Harold, that is one really long article, but its got a lot of info in it. It's interesting to note they recommend polishing the entire combustion chamber, to include the valve faces and piston tops, something I did on my racing bike engines way back in the 60s, I even polished the exposed valve stems down to the seating area. My reasoning for that was to reflect the heat and increase flame propagation. I got that idea from watching an old Mickey Rooney movie on Thomas Edison. The scene was where his mother was ill and needed an operation, but the doctor claimed he couldn't do it because of insufficient light. Mickey, AKA Thomas Edison as a youngster placed numerous kerosene lanterns between mirrors and the reflected light was more than enuff for the doctor to do the operation and save Thomas' mother. So, based on that idea, that worked BTW, I mirror polished all my engine combustion chambers. I don't really know if it was sucessful, but with some gearing changes I was able to change my top speed from 55 MPH to 70 MPH on my old Honda 90 CC bike. Of course there were other things added to the engine as well, like a cam, intake/carb/port matching, mirror polishing of the exhaust and intake ports, normal stuff for back then. The general consensus was the engine was turning close to 11,000 RPM with a 13-70 final drive. To think I was on to something way back then is unreal. But then again, I had adjustable pneudraulic front forks on my bikes back then too when everyone else had springs in theirs. :yup: