I think your running slightly rich. If you have leaks you'd be running leaning. But do check anyway. For the mixture screw, turn it just a 1/4 at a time and listen to the idle. I like to find where it first starts to drop, then turn it back out by an 1/8 or so. Remember, clockwise lean, counter clockwise rich for the stock cv carb. The bike must be warmed up to find the right tuning. Ride for 10 to 20 minutes. Adjust. Then go fr a test ride. If needed increase the idle with the idle screw.