Hi to all ... looking for some advise on my rs125 it being a cnut, it will run fine with the choke on and pull ok but when I turn the choke off it hard to pull away with no power, as if the bikes struggling for fuel but fuel flow to the carb is good and the carb is all clean as well as filters and jets

I've tried adjusting the air mixture and this has no apparent effect on the running of the bike ... so im at the conclusion the piston rings are worn, I've only had this bike for 3 months and has been like this since, just to add the carb is delorto phpbh28.

Any thoughts appreciated b3.