Just an update for everyone because I am hoping that this post can be used for everyone who buys an old moped because out of the 6 I own 5 had old gelled up gasoline in the tanks. I have the bike engine taken off and the tank soaking in a salt vinegar solution. So far a lot of sedement has come out but not enough to relinquish my worries.
Next step is soaking the tank in acetone for 3 full days while I'm on vacation.
Keep you posted!