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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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WINDEROSA Oil Seal - WaveRunner 622117
WINDEROSA
$26.53Oil seals are critical to engine longevity—they prevent fluid leakage that compromises bearing lubrication and engine performance. The WINDEROSA Oil Seal (622117) is engineered to maintain a tight barrier in your WaveRunner, protecting against coolant...09351110- SKU:
- 09351110
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$26.53 -
WORKS CONNECTION Aluminum Oil Filler Plug - Red 24-001
WORKS CONNECTION
$32.95Stock plastic oil filler plugs are prone to cracking, stripping, and leaking—especially under high RPM or extreme engine temperatures. The WORKS CONNECTION aluminum oil filler plug eliminates these failure points with a precision-machined component that...09500056- SKU:
- 09500056
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE FINISH:
- ANODIZED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
- BASE COLOR:
- RED
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$32.95 -
WORKS CONNECTION Oil Fill Plug - Green 24-198
WORKS CONNECTION
$32.95Stock plastic oil fill plugs are prone to cracking under thermal stress and vibration—especially in high-performance or track applications. The WORKS CONNECTION Oil Fill Plug replaces that weak point with a precision-machined aluminum component that...09500608- SKU:
- 09500608
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- BASE COLOR:
- GREEN
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- GREEN
- MATERIAL:
- 6061 T-6 ALUMINUM
- PRODUCT NAME:
- PLUG
- TYPE:
- OIL FILLER
- RIDING STYLE:
- ATV
$32.95 -
WSM Piston Kit - K1100 - +.25 mm 010-821-04PK
WSM
$98.28High-performance pistons are the foundation of reliable power delivery under sustained boost and RPM, and OEM units often compromise on thermal management and durability. The WSM K1100 Piston Kit delivers OEM-equivalent construction with purposeful...01082104P- SKU:
- 01082104P
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$98.28 -
BOYESEN Ignition Cover - Black - KTM SX SC-41AB
BOYESEN
$87.95The factory appearance of a professional-grade ignition cover matters when you're serious about your machine. This Boyesen cover seals properly to keep dirt and water out of your engine's internals—protecting your investment and maintaining reliability...09401266- SKU:
- 09401266
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- MATERIAL:
- ALUMINUM
- MODEL:
- FACTORY RACING
- COLOR/FINISH:
- POWDER-COATED
- UNITS:
- EACH
$87.95 -
HOT RODS Crankshaft Assembly 4014
HOT RODS
$305.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft Assembly 4014 delivers the durability and precision you need without the machine work. This complete, factory-assembled unit meets or exceeds OEM specifications, saving you...H117- SKU:
- H117
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
$305.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0006
HOT RODS
$34.95A leaking or failing water pump can quickly escalate into catastrophic engine damage, making timely repairs critical for both track and street applications. This HOT RODS repair kit supplies all internal components needed to restore OEM-level cooling...09342918- SKU:
- 09342918
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0008
HOT RODS
$54.95A leaking or failing water pump can quickly escalate from a minor inconvenience to catastrophic engine damage, especially under racing conditions or sustained high-performance driving. This repair kit delivers OEM-equivalent components—precision...09342920- SKU:
- 09342920
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$54.95 -
HOT RODS Crankshaft Assembly 4032
HOT RODS
$476.95If you're building a high-performance ATV engine or refreshing a tired bottom end, the HOT RODS Crankshaft Assembly 4032 delivers factory-proven reliability without the machine work. This complete, pre-trued assembly arrives ready to install, eliminating...H121- SKU:
- H121
- Availability:
- Ships Same Business Day
- Weight:
- 6.56 LBS
- COLOR/FINISH:
- STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$476.95 -
HOT RODS Crankshaft 4095
HOT RODS
$397.95If you're building a long-stroke engine for your ATV, you need a crankshaft engineered to handle the increased demands of extended stroke geometry. The HOT RODS Crankshaft 4095 arrives factory-assembled and trued to OEM specifications, eliminating the...09210215- SKU:
- 09210215
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 250 CC
- MODEL:
- 4-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 52.20 MM
$397.95 -
HOT RODS Crankshaft Kit CBK0119
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic, you need a crankshaft assembly that's manufactured to exacting standards and ready to handle increased displacement or RPM. The HOT RODS Crankshaft Kit CBK0119 comes factory-assembled...09210356- SKU:
- 09210356
- Availability:
- Ships Same Business Day
- Weight:
- 9.00 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$595.95 -
