2002 Gilera Coguar "benzin" Questions

I want to know is it true that 4stroke motor uses only benzin or it can use benzin+oil? I have buy scooter ZN50QT-19 and i dont know which kind of fuel he uses :)He is 4 stroke All four stroke motors ...

I have a problem with a carborator I got always an oilspill. How can I solve it? if its an oil leak its coming from the breather meaning a valve problem. if its gasoline(petrol) (benzine) then its a ...