The camshaft oil seal sits around – as you might expect – the camshaft, and seals in the splashing oil that is around that area. There’s no oil pressure in this area, and they seem to fail a lot less than the nearby mechanical seal. Looking at this one (this is on a CX650ED) from the inside of the rear cover:
The seal should be able to be removed with only a little prying effort:
The rear-wheel-facing side:
The engine-facing side you can see in the first pic, but here’s a look at what’s inside the seal – a spring, just the same as the gear shift shaft seal:
The inside of this one has a patterned section:
The oil seal is listed as 18x28x6 for both CX500s and CX650s – you can just make out the last couple of numbers in the first photo.
We will update this with part numbers in time.