I had my head off of my honda elite 250 and also got a new dremel tool. I cleaned up the ports on it too. Inside of the ports was very rough. A seam even existed in there. It was like a speedbump for the gas and air mixture I bet. I ground all that down and made it as ssmooth and shiny as possible. I didn't want to get carried away so I left it at that. I'm hoping the smoothness makes a difference in how it runs and performs.
Re: Porting an engine
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