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"5. Has timing set to 15 deg at 1000 RPM."
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I noted the spec timing as well. My experience with the pushrod engines gave me the impression that they'll run fine from 8-20 deg at idle, with more advanced timing promoting smoother running. My plan was to run this engine advanced because of the higher CR I built it with, thus why I started at 15 deg. I will back that off to spec and see what difference it makes.
"I also note now that I can screw the idle screw all the way in and lower the idle to around 800 RPM, but can't completely kill it."
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I will unscrew that idle screw and clean accordingly.
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Another interesting note, the trouble shooting guide in the Greenbooks indicates the first 4 things that should be checked in case of rough idle are:
1. Ignition timing
2. Engine compression
3. Ignition spark at each cylinder
4. Injection at each cylinder
In that order of likelihood. I will go down that list next.
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