New Stihl ms 180 purchased in Nov 2008 and was used once in January 2009 for approximately 40 minutes before not being able to rev up. It starts easily and idles fine but will not rev up. Replaced the spark plug and checked the fuel filter. Dealer where I purchased this saw charged me $20 for a tune-up. The saw ran for 5 minutes while cutting down a small tree before doing the same thing again. I tried openig the fuel tank to see if venting could be problem but this had no effect.
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