This past winter I used year old fuel stabilizer in my bike. I had a bad feeling just after I did that. Once or twice this winter it was hard to start.(Carb heaters??) Naturally I cranked on the throttle(to flood it!) and then once I started to try and ride this spring I had problems. I didn't have 'full power' until something 'kicked in' after a few miles. This happened a couple of times.One of the cylinders was definitely not kicking in--it was cool to the touch. Then I got new spark plugs(I was out of town on a weekend trip and found a dealer close to where I was staying)and it helped alot BUT one time while riding I could feel it 'miss' and I lost some power but it recovered pretty quick. I haven't drained the bowls yet. It was suggested also that I use some Berryman 12 (B-12) to clean up the carb. Think I need a trip to the mechanic?? I read about the carb heaters on this site and don't know if that was a cause of the problem, or problems! Can anyone tell what's going on? I could manage some simple mechanicing, but anything more then I go to the shop.