I am working on an old actic cat panther with the spirit motor. It seems to be flooding out but yet will only start with the choke on. When I do get it started it will rev really high and then wind down and die like it is running out of gas, but yet it has gas and oil pouring out of the exhaust. It is the Mikuni butterfly carb. I have had the carb apart and it is clean. Any one have any ideas? Please!