Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
DO NOT use any gasket compound on any Honda
Solution provided via this forum, once again. Thank you! D.
Yes indeed. I received a suggestion by PM hence not sharing, sorry.I was shown a picture of an 'oil pump gaskets set' that had only two of the questioned O-rings therein. The two options shown in the parts catalogue are shown on David Silver's website to be of different sizes, 13.8mm or 15mm. I simply then measured the ones off my bike (15mm). I'm still unsure as to why there are two sizes, but at least I got the answer I needed to progress.Cheers,D.
Hondaman on the US site has worked out that modern gaskets are thicker so you need thicker cross section O rings to seal properly.
Bryanj - the copperised ones are the ones I was thinking of. I'll check out Hondaman too.