Kz440 Cylinder head - seeking advice/help

Hi everyone!
I’m new here, and in the moto world! I have a KZ440D 1983, her name is Blaise and she’s my first bike. I decided to take on the top end rebuild myself. And I also want to customize her, so lockdown is pretty much the perfect time to do it. Now, taking her apart was fairly easy, but since I don’t know much about bikes, I found out today that the cylinder head does not look as it should. The valve seats look pretty shitty, I cleaned up one exhaust valve and when I went to take out the other, I couldn’t and noticed it was beat up on the top of the stem. My question is can this head be helped, what would be the best way to tackle this “problem” and what should my next step be? I attached the photos of the valve, the steam (that’s beat up) and the exhaust seat. I would appreciate any help/advice possible! Help a girl out!

Your best option is to take it to a a machinist who works on motorcycles.


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I agree that paying a pro is the ideal situation. 2nd best option is to clean all the carbon off via soda blasting or mechanical means and then assess the extent of the wear. The valves can be ground to clean up the sealing face and stem, and the valve seats can be cleaned up via lapping once the valves are done. This is no guarantee that everything will be hunky dory afterwards, but it's worth a try if money is tight.

Hey guys! Thanks for your input!
I tried lapping and cleaning of the valves, but the seats and valves still don’t look proper and was told it probably needs recutting. So I’ll be taking the head, valves, pistons and the cylinder jug to a machinist and go from there

As Neber_Rex said, be sure to use a machinist that is experienced with motorcycle heads, and that he or she will carefully check the valve stem height, and tip them as necessary.