With all the pseudo hop-up analysis,"Mater of fact" statements going on in another thread,I felt the following link should be re-posted.Some of the lurkers among us, may be unsure with some of those claims presented as fact.These folks might like some alternate general high performance/tuning information to apply to there own engines.
Here is one book,while somewhat dated,is a pretty good "two stroke" treatise.The late author was mostly held in high regard as a tuner/author.
Take a look at the other pdf's on that page too.
You'll prolly need a basic Pdf reader to see it.This is the whole book...free of charge
http://www.edj.net/2stroke/jennings/
Google books also has a nice "free" on-line selection of reading material on this subject,to gain futher prospective.Some are just snippits,some are whole sections.
An example would be:
http://books.google.com/books?lr=&nu...G=Search+Books