I'm not an expert but have ridden and worked on quads for about 16yrs. so I hope no offense is taken at this, If you don't know all about how to port a 2-stroke for the powerband you want, know about port-timing, transfer ports, how intake ports flow at different RPM's let someone that has the experience and the proper tools do it for you. Most people think that if you just smooth everything out in the cylinder it is ported, not so. You can change the power band drastically by porting if you know how, i.e more bottom or more top end. Eric Gorr is a well known 2-stroke guru and when he did mine he asked me all kinds of questions about my mods, how I ride, and what I want out of it and delivered exactly what I was looking for. Get it done by a reputable builder!