Re: Replacing Stock Carb
The screw on the carb does nothing but physically move the slide up or down to adjust idle speed.
Moving the C-clip up a notch will make it leaner, down a notch will make it richer. You HAVE to look at the plug to see where it's running, then adjust accordingly.
I'll bet you arew rich and it's four cycling at anything over 3/4 throttle.