I was royally pissed off when my pilot screw FELL OUT, and ended my day prematurely. I was even more pissed when that little bugger cost me over 30 bucks to replace. My solution is so simple I think everyone should do it as a precaution: Simply put a couple thin strips of duck tape (if you can't duck it...&%$#@! it!) or elec tape over the little hole. That way if it backs out onya, at least it won't fall out!!! If you got a kouba maybe you should wrap a thin piece of wire to anchor it to the carb. Don't let your pilot ruin your day!!