You dont say if it clears above 1/3rd throttle, if it does than the main is probably ok.
I had a few problems recently,
one was stupid and my own fault so check that the spring clip that holds the needle down is above the needle and that you havent put it in first like i did. This allowed the needle to move up causing some random running.
I then had a few odd problems like you describe, eventually although the bike started and idled fine it had no power and only did about 30 mph. Turned out one of the plugs had died. Reckon its worth trying new plugs if you have them.
I have a had some timing problems and frankly the bike seems to go pretty well what ever the timing is tho obviously not a good idea running with it way off.
Good luck
Nige
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