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50racer is right. Most places these days dont own flow benches, and if they do they would charge ungodly amounts of $$$$$ to port your head. A real port job can take a few weeks if the person really knows what they are doing. (this mainly has to do with car heads but should cross over into the 50's) No one I know does polishing anymore as xr50racer stated. It can actually cause undesirable affects. The furthest I would go is to maybe clean up the intake and exhaust ports, port match them, but dont touch the combustion chamber. You can actually lower your compression and make the bike even slower. Reverse of what you were looking for. But honestly in my opinion, if you can afford to have someone else do this or buy an already ported head go that way. You might just save yourself the trouble .........
 
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