Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
Re: Drilling throttle blades
No, never use the secs to adjust idle. All butterflies should be set to allow the .020 open idle transfer slots, and if the engine needs more air, then, drill the holes, (NOT YELLING, JUST EMPHATIC), DRILLING THE HOLES IS VERY DELICATE, USE A HAND HELD DRILL HOLDER, GO SLOW, DON'T TAKE BIG CUTS.
Lots of people make the error to adjust idle with the secs "idle screws", but that isn't the way it needs to be done.
One mod I do is to take the base plate off the carb, set the transfer slots for their opening, and then, scribe a line on the throttle bore on the TOPS of the butterflies, and put it back together. Now, I can look down the bores and see if the plates are in the right places if settings for plates opening get changed, without taking the carb off to do so. Just my way of making it easier for me.