I believe that would be the 1986 year model.
1986 model year. Last two numbers of the serial number are the year.
The "OC" model 75 hp Mercury outboards were manufactured in 1990.
A 75 hp Mercury outboard, serial number 6559291, is a 1984 year model.
The "OC" model 75 hp Mercury outboards were manufactured in 1990.
you have a 55 hp 1980 model
As close as I can tell, the 75 hp Mercury outboard, serial number 9436217 would have been manufactured in late 1985, since the 1986-on models, were six digit serial numbers with an "A" prefix.
135kg
The dry weight of an 1985 model, 75 hp Mercury outboard is 265 lbs
The dry weight of an 1985 model, 75 hp Mercury outboard is 265 lbs.
The listed dry weight for a 1990 model, 75 hp Mercury outboard is 299 lbs.
The 1996 model, 15 hp Mercury outboard has a listed dry weight of 75 lbs.
The 75 hp Mercury outboard will need a starting battery in the 650 CCA range, although, up to 1000 CCA would work just fine.