HOT RODS Crankshaft Kit CBK0120
HOT RODS
$993.95The HOT RODS Crankshaft Kit CBK0120 delivers factory-spec performance with the durability of a purpose-built racing component. Whether you're rebuilding after catastrophic failure or upgrading for increased displacement, this complete assembly eliminates...09210357- SKU:
- 09210357
- Availability:
- Ships Same Business Day
- Weight:
- 13.65 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$993.95 -
HOT RODS Crankshaft Kit CBK0124
HOT RODS
$768.95If you're building a high-performance engine or refreshing a tired crankshaft, the HOT RODS Crankshaft Kit CBK0124 delivers factory-matched reliability with performance that meets or exceeds OEM specifications. This complete assembly arrives...09210358- SKU:
- 09210358
- Availability:
- Ships Same Business Day
- Weight:
- 13.08 LBS
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- UNITS:
- KIT
$768.95 -
HOT RODS Crankshaft 4068
HOT RODS
$150.95If you're building a long-stroke engine for your ATV, you need a crankshaft engineered specifically for the application—not a compromised OEM unit that limits potential. The HOT RODS Crankshaft 4068 arrives factory-assembled, trued to OEM tolerances, and...09210076- SKU:
- 09210076
- Availability:
- Ships Same Business Day
- Weight:
- 4.78 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 85 CC
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$150.95 -
HOT RODS Crankshaft - Stroker 4166
HOT RODS
$316.95A stroker crankshaft transforms your ATV's engine into a powerhouse by increasing displacement and torque output without sacrificing reliability. The HOT RODS 4166 eliminates the machine work and custom fabrication typically required for long-stroke...09210077- SKU:
- 09210077
- Availability:
- Ships Same Business Day
- Weight:
- 4.60 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 88 CC TO 103.5 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH:
- 47,80 MM
- STROKE LENGTH METRIC:
- 47.80 MM
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- STROKER
$316.95 -
On Sale
COMETIC Top End Gasket Set - Yamaha C3105
COMETIC
MSRP: $41.95Now: $37.76Was: $41.95A factory gasket set won't cut it when you're running high boost or aggressive naturally aspirated power levels—combustion pressure and heat cycles will compromise the seal and kill your horsepower gains. The COMETIC C3105 top end gasket set uses...09343427- SKU:
- 09343427
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $41.95Now: $37.76Was: $41.95 -
Hot Cams Stage 1 Camshaft for Honda CRF100F 2004-2013 1018-1
HOT CAMS
$244.95If you're running a CRF100F and want measurable gains in low-end torque without sacrificing reliability, the Hot Cams Stage 1 Camshaft is a straightforward bolt-on upgrade that delivers real power across the RPM band. This cam is engineered to work...XR100S1A- SKU:
- XR100S1A
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- EXHAUST LIFT METRIC:
- 5.90 MM
- TYPE:
- STAGE 1
- APPLICATION:
- EXHAUST
- INTAKE DURATION IMPERIAL:
- 236°
- INTAKE LIFT METRIC:
- 6.80 MM
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 216°
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$244.95 -
Hot Cams Stage 1 Camshaft for 1996-2004 Honda XR250R 1006-1
HOT CAMS
$377.95The Hot Cams Stage 1 Camshaft transforms your XR250R's powerband by optimizing valve timing for responsive low-end torque—ideal if you're looking for improved throttle feel without major engine work. This bolt-on upgrade leverages advanced ITR technology...XR250S1A- SKU:
- XR250S1A
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- INTAKE LIFT METRIC:
- 9.00 MM
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 236°
- TYPE:
- STAGE 1
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 8.70 MM
- INTAKE DURATION IMPERIAL:
- 236°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
$377.95 -
Hot Cams Stage 1 Camshaft for 1988-2000 Honda XR600R 1993-2009 Honda XR650L 1004-1
HOT CAMS
$311.95If you're running an XR600R or XR650L and want measurable gains in low-end pull and mid-range response, the Hot Cams Stage 1 is a straightforward bolt-on upgrade that delivers real-world performance without requiring valve spring replacement. This...XR600S1A- SKU:
- XR600S1A
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- INTAKE DURATION IMPERIAL:
- 258°
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 258°
- UNITS:
- EACH
- INTAKE LIFT METRIC:
- 8.80 MM
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 8.80 MM
- TYPE:
- STAGE 1
$311.95 -
Hot Cams Cam Chain Honda TRX700XX 2008-2009 HC92RH2010120
HOT CAMS
$50.95The cam chain is critical to your TRX700XX's valve timing and engine reliability—any wear or slack directly impacts performance and can lead to costly engine damage. HOT CAMS' heat-treated silent chain delivers superior durability and reduced noise...09251169- SKU:
- 09251169
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BASE FINISH:
- RAW
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- MODEL:
- SILENT
- CHAIN SIZE:
- 92RH2010
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
$50.95
