I think the 321 was a different engine than the 301 (12HP). I thought there was basically four engines in the K series, the 4 HP K 91, than the 141, 161 and 181 (6-8HP) were basically the same engine, the 241 and 301 (10 and 12HP) and the 321, I may be wrong and I am away from home so I can't refer to the parts manual. All the prefixes and suffixes and their meaning are listed in the master parts manual. IIRC the S means it is electric start. The parts manual also gives some definition to the various spec numbers.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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