small issue

Hi to everyone, this is my first post and I'm asking for help.
I have completely rebuilt my M750 into a cafe racer. The small issue im having is it stutters when in top gear around 65mph. Everything electrical is new and it revs as it should in all other gears. I think its a fueling issue. Has anyone removed the vacuum type fuel pump and fitted a electric pump, if so which one have you used ?

Any thoughts would be greatly received