I would like to see a thread about porting and polishing with lots of pictures for this old fart (my first bike was purchased in 1965). About ten years ago, I discovered the XS650 and I bought a bunch of everything including ten extra engines. I am only now getting around to building the bike of my dreams. I re-phased a flywheel assembly to 270 degrees some years ago and this winter I want to progress. May I have some of your thoughts on porting and polishing?