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Posted on Nov 15, 2010
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Stihl 420 - continues to cut out , we purchased 4 new saws and have problems with all of them. We thought it must be gas , ethanol, vapor lock any suggestions

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Kiltnar

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  • Posted on Mar 30, 2011
Kiltnar
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If the unit is running for a short amount of time but never gets to a high rpm then it could be that the needle is sticking open, or another carburetor problem. Might also blow the fuel tank completely dry, I have seen where the water would stay in the fuel tank even after it has been drained out. And when the tank is empty I would check the fuel filter. Take the fuel filter off of the fuel line and dry it off. IF the fuel filter is dark, like a coffee stain on white, then you need to replace the fuel filter. If it is a white color when dry the fuel filter is O.K. and the problem is elsewhere.
I would also suggest that you take it to a Stihl dealer that has a Gold Certified Technician, the technician will be able to diagnose and fix the problem. Usually in a timely manner. You can go tot the dealer that you bought the units from or you can go to the Stihl website and they can direct you to the nearest dealer.

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