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Vintage Sears Garden Tractors

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Vintage Sears Garden Tractors
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Onan engine rpm

Hello to sears tractor lovers.I need to know if the
older cast iron Onan CCK 16HP twin cylinder engines that have a max rpm of 1800 would be a suitable engine for mowing with in a sears tractor such as the
ST16.I've found one for sell,but am hesitant because
of the lower operating rpm.Most of the sears engines
turn at 34 to 3600 rpm.Anybody got opinions on this!