4CMHS & 4CMHL Yamaha Outboards

Engine Specifications: 4CMHS & 4CMHL

* Please note that this motor has previously been branded as a 5CMHS, however due to certain international regulation, it has been rebadged into a 4HP.  This engine will still deliver the same performance as the previous 5HP

Engine Type 1-cylinder
Displacement 103cm³
Bore x Stroke 54.0 x 45.0mm
Compression ratio 6.5:1
Starting enrichment Manual choke
Scavenging Cross Flow
Fuel induction system 1 Carburettors
Lubrication system Pre-mixed Fuel and Oil
Oil-Fuel Mixing Ratio 50:1
Engine oil capacity
Ignition system CDI
Ignition timing BTDC 5.0 – 28.0 deg.
Spark plug B7HS, BR7HS
Alternator 60 W (optional)
Cooling system Raw-water, thermostatically controlled
Exhaust system Under Water
Dry weight 21 – 22kg

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