Never heard of this before and I ride with a few others with 250F's. I did adjust mine to 2 1/4 turns out with a Dubach pipe and all seems to run crisp. I'll keep an eye on it. Went to Glen Helen yesterday and saw the first day of the YROC. Holley and Glover had the best speed. Holley was second in the first moto on a 250F behind Marty Smith and Glover was leading the second on a 250F till a flat tire slowed him to 4th. The 2002 bikes look good. The 2 - strokes got the most attention. The thumpers got cleaner swing arms,sub-frames and hubs.
I was at a little over 2.5 with race gas (B37), was running great... then pop-pop-pow! I knew right away what happened... did the trusty "stuff a stick in it" routine to get thru the rest of the day :) Ran surprisingly well.
The concensous is the spring is too week. So I'm off to lay down $25. for .25 worth of screw and spring. I'm going to stick some kind of rubber plug in there to make sure the screw stays put.