Hi I am new to this forum.i have been given a mcculloch trim mac 240 as the person I got it off could not get it to run.when you first start it after you have primed it it will run for about 5 seconds then cut out.i have stripped it all down cleaned every bit of it even took the carb to bits and give it a good clean all the gaskets are all ok looks like it has had a kit fitted.put it all back together and it still does the same thing prime it and it runs for about 5seconds.has anyone got a clue what I should try next I have just found out that he was only using unleaded petrol instead of putting oil in with it could it be that any help please.