anyone have step by step photos of engine porting or know where I can go to see some photos?
I found this page and kind of understand what I'm lookin at but I have also read about porting and I think what I have read and what I see are two differet ways of proting..
I'm not looking to do a spacific engine at this time just looking for knowledge.
Bugs

I had a Clarence Lee engine book..Vol. III. Can't remember the name, I gave it to a guy. That's where I learned about degrees of duration and all that.

All I do is alter the timing. I looked at the link you provided and I have to say I have never had anything but disappointment from removing metal from the inside of the engine. This increases the volume of the case, and that is bad. The piston can only displace a certain volume on the downstroke..if you increase the volume of the case you can't get a full charge into the combustion chamber and the charge velocity goes down as well.

The main drawback to altering the durations of the engine is then you have to use a tuned exhaust. Most people looking to increase performance already run tuned exhaust since that's the easiest way to get power, so that may not be a problem.

I've done a bunch of engines and only had 2 that I made worse..both of them were porting changes that increased the case volume.

I've never thot about altering the stroke durations, but I have thot about "porting" the pistion and sleeve, in line with a sneurle (sp?) porting chamber. That way the fuel/air mixture would start entering the combustion chamber (opposite side), on the down stroke, even before the exhaust port opened. Just a thot.
Never tried it though

I've done this and the duration of my engine was limited,engine lasted 6 month's, but I gave the connecting rod some aerodynamic shape and got some increse in RPM don't know how much cause I never tach. it but I know it was working case I could here the increse in RPM.

There is a lot of pressure in the cyl. before the ex port opens. If you raise the transfer ports above the ex port the ex pressure goes into the crankcase. Not good.

The tolerences on those little suckers are so minute, I have seen so many junked in the rc car department. Tuned pipe, change the compression by removing head shims or using thinner ones, more nitro. Knife edge the rod to cut through the fuel cleaner also helps.
If your going to break out the dremel I'll include a link, just try not to change the size of the ports, just make them cleaner, more angled on the out side. Good Luck.
I find the best way to port a 25 is by buying a 32 piston and sleeves cost almost as much as engines....figure that one out.

http://www.nascart.com/nitrom.htm

other kinds of 2strokes work like so -=--ehhaust MUST open first
allports should open with a square edge for pulse tuning.
So squareup the opening edge of the crank/carb (both case crank.
then to do cylinder mark the ports edges on the piston top .
Then wih it out mark a line 1/32" down the side of the piston--
scribe a circle at about 1/3 radius tn from the edge.. This will give u an outlie of where to file a trence in the piston top .
A trench changes the ports affecyed also & u can see what yr dooing...slight loss of compression ratio ..more nitro