Jim Mac,
We have flipped a lot of trikes over the years and we can say for certain that those carbs you speak of are very inconsistent in there Performnce just like you spoke of. I’m no quite sure why that is but my guess would be the internal passages has something to do with it. Stick to a OEM carb and save yourself the aggravation if not today tomorrow. There’s a reason those sell for 24 bucks.
90 nickolson Bored and Stroked "The Good"
Big Bore 110 Pauter frame "The Bad"
90 Bored and Stroked “vey’s frame” "The Ugly"
110 JSC frame Bored and Stroked
flat track build. “Shop trike”
1974 original 90 X 2
1974 Original 70.