I just purchased a 2013 Stratolner. I brought it home Saturday, from the original owner's location. This was a ride of close to 140 miles. Rode and handled like a dream, but when I put her in the garage, in the course of time I noticed a gurgling sound. It seemed to be coming from the fuel tank, and the garage filled with the smell of gas. Is this from engine heat? Is it natural? There was no fuel under the bike, and with a window open the smell went away.