The link didn't work, but occasional popping back through the intake can be caused by wet ignition, worn distributor bushings causing the points to not stay set, lean mixture, either from the carb too lean, or lack of fuel making it to the carb. Pull the drain plug in the carb bowl, catch the flow, see what you catch. There should be a steady flow, not stopping or slowing to a drip.
A rhythmic popping back through the carb that worsens with load is an indication of a flat exhaust lobe on the cam. Check the motion of the valves, check for broken springs, bent pushrods, valves out of adjustment. A loose valve seat can also cause intermittent valve problems.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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