I don't know if your carb has a throttle needle with notches on.
I used to be at 9,000 ft at my last base and the bikes we had all ran rough until we dropped the needles down to the last notch which had the effect of weekening the mixture. We also did this on our motocrossers for raceing but you have to do it all again when you come down to sea level.
Ducati 600 monsters,CR 250,RM 250,CR500 etc.
Cheers
Ian
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