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this depends on the make and year and horsepower .older models used ratio of 25-1 and newer ones used a ratio of 50-1. some have even went to 100-1 but if I had to error I'd rather have too much oil than not enough to lub the cylinder wall and piston. oil only makes them smoke more
not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.