You posted a thread about the problem you had with an inverted Evolution 100 NT. If you could, please reply or contat me via PM. It seems my problems are just about identical to yours and I want to find out what spring you used. I don't race cars so I am not sure what to get to try to fix my problem.

Background: I have the engine on an Excelleron 90, mounted, of course, upside down. And, your problem symptoms match mine just about 100%.

Thanks in advance.

DS.