I just got a 1971 Torrot Turismo. It's a beautiful bike but both I and my neighbours find it really loud and pollutive. Someone told me that to reduce the ratio of oil to gas in my mixture might help it a little as well as use really really good 2 stroke oil. Can anyone recommend to me a good brand as well as the ratio I ought to use? Also, where could I get a new muffler for this thing?