I would say one per spark plug.
The dry weight of a 1983 model, 40hp Mercury outboard, is 156lbs.
A 40 hp Mercury outboard, serial number 5897057, would have been manufactured in late 1981.
Need to know if its 2 or 4 cycle.
The plug gap for a 1995 model, 40 hp Mercury is .035 in.
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.
I have a 1996 Mercury 4 cylinder 40hp with 125 Psi across all 4 cylinders. I also have a mid 80s Mariner/ Yamaha 40hp 2 cylinder with 123 Psi both cylinders. I'm not sure what factory specs are, but maybe this would help.
how do u check timing in a 40 hp yamaha 2 stroke
yes
The dry weight of a 1992 40hp Johnson is between 180 and 190lbs. depending on the model.
it is exact 67 kgs
Yamaha 40hp 6h4l1001833
An Oil Injected motor will have a separate Oil Resevoir, so mixing Oil and Gas is not required, and in fact inadvisable.