this may sound dumb but i am a bit confused, i cannot seem to find and oil plug on my 87 js550 I was wondering if there is even any oil in the bottom of the motor, or does the engine get all of its lubrication from the mixed fuel. It doesn't seem right to me. Any help would be appreciated. also I just bought the jetski and was wondering what i should mix the fuel at? my best guess from reading is 40:1.