Mg what brand of cylinder is that? Plating sure looks pretty good lowers & uppers just have the casting flash removed?on the intake and exhaust what changes were made? Did you widen if so how much raise or lower the ports? Squish or base been modified at all? We like to hear about what was done. What do you use for porting tools? Myself i use a dremmel and flex shaft. 95% of my porting experience has come from porting pwcs and bikes/atvs. These saw cylinders are so dang small it makes for a very hard time to move the ports much with my big hands anda dremmel. The small ones less then 48mm are difficult for me to do much on the uppers or lowers. So im usually very happy to have a cylinder with transfer covers. Sometimes i wish all saws had covers as novice like me can really do some precision directional and flow work .