My yerfs use these in the fuel enrichment circuit.
judging from what a ballast resisters is used for, I imagine it is inline to keep a steady current to the enrichener . The enrichener is fed with fluctuating current from the stator so this type of resister serve as as a sort of voltage regulator. I would have to assume a steady current is needed to keep the plunger hold in the closed position properly. With a current drop the plunger will open. Just a sophisticated wild ass guess here!
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