30HMHS, 30HMHL & 30HWL, 25BMHS & 25BMHL Yamaha Outboards

Engine Specifications: 30HMHS, 30HMHL & 30HWL, 25BMHS & 25BMHL

Engine Type In-line 2
Displacement 496cm³
Bore x Stroke 72.0 x 61.0mm
Compression ratio 6.2:1
Starting enrichment Manual choke
Scavenging Loop Charge
Fuel induction system 1 Carburettors
Lubrication system Pre-mixed Fuel and Oil
Oil-Fuel Mixing Ratio 50:1 (ZAF 100:1)
Engine oil capacity
Ignition system CDI
Ignition timing ATDC 2.0 – BTDC 22.0 deg. ATCD 2.0 – BTDC  25.0 deg.
Spark plug B7HS-10, B8HS-10
Alternator 80 W (W, WC: 6 A)       80 W (W, WC, WH: 6 A)
Cooling system Raw-water, thermostatically controlled
Exhaust system Through Propeller Boss
Dry weight 30H 53 – 58kg
Dry weight 25B 53 – 57kg

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