because your impellar is not pumping enough water to the engine to cool down so it's getting to hot, you probably need to change the impeller, even if water comes out it still could be worn mine was pumping water ok but when i took it off to check there was only one flipper left on it.
55 hp.
A 9.9 hp Mercury, serial number OG031959, is a 1995 year model outboard.
change your thermostat
A 90 hp Mercury outboard, serial number OG242239, would be a 1995 year model.
all mercury outboards mix 50:1
A 20 hp Mercury outboard, serial number OG156340, is a 1995 year model.
The 1995 mercury 25 hp outboard has an approximate weight of 95 pounds. Use care when mounting on a boat already on the lake, as the engine could easily be dropped into the water.
The plug gap for a 1995 model, 40 hp Mercury is .035 in.
the mercury serial that starts with OD started from 1992 -1995
The 1995 model, 25 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
1995
75 to 80 pounds