I have a 1988 Honda SB50P Elite 50E that has been setting unused for quite some time. I cleaned carb. etc out thoroughly. I can get the bike started by removing spark plug and squirting a little gasoline into the spark plug hole.It will start and run this out. However, when I put fuel in the tank and start cranking, it will not start and the crankcase starts filling up with gasoline and oil mixture until the piston locks up. Anybody know what the problem is and how to correct it? Would appreciate some help. Thanks