20HP
If you're looking for the winning combination of easy handling and
great control, look no further than the reliable 20hp.
 
SMALL-ENGINE CONVENIENCE, BIG-ENGINE PERFORMANCE
This versatile, twin-cylinder 4-stroke combines power and responsiveness - and delivers a super-smooth ride. Outstanding fuel economy also means that you're being kinder to the environment, with exhaust emissions cut to a minimum.
Enjoy too, the many extras that only a Yamaha outboard delivers. Benefits like computer-controlled ignition, a special light-load starting system, a water-cooled fuel pump, and a large-volume silencer – all normally only found on larger engines. For commercial, professional or leisure use, it adds up to a winning formula.
 
Steering friction
You'll find the 20hp very easy to control and comfortable to drive, thanks to its many features - from the front-mounted shift lever and single-lever steering friction adjuster to the light-load recoil starter. A built-in handle on the steering bracket and resting pads on the rear, make for convenient handling and portability too.
 
PrimeStart™
Start your outboard engine as easily as starting a car – even from cold. Exclusive to Yamaha, the PrimeStart™ system ensure that the engine fires first time, every time you engage either the Electric or Manual Start.
 
High-output alternator
Never get left short. A High-output alternator ensures that power is always available to start the engine – even after prolonged periods of idling or when you've been running at low revs and using numerous accessories.
 
High-output alternator
Never get left short. A High-output alternator ensures that power is always available to start the engine – even after prolonged periods of idling or when you've been running at low revs and using numerous accessories.
 
Shallow Water Drive system
Cruise towards the shore with confidence thanks to Yamaha's Shallow Water Drive system. Offering ample protection for your propeller, it allows you to get as close as you need to be, no matter whether you're cruising a murky lake or the crystal clear shallows of the sea.
 
F-N-R (Forward-Neutral-Reverse) gears for easy control
Manual gear selection allows the engine to be warmed up in Neutral. The propeller will not turn until Forward is selected for safer idling. Ensures smoother acceleration and better control especially when turning. On Electric Start versions, the power supply to the starter motor is isolated until Neutral is selected.
 
Engine type
4-stroke
Displacement
432 cm³
No. of cylinders/configuration 
2/In-line, SOHC
Bore x stroke
65.0 mm x 65.1 mm
Prop shaft output at mid range
14.7 / 5,500 rpm
Full throttle operating range
5,000 - 6,000 rpm
Lubrication system
Wet sump
Fuel Induction System
EFI
Ignition / advance system
CDI
Starter system
Electric/ Manual, Manual (MH), Electric (E, EP)
Gear ratio
2.08 (27:13)
 
 
Recommended boat transom height
S429L:551mm
Fuel tank capacity
separate, 25litres
Oil pan capacity
1.1litres
Weight without propeller 
56kg - 63kg