I chased this same right hand turn problem for 2 years. It is the adjustment of the control valve. The total adjustment is only about .09 inch total so you really need to move it a tiny bit. To make it easy replace one of the hex head screws with a soc head (allen) cap screw so you can center the spotface area with round head of the screw as a starting point. No need to have the engine running it's too messy. Just do trial and error in tiny amounts.