2002 TRX350FM Throttle screw setting???

Hi yall... Noob to the forum here...and having a problem w/ my wheeler! 2002 TRX350FM Rancher 4x4. It wasn't idling very well and I began to turn the "Throttle stop screw" a bit and found a nice spot that it idled nicely at. Rode for hours and all was good..Then it sat for a few days and now it wont start..or fires up and then dies immediately. I've foolishly turned the Throttle stop screw in both directions quite a bit w/ not luck. Is there a point where it should stop screwing in or out? ...and if so... can anyone tell me approx how far out or how many turns it may need from a closed or open postition to perform correctly? Thinking about pulling the carb and cleaning it out. Just thought I'd post this somewhere before I mess things up to much. THanks in advance for any help.
Pear