Is the ignition timing adjustable? My motor pings sometimes under load at light to medium throttle (2nd gear). I have increased the main jet to a 160 and the pilot to a 48 and 2 1/2 turns out on the pilot screw. Using preminum gas. I did have the keyway shear and the dealer fixed it, but I was wondering if the ignition timing changed or was set properly. If anyone has any ideas I would appreciate it.