Originally Posted by M7H

Common "problem" with engines in general....

lean out the bottom end, and lower the idle rpm.....

You can try this on the startbox.
When engine goes back from full rpm, listen to it.
If it idles high and after a few seconds goes down in rpm, the bottom end is to rich.
If it idles low, and after a few seconds the rpm goes up, the bottom end is to lean.....