You can really fuck up a good cylinder with a bad port job. Don't just start hacking away at the ports without any idea as to what you are trying to do. Get the timings on the ports, run some math, read up on all the two stroke tuners books you can find and figure out the best port timings for your pipe of choice. Make some aluminum spacer gaskets to raise the transfer ports to the specific transfer duration you calculated and make sure all the numbers work together (i.e. time it with a measurement wheel attached to the crankshaft) and then fucking rip.