Re: Fuel in oil ??
Fuel in oil was common TL suzuki problem at early models, It was down to engine running cold, because engine temp sensor was located to radiator instead of termostat housing(suzuki changed it to the termostat housing year later).
Bike was running cold map all the time. Thus diluting cylinder walls with fuel. There is always little oil going to the oil, but it vaporates when the oil heats up and the breather system suck the vapor out and burns it.
What kind of temp your bike is running at? Do you drive short or long distanges?
Try injector cleaner used in cars.?
Change the oil, fuel is not good for the bearings.