Why 2.5 turns?
When I bought the bike it backfired on deceleration so I marbled (coppered). Backfiring was cut way down. Then, because of the many suggestions here, I adjusted the fuel/air mixture to 2.5 turns and the bike SEEMED to run smoother. Now, after installing Cruzers this week, the popping on decel is back. Do I go leaner or richer? Should I even care?
Why is 2.5 turns recommended? Are we adjusting for smoothness, RPM, popping on decel, what?? There must be a reason approx. 2.5 turns is optimum. Has anyone made that adjustment using a vacuum gauge?