Re: BST36SS carb issues
+1. Don't bother with the OE unit, it is marginal at best.
Pingel all the way, the double outlet is easier to fit, but more expensive. I fitted a single outlet to mine, with a T then 2 additional fuel filters nestled between each carb pair, above the fuel inlets.
Also, test the tank vent, do you get the same problem if the cap is left just open? Do not do this with a full tank!