Join Date: Mar 2006
Location: Jackson, California, USA
Make: Honda GoldWing
Model: 88 GL1500
Recently I put a poor-boy kit in my buddy’s 1200. While pulling the belts off I also pulled the crank pulleys also. In between the the pulleys is the pick-up plate. It’s possible to flip it over and the timing would be way off. That could cause a backfire like you discribed.