Turn in the idle screw to get it to idle higher. As far as the bogging, trial and error will work soe wonders. Take off the air filter - does it run better. Run it without the filter and cover up part of the intake with your finger as you are riding. Does it run better? If so then you are having an air-fuel mixture problem. I'm having the same problem right now. With the stock filter, it doesn't run very fast. With no filter , it's getting too much air. I have found that one layer of pantyhose over the carb intake and held in place with a rubber band, does the trick nicely. Now if I could only find a filter that approximates this! I guess I could stick with the stock filter and downjet too.