Hmmm... well I would contact Bing directly, there still around.
It sure would help your situation to find jets.
Here is a link that has helped me identify weird stuff on small engines but I went through it and found nothing but maybe closer study will be fruitful.
http://www.myronsmopeds.com/category/carburetor/bing/
Just an FYI it isnt too hard to modify squish band to help with the detonation there are a couple things that need to be done to do it right but it does cost $$ and budget is ALWAYS the limiting factor. It does make a huge improvement IMHO. I have done it to all the 2 strokes I have if the squish area is above 1.5mm and on most older 2 stroke engines more like 2 to 4 mm which is WAY to big for todays fuels. But again you can jet and/or retrard the timing your way out of it too.
You will read alot of stuff on squish band and it makes it all mysterious and such, but its not, tighter squish better burn, detno happens at the edges of the combustion process so speed up the edges of the combustion gasses by limiting the space they have avalible to them. Biggest problem is correcting the CR ratio so as not to raise it to high. All the stuff about burn rate and which is better for high rpm or better for low rpm is a bit of hype, most seroius 2 stroke tuners want it as tight as they can get and always have from way back inthe 60's. The factorys left them loose because it was easier to manufacture and the fuels then where leaded high octane and they worked fine with it.
Sometimes its as simple as running no head gasket and sealing the surfaces with silicone if they are flat enough. You can check them on a piece of thick glass, if there flat seal it with good high temp silicone then let it set, then check the CR and hope for nothing above 145-150psi, if its to high go back to the gasket. If its fine run it and for the first few heat cycles make sure you retorque the head.