The weight of the 90 hp Yamaha, as well as other brands, varies with year model. On average the Yamaha 90 weighs in at 256 lbs.
300 lbs
The dry weight of the 1984 model, 90 hp Evinrude outboard is 305 lbs.
The listed dry weight for a 1993 model, 90 hp Force outboard is 249 lbs.
538 lbs.
170kg
247 lb
429.7 pounds.
A 150hp Mercury outboard weighs from 390-424 lbs. depending on the model. The Optimax 150 is heavier at 443- 455 bs.
Mine, with electric start and manual tilt, weights 160lbs.
Assuming you're asking about Yamaha outboard engines, a 2 stroke Yamaha 40 weighs about 190 pounds while a 4 stroke Yamaha 40 weighs about 220 pounds.
The dry weight of a 1984 model, 40hp Yamaha longshaft w/ electric start, is 165 lbs.
Anywhere from 300-500 lbs.