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The dry weight of a 1984 model, 40hp Yamaha longshaft w/ electric start, is 165 lbs.
The dry weight of a 1983 model, 40hp Mercury outboard, is 156lbs.
The dry weight of a 1992 40hp Johnson is between 180 and 190lbs. depending on the model.
538 lbs.
170kg
247 lb
429.7 pounds.
The dry weight of the Mercury outboard FourStroke 40 HP boat motor released in 2005 is approximately 250 pounds. Later versions of this motor are slightly lighter.
A 150hp Mercury outboard weighs from 390-424 lbs. depending on the model. The Optimax 150 is heavier at 443- 455 bs.
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.
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.