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Yamaha F4BMHS

Yamaha F4BMHS

















New lightweight single cylinder Yamaha F4B four stroke with a manual starter and tiller handle. Enhanced features include a larger shift handle, toggle clamp and throttle grip than in other motors of the same class. Low vibration rubber mounts are fitted between the powerhead and bottom cowling and at the base of the tiller handle, and a balance weight on the tiller handle effectively reduces vibration of the same. Front and back, large easy grip carry handles makes these engines easily transportable and, very importantly, the engine can be stored on either side or on its front without leaking engine oil due to Yamaha's original oil leak prevention system. This means you will no longer have to worry about oil leakage when carrying the engine in the trunk of your car. A wet sump system with oil lubrication pump, as used in higher-end models, provides more reliability in engine lubrication. An auto decompression device fitted to the camshaft makes the manual starter much lighter to pull. A small, auxiliary prime pump is fitted to the fuel pipe before the carburettor in the cowling. By ensuring delivery of fuel to the carburettor, the engine can be started smoothly even after long-term storage. A DC 12 volt-6 amp alternator can be optionally fitted to provide electricity if required.

  • Max prop shaft output 2.9kW (4hp) @ 4500 rpm
  • Full throtle RPM range 4000-5000 rpm 
  • Idling engine RPM 1500 + or - 50 rpm
  • Fuel consumption 1.4 litres per hour @ 4500 rpm
  • Engine type OHV 1 cylinder
  • Displacement 139cc
  • Bore and stroke 62.0mm x 46.0mm
  • Compression ratio 8.9
  • Starting device - manual choke
  • Fuel induction system 1 - Carb
  • Built in tank capacity 1.1 litre
  • Male fuel connector fitted as standard for remote tank
  • Lubrication system - Wet sump
  • Engine oil capacity - 0.6 litre without oil filter
  • Ignition system CDI
  • Spark Plug CR6HSB
  • Alternator (Optional) 12V - 6 amp with rectifier regulator
  • Cooling system - raw water, thermostatically controlled
  • Exhaust system - above prop
  • Trim positions 5 steps
  • Shallow water drive positions 3 steps
  • Steering angle 90 degrees each direction
  • Gear shift F-N-R
  • Gear ratio 2.08 (27/13)
  • Propeller fitting - spline
  • Propeller rotation - clockwise
  • Shaft lengths short or long (see drop down below for ordering)



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F4B Yamaha F4BMHS (Weight 27.00Kg) 889.00

Address: 94-98 Highland Road, Eastney, Portsmouth, PO4 9NQ Tel: 023 9273 2985 Fax: 023 9229 6065 Email:
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