I have a 1988 Yamaha Yfm100 Champ that I'm trying to get running for my 3 boys to ride. So far I have replaced the cdi, ignition coil, spark plug, ignition switch, battery, carburetor and the stator. The starter engages but it won't turn over. I'm getting fuel into the carb bowl, I have spark and I believe it has compression. Any ideas what I can do next to get it to turn over and run? Thanks