want to find this filter in red:

It will fit ,and it will help alot with the air flow or lack of that you have now. I ordered a speed carb from spookytooth and it had that kind of filter . Put on my old sbp filter and it really halls,best carb if had . I didnt like the cns or csn whatever it was carb always leaked gas i just couldnt get it lined out right. Put on the other carb and it was smooth and powerful the whole rpm range and didnt sputter at top end...Love it.