Does anybody know if Harley do a 5/8 port brake master cylinder for the front, if so do you know what the P/N for this

Since putting 6 pot calipers on the front the brake lever is alot harder to work to pull up compared to stock. I was thinkin maybe a bigger port would fix this issue.

They do a 11/16 but they are for the tourers which have twin discs on them

if you are saying that the 9/16 m/cyl is too firm, it will only get firmer with 5/8
thats why hd went to 9/16, to reduce lever effort (while adding a little travel by default)