The scoot picked up some bad habits over the weekend and I don't know why.
All of a sudden, the idle is real low, on acceration, in all gears, it started sputterring then eventually smooths out. On deacceration it backfires, if suddenly it sounds like a M-80, if not so suddenly not quite as loud.
I pulled the plugs which are all realitively new, like a month old. They all have about the same light covering of black dry soot.
Over the weekend I was riding two up pulling a trailor.
Got any hints?