OK guys... could yall help me make sense of this? Evidently I lost a bump head spring, which allowed my line to advance itself. It stayed close enough to just the right length through most of a spool that I didn't even realize it until I went to do a rough cut. I was cutting along side a long driveway going up to one of my mountain-top residential sites. The line pulled out too long and I didn't have my clippers with me as I had a spare spool in my back pocket. So well I burned off the excess on the pavement. Right at the end of the driveway cutting it did it again. So I attempted burning it off again, which for reasons that puzzled me at the time, I couldn't seem to get it to happen. (Didn't realize the spring was not in the head) So I'm reving and burning, and it shuts off. I thought I was out of gas, so I went to fill up. I had pretty much burned a full tank. Filled it up. Couldn't get it to crank back. Turns out later that I guess I burned up the ignition coil. The trimmer is an '02 I think, certainly on the orginal coil, it was near 100 degrees out and I had been running HARD. Well, I bought and installed a new coil ($30). It fired right up. But the top end was trashy. I couldn't find my feeler gages, so I reset the air gap on the coil with a business card. (I figured that was about right). Well, the top end was still trashy, so I attempted to adjust the high speed screw. It got worse, until I started backing it down below the normal +3/4 turn. I backed it down to -0- position and it runs great. But what sense does that make??????? I'm afraid to leave it there where it's running good. What would you do?