What's everyone set the there Spark Plug Gap at?

I've got mine gaped at .013 in my full mod 29.5. I've also been told between .015 & .017. I think it would boil down to whatever a particular motor likes with it's setup.

... The no-word answer; .015".

The "novel"; The ability for an ignition system to fire a plug reliably at 20K RPM is dependent on good components, and enough time for the secondary coil to saturate ( re-load if you will ) sufficiently to fire the gap, cycle after cycle. Most of the ignition systems we like to think of as great for our "racing engines", were and still are, designed for garden engines running about 10K. There is plenty of time for a secondary coil to saturate and fire a .020 to .025" gap at those garden speeds. Because they are CD units, they fire a strong, very short duration spark. To me, we have a much better chance of hitting it every cycle at twice the designed RPM, if we reduce the gap to something that is less taxing on the coil.
Even with a "state of the art" ignition like the Power Spark, we run .015" gap when using the conventional plugs. It performs flawlessly on standard secondary coils.

Does not seem to matter on my Zens but RCMK like. .015 so I just set them all there.