F20LMHB Yamaha 4 Stroke 20hp Long Shaft



Engine Type Two-cylinder, In-line
Displacement 432 cc
Bore x Stroke 65 x 65.1 mm
Full Throttle RPM Range 5000 – 6000
Variable Trolling RPM Range 750–1050 rpm
750–1050 rpm 900 rpm
Horsepower Rating at Propshaft 20 hp at 5500 rpm
Compression Ratio 9.3:1
Fuel Induction/Scavenging SOHC, 2 valves per cylinder
Alternator Output 16 amp
Starting Method Manual
Ignition CDI Microcomputer
Lubrication Wet Sump
Degree of Trim 4 positions (manual operation)
Degree of Tilt -4 through +62˚ (manual tilt)
Exhaust Through Propeller
Cooling Water, Thermostatic Control


Gear Shift F-N-R (Forward-Neutral-Reverse)
Gear Ratio 2.08:1


See Model Code S=15″ L=20″


Recommended Fuel Regular Unleaded
Recommended Fuel Filtration Yamaha 10-Micron or Mini-10TM
Recommended Oil Yamalube® 4-M 10w-30
Engine Oil Capacity 1.1L / 1.0L (w/without filter)


Recreational 2 + 2 Years
Commercial 1 Year


  • F20SMHB = 57 kg
  • F20LMHB = 59 kg
  • F20SWPB = 62 kg
  • F20LWPB = 64 kg

*Weight estimated at time of publishing includes standard propeller, which is included with this model. Weight is measured without motor and gearcase oil.



General Features:


  • Enhanced Acceleration and Performance Under Load
  • Single Overhead Camshaft
  • Battery-less Electronic Fuel Injection
  • Wide-Span Mounting System


  • CDI Microcomputer
  • Wet Sump Lubrication
  • Engine Warning System
  • Mechanical Single Throttle Valve Intake System
  • SST Drive, Prop, Shift Shafts
  • SST Steering Tube
  • Magnetic Drain Plug
  • Sacrificial Anodes
  • YDC-30 Aluminum Alloy
  • Phaze FiveTM Paint System
  • Electro-deposited Powerhead Paint Process


  • High-Output (16-Amp) Alternator
  • Electric and Pull-Start Available Together (some models)
  • Retrofit Electric Start Available
  • 45-Degree Steering in both Directions
  • Built-In Resting Pads and Carry Handles
  • Variable Trolling RPM Switch (VTS®)
  • Freshwater Flush
  • Spin-on Oil Filter
  • Offset Steering Friction Lever
  • Auto Decompression Device
  • Vibration Reduction Mounting System
  • C.A.R.B. Ultra Low Emissions 3 Star Rating
  • External Oil Drain Plug

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