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PCN Ryobi on continuous high rev - Not caused by idle screw?

My Ryobi PCN 4545 18" petrol chainsaw continues to run on high rev upon starting. The idle screw is backed all the way off so is not the cause.

Can you please tell how can this be corrected and prevented from reoccurring?
Pat Meehan, July 2010
link Click here to see other fixes for Ryobi PCN4545.