The other day I took the bike out up and down the road. We have had a lot of cold weather lately and I wanted to start it up and make sure it is doing ok. I took it out and when I came back and parked it to let it idle for a few minutes. I noticed a real heavy exaust smell. It burned my nose when it hit me. Any ideas? My brother (Harley rider) says my carb needs clean and reccomended I get in gas carb cleaner.