have a 1970 cb450k1 with 300 miles on it, that has obviously been sitting a while. Got it running for a while, but every time i get it started, fuel poors out of the top vent from the cylinder head. If i keep it running for 10 mins. or so it stops. Also drained the oil and there was more gas than oil. I rebuilt the carbs, but still doing it. Any suggestions would be greatly appreciated.