The sputter is the gas in the carb boiling from the heat that gets to it when you stop, kinda like vapor lock, running the fan while stopped will not really help in this situation, only air flow when you are moving takes care of this. I have had the same thing happen to mine an 04. The engine light for heat never comes on so its not overheating, it just a carb thing that happens when its sitting for a break in riding. The only way I know of to cure the problem is to run it without the side covers on, that will let more cooling air circulate around the carb area and get rid of the heat.I have only had it happen a couple of times in 3300 miles of riding so I just ignore it. Just so I didn't misread your post, your engine isn't overheating right, it just the sputter that happens right after a short break on the trail and just for a few moments after you start moving. Only happens on very hot days while slow trail riding.