I thought I had this finished but there are still issues. What I did so far is I took of the carb, took it apart, soaked it in parts cleaner, and blew out all the channels. I put it back together, installed it, and got it running. I have experimented with the needle adjustments, and it seemed to run OK by backing out each one 1 and a half turns. By the way, why are there two needle valves and which does what? One is a little longer than the other. The shorter one had markings on the housing where it fits in that say L and H, so I take it that means Low and High. There are also two gas hoses into this and I wondered why two? Today, I went out to put the plastic cover back over the carb area and there was gas in there. The throat of the carb wasn't flooded, so there must be gas leaking out around a connection, but where? Also, there was a few drops of oil dripping from the low spot on the muffler. It also wouldn't start without very much effort. I know the oil/gas mixture is right. I also put in a new spark plug even though the old one looked fine. I was wondering if the two rubber gaskets that have some apparent function need replaced. They would be old too. But where to find them when the machine is 20 years old and the company was bought out by Ryobi since then?