I bought a boat motor with a Tecumseh power head a couple of years ago and was told that it is a 3.5 hp ESKA and I am trying to find the specs for setting the points, fuel mixture and carb kit. The only number I can find is on the metal tag on the mounting bracket which is 87 300990. Can anyone tell me who made this unit or is there somewhere else on the motor that a model number can be located? Thanks