Bert: As far as your ignition problem - I don't know. But, as far as the carburetor - if that carb is totally clean (every tiny passage) and the float level is "dead on" and working, then you have an air leak somewhere. HALF CHOKE = LEAN. It is either where the carb bolts to the manifold, or where the manifold bolts to the head. Crank the M and take it up to mid throttle. While it is running 'rough', spray some WD-40 around the manifold-to-head runners at the head. If it smooths out, you've got an air leak there and you will need to remove the intake and have it planed off smooth at an automotive machine shop, then re-attach it with a new manifold gasket. Or, you may have a cracked manifold. If so, replace. Torque to 70 lbs.
Do you have a gasket between the carb flange and the bottom of the manifold? A good gasket? That is where I would check next for an air leak.
After that, check valve lash. It should be .017" @ hot.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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