Yeah I did tighten the screw at the front. I was using blue locktight but today I am going to try using copper rtv, we shall see what happens, mabey once that is fixed I can move on to the other problem with this engine...........it doesnt like to stay running. I honestly believe that it is a related problem, whener it the exhaust starts to rotate the engine begins to surger then quits. hopefully it cures all my problems........including a nagging girlfriend who wants me to do housework before I go flying!