I decided to rebuild a 1974 Troy-bilt tiller for my brother. After reassembly and rebuilding the carb on the tecumseh HH70 cast iron engine, I am stumped. The engine starts great, and revs up when I manually operate the throttle shaft. The Troy-bilt throttle cable goes to a lever on the throttle block, and operating the lever doesn't increase engine speed at all. I have enclosed a picture of the linkages (disregard the little spring I attached to experiment). When the handlebar mounted cable doesn't connect directly to the carb---what increases the engine speed ? thanks.
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