Main Motorcycle: '01 Triumph Bonneville
Join Date: Sep 2012
Well indeed it was a fuel mixture screw problem. I was actually too lean. After much trial and error, it seems as if 2.5 turns out on each produces very little off-idle coughing back through the airbox. At about 1.5 turns, I was getting repeatable cough-backs through the air box that I could feel when placing my hand at the airbox opening.
Could my valves also need an adjustment? I'm at about 11300 miles.