Motobecane Mobylette Electrical Gremlins

Responsible Jon /
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My new 78 Motobecane had developed a highspeed miss and backfire, and through trial and error, replacing spark plugs, cleaning points, etc, I realized that the ignition switch/horn is acting really weird. The horn will only buzz at low speed, and if you hold the button in as you accelerate the miss and backfire dissapears completly, and if you let it go, the backfire and miss are instantly back. I've tried putting some carb cleaner and compressed air into the switch to clean it upa bit, but it still does it. Anyone have any bright ideas?

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