try oldmercs.com you should be able to find a manual there
1983.
An 80 hp Mercury outboard, serial number 6304884 is a 1983 year model.
An 80 hp Mercury outboard, serial number 6288030 is a 1983 year model.
A 25 hp Mercury outboard, serial number 6370735, would be a 1983 year model.
the age is 1983 mercury buddy.
An 80 hp Mercury outboard, serial number 7206568 would be a 1983 year model.
The dry weight of a 1983 model, 40hp Mercury outboard, is 156lbs.
The dry weight for an 1983 model, 80 hp Mercury outboard, is listed as 265 lbs.
One manual has the number 6263906 listed as a 1983 model
The best solution is the find a service manual for that motor. I have seen these in libraries and they are for sale on the internet.
An 50 hp Mercury outboard, serial number 6276691, is a 1983 year model.
An 40 hp Mercury outboard, serial number 7197998 would be a 1983 year model.