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Man, am I glad to have found this thread and its predecessor.  My Yager did the same thing two weeks ago.  No indication of any problems, then it wouldn't start, then it wouldn't stop trying even with the key out or the stand down.  My dealer here in Austin was flummoxed by the symptoms and even thought someone had reversed two wires connected to the starter. Kymco told them my warranty couldn't cover the problem.

I copied these threads to the dealer who passed them on to Kymco and, voila, they'll be replacing the starter and the battery, as well.  Thanks to Brian at TJ's Cycle for his persistence.  And thanks, Forest Grump, for this thread describing the problem and solution!

I've got about 1100 on my Yager and love it - but now I have a mystery problem.

Last week, on a 70 degree day, I rode about 5 miles.  It did not start without some throttle, which seems to happen sometimes, but ran fine for a while.  Then, I noticed a bit of hesitation while riding when I released the throttle.  Finally, it was incapable of keeping the engine alive without throttle.  I let the engine cool a few minutes, but the problem didn't resolve.  I was less than 1/2 a mile from home, so I rode it home, trying to keep the throttle open even when stopping, but letting it just die a couple of times.  My dealer here in Austin isn't too far, but I didn't want to try that exercise in traffic.

The next morning, before the dealer came to pick it up, the damn thing started right up and idled nicely.  I didn't have time to ride it, and they trailered it in for service.

Since then, the dealer has been unable to replicate the problem.  The mechanic said that, when he first started it up, there was a patterned flash in the service light, but that has not returned either for him to read what it was indicating.  They've ridden it a good bit and just cannot get the issue to return.  Fluids and all the regular maintenance things checked out fine.

Friday, they were going to just bring the bike back to me.  But, having been nearly stranded close to home once, that doesn't work for me.  I take some long rides and a bike that cannot idle is not safe.  Not only that, but the dealer suggested this service might not be covered by the warranty!  A nearly new vehicle that fails at the basic task of running - that's a warranty problem in my book. 

Any suggestions as to a potential source of or solution to the problem?  My dealer seems to view the Kymco's as a sideline to his real business and doesn't seem to inclined to deal with me, so it would be great to be able to provide some guidance.  Thanks.