Live and learn. My Permagreen Ultra has about 1000 hours. Throttle sticky sometimes idles too fast. I ordered new springs, three altogether. Still problems so i ordered a new carb, (47 dollars). Bill at Permagreen sent it and it arrived in 20 hours. Delighted. He also sent (as requested) diagram and photo of how to hook up springs. Photocopy of photos was a little fuzzy. I installed new carb and it ran great in 40 minutes. But sometimes idled to fast. Took a few photos. Needed 5/16 and 3/8 nutdrivers. However there was a spring left over. It is very small, the coiled part is about a quarter inch long with straight paperclip-like wire coming off one end. From the diagram he sent, I suspect it may be the governor idle spring. And the diagram mentions how you should bend the governor idle spring tang to obtain 1750 rpm. Where is this "spring tang" and does the spring hook to the tang? If not where?