There is an adjuster screw for setting the tickover, and to the left of this there should be a screw for the mixture, but on this bike there ainĀ“t. I have a feeling that the carb is made to run rich to hold down the power a bit, but it is doing more than this. Can you ask about and see if anyone knows if my theory is correct as I am getting short on the temper front with the bike. It may have to go in PX for an R6!!!!!!!!!!