I have a 1986 28 hp spl johnson. the motor run really well but seems to be smoking too much. i have just treated it with seafoam and i know it smoked more while i was doing that but it smoked a lot before i did the seafoam and it is still smoking a lot i dont know why . what could this be from. the fuel mix is 50:1 what can i do to fix this what things can i check. and what will it hurt to run it this way? are there any signs i should look for? i would just like to know what could cause this thanks guys.