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All Yanmar Saildrives feature the patented double-seal safety technology with audio warning device. These are lightweight, compact diesels with SD25 or SD60 drives. They help eliminate shaft vibrations, noise, alignment and space problems with their direct power-to-prop configuration. Boat balance, manoeuvrability and thrust are improved.

Reduction gear system Constant mesh gear with dog clutch
Reduction ratio (fwd / asn) 2.64/2.64
Propeller speed (fwd / asn) 1364/1364
Direction of rotation
(propeller shaft - fwd)
Counter clockwise viewed from flywheel side
Dry weight Saildrive 30 kg (66 lbs)
 
 2YM15C x SD203YM20C x SD203YM30C x SD20
Configuration
4-stroke, vertical, water cooled diesel engine
Maximum output at crankshaft 10.0 kW (13.6 mhp) / 3600 rpm1 15.3 kW (21 mhp) / 3600 rpm1 21.3 kW (29.1 mhp) / 3600 rpm1
Continuous rating output at crankshaft 9.4 kW (12.8 mhp) / 3489 rpm 14.7 kW (20 mhp) / 3489 rpm 20.1 kW (27.3 mhp) / 3489 rpm
Displacement 0.57 L (34.7 cu in) 0.854 L (52.1 cu in) 1.115 L (68 cu in)
Bore x stroke
70 mm x 74 mm (2.8 in x 2.9 in)
76 mm x 82 mm (2.9 in x 3.2 in)
Cylinders 2
3
Combustion system
Indirect injection
Aspiration
Natural aspiration
Starting system
Electric starting 12 V - 1.4 kW
Alternator
12 V - 60 A (80 A optional)
Cooling system
Fresh water cooling
Lubrication system
Enclosed, forced lubricating system
Lubrication oil for Saildrive
API GL4 or GL5 and SAE 80W90 or 90
Direction of rotation (propeller)
Counter clockwise viewed from flywheel side
Dry weight with Saildrive 134 kg (295 lbs) 151 kg (333 lbs) 157 kg (346 lbs)
Environmental
EU RCD, BSO II & EMC
Engine mounting
Rubber type flexible mounts