When you say fumes are you smelling the exhaust fumes while riding or does it smell like gasoline? I could smell exhaust fumes when riding on my 96" inch motor
Good question. At first I did think it was exhaust with a lot of unburned fuel, and there had to be some freakish air flow pattern that whipped the exhaust around to the rider or something. It made no sense to me. Plus, it just didn't smell like exhaust; it smelled like gasoline. The explanation here by Jerry makes perfect sense, that it was leaking out around the gas cap.
Anyway, I'm just happy that I can smell fresh air now when I ride.