Hi, bolla,
Your problems sound to me like they carb are carb related. First the oily deposit sound like blowback thru the inlet valve, I wouldnt worry too much, its cured by regrinding the valves, and blowback can happen to some extent if the valves are OK. Any deposit in the float bowl is bad news, a yellow rubbery deposit is from evaporation of petrol, and gums up your jets and inlet stop valve (has the bike been standing unused for a long time?). Any grit in the float bowl, is down to it comming from the tank - get an inline petrol filter - the plastic car ones with crimped paper filter are best. Grit can also get in thru your air filter, so keep this cleaned and oiled regularly.
I would concentrate on cleaning up the carb internals if they are coated yellow, use carb cleaner and do everything - jets emulsifer tubes, inside of the float bowl, have a look at the clymer manual to see whats in there. Alternatively just get a good clean second hand carb, and put that on.
---rob
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