And here we go with a new shopping post. And again, all parts in it are for Kawasaki KZ650 engine, which is no wonder as engine assembling is my next big goal. As I already have a new KZ750 cylinder head, I suppose it wouldn’t be surprising that I also bought new OEM intake and exhaust valves for it. Part numbers of valves might have been superseded and sometimes it might have happened more than once. In this case I prefer to stick to the latest part number even if early part numbers are available in large and for lower price, because superseding has a reason. And the reason often is not sufficient valve resource. I have seen cylinder heads in which intake valves working surfaces had grooves while exhaust valves were completely intact or otherwise: exhaust valves had grooves while intake had none at all. I assume that in these cases less worn valves were “up to date”. So when it came to choosing between cheaper intake valves with part numbers “12004-1007” and more expensive valves with the latest part number “12004-1058” I didn’t hesitate for a long and bought valves with newer part number.
These PMC idler sprockets are made for bigger Z-s. However, it’s well known that sprockets placed between cylinders and cylinder head are interchangeable for Kawasaki KZ 650, 900 and 1000 models. This fact quite simplifies life for KZ650 owners. I have no real reason to replace these parts, as original sprockets are in very good condition. However, OEM cam idler sprockets have a layer of rubber between inner sleeve and crown. I have read on KZRider, this rubber has a tendency to crumble which results in separation of the sprocket crown from the inner sleeve. Knowing about issue I decided to avoid it by replacing old original idler sprockets with monolith made by PMC.