Hi all. Having a problem with my 1985 xbr500, when riding on constant throttle it is like a misfire hesitation, normally around 2000 to 3000rpm. So if doing speed limits 20, 30, 40mph it is noticeable, but open the throttle and it will pull strong right to redline and through the box. Have sonic cleaned the carb and fitted new jets. Valve clearance is ok and new plug and cap. Have set the mixture screw to 2 turns to 2 1/2 with no joy.
Going to try it without aircleaner filter tomorrow, if that don't work will try with choke on a bit to see if rich or weak.
Any other ideas.
Thanks Paul