My 'shee runs well for about 1/2hr then just stops and wont go till it cools down - what could this be ??

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It maybe Vapor locking. Try looking into a heat shield kit

 

My freinds DS650 did that too, same thing, he just shook it around a little bit and opened up the gas cap let some air in there and she started right back up...

 

Thats my guess too, the gas tank vent isint venting so eventually there is neg pressure in the tank and no more gas will come out.

 

All i can tell you is that theres fuel in the carby - someone told me that coils can go down when they get hot ??

 

Yep, it can be electrical. Next time you go out, have a spare spark plug with you. When the motor quits, pull the plug wire and hook it up to the spare plug, and check for spark. If you have spark...then its a fuel problem.

 

I still think it is a vapor issue. I think you should try the gas cap and try releaving the pressure. Your gas in the carb is vaporizing and locking up the motor. That would be my guess. It is a 660 motor just like the Grizz and that was the same problem the grizz was having