Erratic revving on barn find 1962 cc
any help will be greatly appreciated! when i open full throttle via the dash lever, the magneto lever on the engine that is attached to the butterfly on the carb by a thin rod keeps opening and closing revving erratically while the engine is running. I can only get full throttle if i manually hold the magneto lever and butterfly open. Any suggestions? I have tried playing with the 2 screws on the carb with no luck.
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