My next task with cylinder head was to prepare it for glass beads blasting. Why to bother with blasting if head is new? For one thing, 1980 KZ750 cylinder head is factory painted. The shade of silver paint is mostly completely corresponds those of bare head. However, when one wipe cooling ribs with rag soaked in carburetor cleaner one may see traces of paint on rag. Another reason is that media blasting is the only way to be sure that paint will be applied on bare and non oxidized aluminum.
But danger of media blasting is media itself that in case of cylinder head with its blind ends of oil channels may cause havoc if even remains of it were left in some corner inside. So when I pack cylinder head for glass beads blasting I pack it tight. I pack all valve tappets’ wells with rags and closed all oil channels on upper side of head with paper tape. Then I sealed upper end of cylinder head with paper tape. I used old camshaft end plugs and I didn’t forget to seal tachometer port with piece of fuel hose with bolt in it.
Usually I use original valve cover as upon cardboard gasket, but configuration of KZ650-KZ750 valve cover may complicate the work of blaster, so I made cover from plastic I had at hand (some kind of monolithic PVC I suppose).