Tried to put the boat in for the season. 1 engine started right up but the other one just cranks but won't fire. Any ideas? Tried changing the spark plugs but that didn't make a difference. Sounds like it wants to go but just won't catch. Pulled spark plugs and they have just a bit of oil on the bottom. Tried full choke, no choke etc. Even tried a bit of throttle and that makes it sound a bit more eager to fire but still won't go.