Try this......run the bike until it quits. Bring what you need to drain the float bowl out. Re-seat the drain screw and attempt to restart it. May be a floater in there that interferes with the main jet. Humor me. Crap gathers in that bowl, and vibration, motion, jostling, stirs up the mix, and all it takes is a fleck to block the main jet. When you drain it, look for little sand grain sized black particles.
You may have an electrical / electronics issue. My experience has been that when components go, they go. The one component that will create a intermittent cut out is the CDI. But typically, they don't restart as you describe. Which makes me think fuel delivery related.
EDIT: Drag along a can of starting fluid. After draining the float bowl and attempting to start it, if it does not fire, [you'll need to crank it a bit to pump fuel back into the bowl] open the air box and shoot some starter fluid in as you crank it. If it fires, you have a fuel blockage. A one second burst is all you'll need.
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
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Last edited by vatrader; 09-12-2010 at 10:02 PM.
Reason: Added content