Posted by t.r.k. on January 01, 2021 at 18:05:57 from (71.31.64.233):
In Reply to: Stihl chainsaws posted by Illinois Deere on January 01, 2021 at 10:12:12:
I don't work for a Stihl dealer, but I do work on a fair number of those saws in a year at the Echo and Husqvarna dealer. The fuel mix ratio itself is not the problem, as long as it is pretty close to 50:1. (And not more than a month old. Modern fuel does go old pretty quickly.)
The real problem with those MS170 saws is the carburetor is jetted for the fuel mix to meet Federal Emissions and the fuel delivery cannot be made any richer. At least not without modifying the carburetor. So the saw runs lean and with a lean fuel mix there is both not enough fuel keeping it cool or enough oil to lubricate it properly. When a saw comes across my bench and I know it needs 'just a tad bit more fuel' I have to tell the customer their saw needs a new carburetor.
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