I think this thing is about a 2000, if they still made them then? It wouldn't develop rpm. So, I cleaned up the carb & re-adjusted the carb. That includes cleaning the gas filter. It gets the revs now, but it idles so high that it is always in gear. It has a centrifigal clutch. I thought I was a mechanic but I can't figure out how to lower the idle. Help please. Thank you in advance, HF.