I am glad you thought of that. I remember drilling out my exhaust hole, on the outside of my can. So maybe the inside of the can that hole is clogged to.

I remember that I tried using this exact same can, onmy 40FP, and it didn't work, I had to lean it out until the needle was almost shut. I tried it on my ST45, I had to lean it out until the needle was almost shut, and on my St90, and I had to lean it out until my needle was almost shut. So maybe the exhaust hole is only partially open.

I build 2 of these can on the same day. I am using 1 on a TT46 and it worked great. But one that I am messing with, I have never got it to work. So maybe there is a problem with the can.

I take the 1 off of my TT46, and try it. that might solve my problem.