I have a couple and they're both stock besides simple muffler mods. They tune differently despite both having Bing carbs--- the one I use for noodling I like around 12,600 with a good 4-stroke. The other is 13ish. Both sound ok and could go leaner.
Not sure on that one except that it's below the limiter on the cdic models. Conservative tune, probably saved quite a few saws from being "on the edge."
Also I had the tach on my 064 today after replacing the af. I put an AM white pleated one on it in place of the hd. I'm comfy at 12,200 til I get a chance to re-tune it in wood. It'll probably be closer to 13,000 after that-- slight mm, 28" bar.
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