My problem started with needing a new Ignition Coil. We replaced the coil but during the installation, the two lower gears of the engine fell out. I purchased the manual to help put the gears back in but after we got the engine back together, the fly wheel will not make a complete 360o rotation. It gets stuck rotating in the same spot in both directions. What is my next step. We checked the timing again and it is correct as the manual states.