Riding mower will not start

It has fresh gas, newish plug, fresh filters for the air, oil and fuel. I parked it in the garage after mowing a quarter acre hill and the next week it simply would not start. The starter works, it just will not turn over. It is getting fuel. The linkage moves freely. The battery (and the filters) is new from last Sept. The wires appear to have clean connections... I'm lost on this, please help ^_^
It is an older Craftsman with a 15.5 B&S engine. edited to add: Whoops! thats a Kohler engine!

This message was edited Jul 11, 2009 3:02 PM