Well first, unless your Kohler is a K-series or a Magnum, its not a 1/4" bolt, its metric.
Second, that bolt is probably self-threading and somewhat harder than a normal bolt.
Third, you are not alone. That same thing happens to me when I work on those engines at least once a year. Those fasteners tend to seize in the head. I bet you backed it out about 1-1/2 turns, then it broke. What happened is a bit of aluminum froze to the threads of the bolt and wedged tight as it backed out.
While you can try heat-like from a propane torch, not acetyline, your best bet is to just drill it out, run a tap in the hole, and put a new bolt in.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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