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Hi Bob - Honestly, I didn't run it long enough to answer the question about smoke. I just did the upside-down thing, then put it back together and got it to start. Ran for like 2 seconds, then died (because it was still cold). It hadn't been sitting a real long time - maybe a few weeks or so.

Well...I got it working (though I'm not sure how). I looked at Bob's suggestions a little more closely, and I pulled the cord with the saw *upside down* as he suggested. Before this, I was doing the same thing but with the saw on end, not upside down. Still nothing came out of the plug hole...

What I don't understand is, if it's hydraulic locking, why doesn't removing the spark plug and pulling the cord several times fix this? Shouldn't turning the engine over a few times clear any areas that might be locked?

When I remove the plug, it looks fine (not wet). No fuel mix comes from the plug hole when I turn the saw over. And I'm using ethanol-free fuel for just the reasons you cited.

Hi Bob - so, what is the remedy for this?

Hi Ronie - Yes, that's it - with the spark plug installed, it's essentially impossible to pull the cord. This was true with the muffler off, so I don't think the problem is on the exhaust side. The piston and cylinder looked OK (as far as I could tell); like I said, with the plug out, it's...

Hi all - I was given a Stihl 025 a few years ago by some aging neighbors. First thing I did was take it to a Stihl dealer for a look-at and fix-up. Since then it's run fine, though occasionally hard to start. This last weekend, though, it went from hard to impossible. Looking at some tips, I...