YAY!Sorted. I made the mistake of looking in the tank and thinking it was all good... but there was a lot of crap I couldn't see (apparently!).
after having cleaned out the carbs three times and it dying after a few minutes it was obvious something was up. Pulled apart the carbs again and as expected, full of crap! Blew out the lines, pulled apart that tap which was now full of crap, and flushed the fuel tank cycling about 10l of fuel through the tank and back out via a gauze strainer.
Bike has since gotten home with a bit of a random cruise, gotten Dale to & from work twice, and myself to work this morning... 140km so far
