Thank You for such a good and complete response.
I actually did have it running and it ran very well but restarting was so difficult I gave up and sold it on ebay, But I found another one to try out all your stuff on. and while in the past lower compression did not help which is why I went to the TD head I will investigate that again along with the other things before I give up on my last medalion .
as for fuel it is old Byron's 35% wit plenty of castor and has been stored with no air in the container so I doubt it's much of a factor but could be. Prop is as stated a Grish tornado 6 x 3 had no problem getting fuel draw and it ran more consistent than most cox engines once running, I do use the fuel tubing over NV to seal out air even use anaerobic sealer on heads some times, you can't use shellac based sealer because fuel will dissolve it.and silcone is to thick.
Thanks again
Jayd