So, I have the head off my CGT while I wait for an order from H's. I'll be fitting a new 1 piece exhaust valve. Not that my original was ever a problem but might as well, while the bike's having some down time.
Anyway, with the valves out I see a few areas in the ports that might be improved on. The ports on my head don't have the core shift displayed in the head of another forum member recently. But, the exhaust port has a ring of material, like a donut, raised into the exhaust port downstream of the valve seat, 1, 1.5mm high. That can't be optimal. I'm dremelling that out to make the port smooth. The inlet, there's a sharp transition between the cast port after the valve and where the port has been bored out for the valve seat. So I'll smooth that transition as well.
The big one is shown in the photo here: The inlet port and insulator are badly mismatched. The port is a mm smaller than the insulator, and that mm is offset to one side. The picture will show you what I mean. Before I get stuck in there and remove a load of material to match the port to the insulator, is there any good reason to not do this? THB I've never had any experience porting. I did a 6 cyl head once that worked out well but i was only copying someone else's work.
What do you think, Tom, is it worth the trouble? I can't imagine it doing any harm but thought it's better asking before I ruin it. Thanks