50HMHOS & 50HETOL Yamaha Outboards

Engine Specifications: 50HMHOS & 50HETOL


Engine Type In-line 3
Displacement 698cm³
Bore x Stroke 67.0 x 66.0mm
Compression ratio 6.1:1
Starting enrichment MHO, MHD: Manual choke WHTO, ET, ETO: Prime Start
Scavenging Loop Charge
Fuel induction system 3 Carburettors
Lubrication system ET: MHD: Pre-mixed fuel and oil MHO, WHTO, ETO: Oil injection
Oil-Fuel Mixing Ratio MHD: 50:1
Engine oil capacity MHO, WHTO, ETO: 1.5L
Ignition system CDI
Ignition timing ATDC 7.0 – BTDC 25.0 deg.
Spark plug B7HS-10, B8HS-10
Alternator ETO WHTO: 6A
Cooling system Raw-water, thermostatically controlled
Exhaust system Through Propeller Boss
Dry weight 75 – 93kg

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