Having messed with ports I have come to the conclusion that it would be best to leave well enough alone. Add a 15mm carb, open exhaust and good ignition and see what you get. Compare those numbers to other engines of that size and judge the result. That engine is pretty well respected. I doubt big improvents can be made. On the other hand since you have several sacrificing one may not bother you. Down load a copy of the two stroke tuners guide. Read it several times and get real confused, then go fly. IF you need big power in a small package get a DA-50.