I hesitated posting on this originally but now I'm bored and I'll chip in my 2 cents. Basically 2 stroke theory is really cool and there is a lot of good information out there. The problem is, knowing theory and being able to port your own cylinder are worlds apart.
Racelogic sells premade templates to port your cylinder but I only know a handful of people that have done it. First you have to get your guts up to not only rip the engine apart but also to take a grinder to your perfectly good cylinder. Then you actually have to have the tools required to put a grinder on your cylinder... that alone means you need some kind of grinder with an extension to fit through the port, the correct bits, appropriate file to chamfer the edges, and then you need a hone to finish it off. If you don't own the tools you'd have to spend $100-$200 depending on quality. Then you'd need the information to accomplish a port job so templates can be bought for $100 or buy a few good books $75-$125. Then use some guess work to port your cylinder based on what you learned and HOPE you did it right...or you could just send it away to x-scream, paul lehr, or one of the other reputable shops and have them give you SWEET port job that is exactly what you want and pay around $300. It's a no brainer...
okey:
I ported my cylinder but I already had the tools and my only real expense was the porting templates. I read all I could to avoid buying the templates but I wasn't confident enough to risk messing up my cylinder.