As I wrote earlier, I used CBX750 cylinder head and camshafts in this my Honda Cb750 Seven Fifty cafe-racer project. And even as all components were checked and turned out to be in sound condition, still there were a lot of work to do. Thirty years old carbon deposits with their deepest mostly fossilized layers could be hard to remove. And to be honest, sometimes I think Honda have been used sand casting technologies up until now… CBX750 cylinder head has sixteen valves, so channels are tight and intake channels are awfully deep in addition.
But I used to this kind of work, so I did rather cleaning than porting work to cylinder head channels, cleaned valves and won the battle for unscrewing exhaust studs. After it was finished I gave cylinder head and valves to the special machining shop which specializes on cylinder boring and cylinder head components works.
I ordered cylinder head surface grinding, valve seats refacing and valve face machining. May be that’s not the best cylinder head work I have ever done, but anyhow, after my efforts and machining all parts looked much better than before:-)