The 1978 model, 115 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
1978 80 Mercury Outboard IDLE ADJUSTMENT
You may have mistaken the '1' for a '2'..if your engine is a 4hp 2 cylinder it dates from 1978.
1978
A 50 hp Mercury outboard, serial number 5111678, is a 1978 year model.
1978
50:1
The 1978 model, 9.8 hp Mercury outboard, requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
A 9.8 hp Mercury outboard, serial number 5208019 would be a 1978 year model.
Hello.... it appears your outboard is a 1978.
50:1
A 90 hp Mercury, serial number 4849632, is a 1978 year model outboard.
The 1978 model, 75 hp Mercury outboard, requires a 50:1 ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.