Guys,
I had some time on my hands while traveling and started hunting around the net for porting information on two stroke engines and came across this site:

http://www.2t-special.it/libri/(engines)-The_Basic_Design_of_Two-Stroke_Engines.pdf?bcsi_scan_fd86d3dd427d821e=0&bcsi_scan_filename=(engines)%20-%20The%20Basic%20Design%20of%20Two-Stroke%20Engines.pdf

It is a scan of the Gorden Blair book and has lots of information on all kinds of design features, most of which don't apply to stunt but if you are into the details of how these things work this is for you. Enjoy.

Best,   DennisT