I have a 2010 SGtrike with 56K. Lately I've been smelling gas fumes when I open the garage. Also, if I don't ride it for a few days it start very hard like it's either flooded or not getting gas. Once it's been running it starts fine. Yesterday after I rode it into the garage and shut it down there was a strong smell of unburned gas coming from the exhaust. And when I was riding with a buddy the other day he said he could really smaell my exhaust when I got on the throttle. I No leaks that I can see. Any ideas?