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Onan bf loses spark after 5 minutes of running. Robert 3-26-16  
My 1977 Allegro has a onan bf generator. After about 5 minutes of running, spark gets week, you can smell the excess fuel and finally floods out.. wait 5 minutes and it starts back up and runs for a shorter time and does the same thing... I am thinking COIL?
Re: Onan bf loses spark after 5 minutes of running. Bubba The Bus Tech 3-28-16  
So the common suspects for your issue in order of expense to repair:

Bad ground or positive conection in ignition circuit, usually on the engine and sensitive to heat. This is fairly common and real pain to find. Usually a problem between a wire and a crimp style conector.
Bad/miss adjusted points if equiped, Rare but cheap.
More common is a bad condensor.
Then the coill is the next suspect.
For electronic ignition this sounds like a pick up coil.
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