You can find a Mercury 15hp 2-stroke operating manual on the official Mercury Marine website, where they provide downloadable manuals for various engine models. Additionally, you can check online retailers like eBay or Amazon, where sellers often list both new and used manuals. Lastly, boating forums and community groups may have users willing to share digital copies or direct you to resources.
You can get it here: http://www.selffixer.com/outboard.motors/mercury/1986plus.Mercury.6-8-9.9-15HP.2-Stroke.Service.Manual.htm
A 15hp mercury requires a fuel to oil ratio of 50:1, roughly one pint of 2 cycle oil, to six gallons of gasoline.
50 to 1
thats the same engine and same weight.
The top uppermost cylinder would be the no. 1.
A 15 hp Mercury outboard, serial number OD248758, would be a 1993 year model.
The serial number OC111736 for a Mercury 15hp outboard motor indicates that it was manufactured in 1981. Mercury outboard motors typically use a coding system where the first letter represents the year of manufacture, and "O" corresponds to 1981 in this case. For precise confirmation, you can also contact a Mercury dealer or refer to an official Mercury outboard serial number guide.
The 15 horsepower Mercury outboard motor does not have a water pump. The outboard motor is air cooled and does not have a need for circulating water.
I have a 15hp Nissan 4-stroke on a 14x32 Jon Boat and have a 13" pitch Powertech Prop and I get a max speed of 34.5mph.
The 15 Mercury, on a 14' boat, would easily plane out with one passenger aboard. This combination should also work out with two passengers, though it won't be a speedster.
The card is required for operating a boat with a motor of 10 HP ... or a wind driven craft over 14 feet in length.
About 15HP