Originally Posted by teambft
Well, tightened the carbs down to the boots. Rode her tonight and it started again with the same symptoms. Thanks for all the advice - will keep digging.
Check your ignition switch. I had the exact same issue and thought it was Mexican gas that was causing it. If the problem is more or less constant look in the HOW for the hotwiring tip, set up the wires ahead of time and install it when it starts. if the issue disappears and never recurs it's the switch.
it's an outside possibility, but the ease of testing would put it at the top of my t-shoot list.