stewmills
Serious Thumper
   
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Imagination is more important than knowledge
Posts: 2646
Auburn, AL
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I am a fan of the stock petcock as well and keep a rebuild kit in my bike tool set. That said, I used to have issues with the bike dying after I would come to a stop after a long, downhill deceleration with the engine idling and not engine braking whereas the engine was still firing at higher RPMs and burning the excess fuel (rich condition, I'm getting to that). After a lot of trial and error I isolated my issue to having raised the carb needle too much and causing a slightly rich condition in that cruise area of the carburetor. So, after cruising at speeds then dropping to idle immediately while coasting the fuel built up and then kaput. Upon an eventual restart it was a big puff of dark smoke which is an obvious sign of being rich. Lowered the needle a little and problem solved.
Not sure this is your issue. Test one thing at a time. It is possible the coil or plug is getting too hot and faulting, especially if you have any mods, have moved things around, or have anything impeding air flow to things that need it, to include the rectifier under the seat that people often cover up with "under the seat" saddle bags.
A new plug is really cheap and an easy item to eliminate next time you have the tank off.
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