Glad to hear that, everyone on here was saying to use either a 24 or 26 to get the most outuse the 20mm carb. A 24mm carb will forever be problematic off-throttle unless the carb is an MJN24. The best running 108 I've every done had a mikuni VM20 on top .
I didn't think it would fit , what I thought was a 20mm carb on it now turns out to be a 19 mm, its pretty tight but it fits nicely , I see from your picture that a ShengWay 20mm will really be a snug fit , I kinda like the way the 19mm fits, I'm thinking about doing a 108 stroker, what would your opinion be if I stuck with the 19mm on a stroker ? Might not be worth doing if I can't fit a proper carburetor . ThanksI inserted a 1" x 1" piece of wood under the rear tank mount on my '69 hardtail to use the TB Parts 20mm carb and manifold. I also used a TB Parts petcock with the 90° outlet so it would (just barely) clear the UNI filter. If you were intending to use the TB Parts 24mm carb it will not fit, it is taller and a little wider than the 20mm carb in the pic HERE. You can see that there is no heatstop, using it would have pushed the filter up into the petcock.
Great , I ordered one couple days ago hoping it's a shorter profile to fit under the tank, from the pictures i seen it looks like it's shorter and from your pictures it looks like it might work out for me ( did you raise your tank with the PZ22 ? ) and also what's a good starting point for a main jet on a 20 and 22. ThanksI swapped in a different engine/carb setup than the one above, it is a "small block stroker" engine with a 48mm bore and TB Parts 51mm stroker crank, and I tried out a Molkt PZ22 carb for fitment. I ordered it from Amazon seller XLJOY for around $25 or so. It takes genuine Keihin jets and seems to work real well with the TB Parts manifold. You can see how it sits in this pic
Did you have to raise your tank with the PZ22 ? ThanksMy 20mm settings are similar to 66Cooper's- 90-92 main , 38-40 pilot, 4th needle position from the top, and 1.5 to 1.75 turns OUT. For the PZ22 that came with a 75 main and 35 pilot, I went up to an 82 main and a 40 pilot and the 4th position for the needle clip.
The same air screw settings and adjustments, as well, with a 1/4-turn IN at a time to fine tune it