Jon nail it! Lean condition! Blame it on the EPA none adjustable carburetor and the Ethanol fuel..I can't count how many times we need to go one jet size bigger on air cooled motorcycle carburetor to get rid of the overheating problem. The principles of Bernoulli have been establish long before the EPA was born... 
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Gilles.
1988 2072 401 54" hyd angled blade
1988 1872 364 snowblower/C50 deck
1976 1650/QA42A blower/44A deck/standby
1976 1450TS/Sleeve hitch/44A deck/in storage
1963 100 (red)/in storage
2010 Kubota 2380-2/42" infinity deck (engine swap)
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