It's all good Rob, it expands our case files in the archives. Also, I hadn't seen a chonda valve disk before, and now that I have, I'm not impressed.

When you swap a Honda hard fibre disk for a chonda plastic disk, I think it is best when possible to replace the tin cover (the "Breather Chamber Cap") as well, because the Honda one has a somewhat flat stop instead of the relatively pointed one used by the chonda:
[Linked Image]

The disc valve is called "Valve, Breather". The Honda Part Number is 04521511, but more importantly the "HP#" is 12372-879-000. It seems to be used in a huge variety of Honda engines. US List Price is only $1.87, but shipping to Australia is a problem as usual. There may be a way to get a decent-quality non genuine one, instead of that soft-looking plastic thing, but I didn't find one with a couple of minutes searching. You're at least as good at finding them as I am, so I'd best leave it to you.