This Carbon Steel CEI / BSC tap and die set is the answer to your issues

BSA A7 and A10 (the late 4 spring clutch)

High quality polyurethane fuel line

Or run dual petcocks to your single carburetor

Slimline risers look and work great on any stock or custom motorcycle you can imagine

Translucent Fuel Line - Clear - 1/4 inch ID Subcategory_Handlebar Levers This Carbon Steel CEI /3' of clear translucent fuel line, 1 4" ID, 3 8" OD, perfect fit for your standard petcocks. This piece is enough to cut in half and use for two petcocks with a piece left for a balance tube. High quality polyurethane fuel line, this is very flexible and has excellent fade and abrasion resistance.