My 70cc aerox decided to make me late again today. Just sorted it out yesterday it was running the best it has in ages when I went up a bridge and lost all power and it died. After wipping the spark plug out it looked oily and a dark brown colour (electrode). It would start up fine but wouldnt idle well and would.often die out. When reved the bike would rev a few times then it would 'bog' sounds like air being sucked through airbox but nothing more. ATM its chained up anyone got anything that I could try to get it going? Thanks