It has to be a secondary thing, because there is no way that a V belt would be able to time a magneto with compression strokes on an ICE engine. It would be firing at undetermined times.
It may still be firing impulses of high voltage electricity, but it's not running an ignition system for an engine. Possibly a high voltage lighting system?
I remember the early snow mobiles, at idle the lights would flicker, and at speed it would appear on constantly.
Got me stumped on this one.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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