5/16" reed spacer pic

id get the 28mm and see how it lines up and then if theres a clearence problem get a spacer
 
Get a 30mm carb, less money and you will get the better results. You can turn the carb up to a 15 degree angle and still not disturb the floats. You should still adjust the float level on every different carb installed as to where it sits on the engine. And please adjust the carb by the volume of gas it holds.
 
oh ok ill try to get the 30mm carb then

If you guys are talking about oko 30mm they are great but where you connect the gas line to the carb theres not enough room to put a clamp on the gas line which will make it leak gas. So you have to use zip ties.