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@Jung
So my XR is working again - after rebuilding the carb for the 4th bloody time. It got the full ultrasonic treatment along with all new jets, seals and everything else down to a new float bowl. Good news is that it runs great, definitely a crisper throttle response and it ticks over properly too. The odd thing is that the pilot air screw does almost exactly nothing.... I can only think that it's because the slow jet has been bumped up so much it just doesn't make enough difference to affect it?
I'll do a bit more commuting this week before I pronounce it fixed.