Porting is not really all that hard, but it does require extensive knowledge of two stroke theory and a very steady hand. Anyone can go in and clean out all the ports. Just go in and kind of just smooth everything over. All you will gain from this is just some throttle response and maybe alittle horse power. A true port job consists of changing the port timing, angles , and shapes. By raising the port heights you will effectively change where your power is, late early mid. The transfers pretty much control when the power will come on, it shift you from right ot left or vice versa. Port widths are also important. Wide is good, to an extent, you dont want too much fuel in the cylinder at certain times for certain applications. There are formulas which govern the demensions that the ports should be for particular applications. If you dont know how high and wide to go, then you will ruin cylinders more than likely. What seperated a good porter from one who just knows the numbers are the angles that he creates to direct the flow up annd throught hwe ports. This takkes lots of experience and reasearch. Macdizzy does have a very nice site. The talk about triangles and all that crap, is unknown to me. I have no idea what that is about. Dont go cutting on your cylinders if you dont know PRECISELY what to do. DO NOT listen to the people on this site who make it sound so easy and they dont have a clue. My sugestion to you is to read up on it, deecide what you want to do, and do stuff one step at a time. A set of cylinders take an experienced porter 12-18 hours to complete, if he does it right. Prepare yourself for a job. Never go into the job and just do it as you go, have a plan.