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 |