Have adjusted carb after cleaning, idled extremely high after carb cleaning turned down idle screw and it turnied down to roughly 1500 to 1800 rpm. When i took it for a run RPM's seemed very high for half throttle scared to give it any more. When stopped and left at idle wasn't were i had adjusted to seemed high again. Sprayed cleaner in all obvious spots intake boots crank seals etc no leak. My question is were is a good starting point to adjust carb at air screw in particular and throttle cable for needle adjust. Again any help appreciated.