits what your engine can truly deliver—leaving power on the table across the RPM range. Hot Cams' 1264-1 camshaft unlocks that potential with precision-engineered valve timing and lift profiles designed specifically...09250865- SKU:
- 09250865
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 266°
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ITR DESIGN
- APPLICATION:
- INTAKE
- EXHAUST LIFT METRIC:
- 8.84 MM
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 241°
- INTAKE LIFT METRIC:
- 8.26 MM
- PRODUCT NAME:
- CAMSHAFT
$362.95Qty in Cart: 0Quantity:Price:$362.95Subtotal: -
Hot Cams Stage 1 Intake Camshaft for 2011-2016 Kawasaki KX250F 2218-1IN
HOT CAMS
$294.95The stock camshaft in your KX250F limits what your engine can actually deliver. The Hot Cams Stage 1 Intake Camshaft unlocks measurable gains in mid-range torque and throttle response without requiring valve spring upgrades or custom fabrication. If...09250661- SKU:
- 09250661
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- INTAKE DURATION IMPERIAL:
- 237°
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- APPLICATION:
- INTAKE
- INTAKE LIFT METRIC:
- 9.14 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$294.95 -
Hot Cams Stage 1 Intake Camshaft for Kawasaki KX450F 2009-2015 2185-1IN
HOT CAMS
$294.95If you're running a KX450F on the track, your camshaft profile directly controls how power is delivered across the RPM band. The Hot Cams Stage 1 intake camshaft gives you measurable mid-range torque gains without requiring valve spring replacement—a...09250553- SKU:
- 09250553
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- INTAKE DURATION IMPERIAL:
- 234°
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- INTAKE LIFT METRIC:
- 9.14 MM
$294.95 -
Hot Cams Exhaust Camshaft for Kawasaki KX450F 2009-2015 2186-1E
HOT CAMS
$289.95The HOT CAMS Exhaust Camshaft 2186-1E is engineered to maximize power delivery and throttle response across your KX450F's entire RPM range, giving you the edge in competitive racing environments. Whether you're chasing peak horsepower or building a...09250554- SKU:
- 09250554
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- EXHAUST DURATION IMPERIAL:
- 240°
- EXHAUST LIFT METRIC:
- 8.38 MM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$289.95 -
Hot Cams Stage 2 Intake Camshaft for 2006-2018 Kawasaki KX450F 2187-2IN
HOT CAMS
$294.95If you're serious about extracting every bit of performance from your KX450F, the HOT CAMS Stage 2 Intake Camshaft is a direct path to measurable gains in horsepower and throttle response. This drop-in upgrade requires zero valve spring modifications,...09250555- SKU:
- 09250555
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- INTAKE DURATION IMPERIAL:
- 250°
- INTAKE LIFT METRIC:
- 9.91 MM
- TYPE:
- CAM
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
$294.95
