Originally Posted by leftywoody
A kickback sounds like the timing is advanced a tooth or so
A "tooth or so" HOW? the magnet is keyed to the left side of the crankshaft w/a Woodruf key, not gears. If ignition timing is suspect, then I'd check to see if the key has sheared. I've seen this many times on lawnmower engines, especially after somebody tried to take the top off a rock.