Bones, the pump is a "wotyagot" facet automotive (NZ) with a holley regulator (adjustable) behind it, I had done what you suggested and run a Tee in the line, returning to the tank, and it seems to work.
The problem in in the fuel valve (needle and seat) orifice size, which it 3.5mm, totally unsuitable for a pump setup, I see Mikuni list a 1.5 fuel jet, which would "probably" work, but @ $50,,I recon I'll stick with the setup I have for now.
Well, test ride #1 happened as planned this morning, complete with midrange stutter, but a main jet drop helped, so much in fact, she pulled 10g in 4th (the top gear of choice, with a slight overdrive 5th left to "see") which , according to the tach, and gear ratios, is a bees donga over 70 MPH !
Video evidence will be posted when the naked hoop jump is edited out
Ill take a close peek at the workin's before test #2, then try a needle drop, and maybe down to a 150 main, when I can bludge one from fraze.
Arfa toughy Tiny