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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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