Registered Forum User
WSB Hero
Bikes: 1993 - 944SS & Aprilia Falco
Posts: 7,795
Join Date: Oct 2002
Location: north east
Initial thought is fuel gone bad but I'm told fuel additives are better than they used to be...
Maybe check for water ingress in tank if possible other wise, stick some high octane fuel in and ride until better.
Good luck...