You didn't say what model of bike or the year. If it's a 2003 GSX-R 750 my fan comes on around 225 degrees F. A friend has a 2002 and his comes on at 225 also.
hey guy, your bike might not kick the fan on until about 105 or 106 deg C. My bike usually comes on around 105. If the bike gets to 110, without the fan comming on, then start looking for a problem.