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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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