I have a 1975 K321 on a Case 222. It starts great, idles well, but
stalls out when you try to get mid to full throttle. Carb is cleaned,
fuel is good. Any ideas would be appreciated. No smoke, idles strong.
Most probably dirt in main-jet, or main mixture too lean/rich.
Else, likely problem is one of many possible w/ignition (timing,
advance (a/a), contact resistance/pitting, open plug resistor(s), coil
tracking, yada, yada.)
Various books are available on small-engine repair.
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