I'll try to reply to all 4(!) suggestions above...
1) I realize cylinder #2 may not have perfect compression as it's the one that chewed up the exhaust valve (and now has the custom threaded insert) but cylinders 1 & 3 should still be good so wouldn't it at least fire on them?
2) I think the spark is adequate - if I advance or retard the timing I occasionally get backfires thru the exhaust or carb but it never fires when it should - at TDC or just before TDC - and acts like it wants to start.
3) The plugs were new a couple of years ago and all 3 show a spark when removed and grounded. The firing order matches the valve action and yes, with 24V to the starter it cranks rather fast.
4) Yes, the firing order is 1,3,2 - verified by the manual and watching the valves open and close.
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