Sounds are deceptive. When I lost spark from dead coil AND magento (long pedal home) it sounded like engine was running. Simply turning over and opening/closing intake/exhaust ports gives a sound very much like it's actually running.
I'd recommend the nerdy neighbor kid who adores you, and who thinks motorbikes are the only way possible to escape his world...show him how to pop the clutch while pedalling, and make sure he understands how important it is to hang on to that spark plug wire end to validate test for spark!!!! Make up something half-believable, like a spark is dependent on weight and momentum, so you need someone light to check for "light spark".