Useful articles for two stroke engines:
1) Ignition Timing by Bill Unger.
2) Bike myths.
3) Basic 2 stroke Tuning by Eric Gorr.
4) The Art of Squishing things until they give power by Dale Alexander.
5) More power to the Air-Cooled RD by David Freist.
6) Torque and Horsepower by Bruce Augenstein.