I just installed a .53 Irvine inverted in my Seduction Freestyle, and was having quite a difficult time getting a low idle....it worked great at 3/4 to full....I riched up the idle adjustment, and now it purrs........I have it set at such a slow idle now, that I'm sure it's going to die at any moment...but never does!!! If you dont have one of these engines.....get one!