I got spark! Once...
The last couple months I've been trying to get my 1976 Honda MT125 to spark. I has a new coil, new spark plugs, and I set the gap to factory spec. No spark. But then, I widened the gap, and it sparked once and I haven't been able make it spark again. The spark was blue.
Sure it's quiet, for a diesel. But that's like being well-behaved... for a murderer.