started it today for the first time she will fire right up and then backfire and die. carbs? checked spark still have spark checked timimg its right at TDC when the mark on flywheel is at the trigger arm. any thoughts? I'm betting that woodruff key sheared I'm horrible with these it's my weakness. I know when I put it on it slipped on and dropped into place tourqed it down good. if it ruined the shaft Im in deep trouble. thanks
