Hello Will,

Here is an interesting article detailing the "Squish Action". It details many aspects of ignition variables that maybe of useful to you.

http://home.earthlink.net/~scloughn/id21.html

It did not copy and paste well, do to some nice graphics. I tried to post the entire article but it did not paste the drawings required for complete understanding. Give it a look over and tell us if this contains helpful information to resolve your shaking problems.

A second article:

Two stroke compression and head design

http://home.earthlink.net/~scloughn/id16.html

I hope this is helpful.

Kelly