Hi!
Did you honestly belive that running an ABC engine a little rich would destoy it...???[8D]
Nothing could be further from the truth!
You can run any two or fourtsroke as rich as you like without destroying anything.
The only thing destroying our engines is heat (running too lean, wrong compression, wrong glowplug, too much nitro) and dirt.
Nothing else!
Our engines can tolerate much... we don't have to be soo finicky about how rich we run them as long as we don't run them too lean!

Regards!
Jan Karlsson
Sweden