I have a Stihl something-or-other, and it reliably has the same problem: It will start and run beautifully, then eventually it will no longer start, most likely due to too much oil in the mix, as the easy way to get it going again is to simply pull out the spark plug and hit it with a toothbrush, and then it starts right up again. So my theory is that the mix is condensing in the chamber whenever the engine is turned off long enough to cool, and the volatiles must somehow manage to evaporate, leaving behind a thin coating of oil on the spark gap surfaces, reducing their conductivity and thus ability to spark. However, as I stated previously; easy fix: toothbrush. The problem is, when the toothbrush trick no longer works!!! What's going on? I have probably spent the value of the saw in 'repairs' at the local shop, where they never remember what was wrong with it, they just put a new card-kit on it, and don't mind taking my money again. I believe I have become somewhat of a local joke at my own expense due to this. This problem occurs sometimes quickly, same day, sometimes it may take a week. What is the cause? Many thanks in advance.
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