I have a G62 mounted inverted in a Pitts. This engine could be 10-15 years old and is equipped with a Jump Start unit. Have no idea ho many hours on it, but most of the time it runs just fine. starts OK, idles OK, transitions ok, good top.

Heres my problem - it cuts out when inverted or put into verticle angles of bank. Straight and level just fine. I have gone through the entire fuel system. Everything appears fine, the clunk is free and flopping.

Does anyone have any idea what may be causing this. The plane is a rare and beautiful 1/3 Pitts. I don't want to loose it due to a deadstick. Already had one.

One last fact. I've only had this plane for a short time and only flown it six or seven times. so I got no history with it.