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Mariner 1985 115 hp runs rough

Hello There
This is my first time posting, I have a 1985 115 Mariner on my first boat. The problem is that when running on idle the engine is (a) Very smoky and (b) runs very rough yet on full throttle the boat is very fast. So i guess my question would be how can I solve this and also can anybody advice me what the ratio of oil to petrol would be??
Many Thanks :)
 
Re: Mariner 115 hp runs rough

I have the same issue with a mariner I just bought that had the gas sitting in it for a year, was told that possibly the low speed jets? have varnish on them, kinda like coronary disease, clogging up, I would not venture to suggest a treatment, but I was told that seafoam or some other form of injector cleaner may help, that or a trip to the shop to get them cleaned out, the seafoam would be my first pick as it would be cheaper...
 
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