Thanks, although she is only a little 'un compared to a 999. The air filter screws all went with quite a crack when they come undone so have to assume it has been a while since they were last undone. My rad hoses are the "mark 2" type from your post with the 2 short lengths only. The interweb says they are 24ID x 32OD. Inevitably stock silicone hose sizes are 25 ID not 24. The factory stuff is only buttons for these though.
I have a similar problem on a 999. I found oil around the H Cyl spark plug. I found this before it had spread further. Looking at this image, the tube, which is part of assy 1, seemed to be the culprit. The manual said to NEVER remove this and so I didn't. I replaced the cover gasket. I'll have to wait a couple of months before I can properly test this. Maybe mine is in the early stages of this issue. In my image, the shiny area below the plug is oil!
Can't find industrial replacement for these washers (bonded nitrile lower/ steel upper face), looks like i need genuine. 6 washers @ £8 each + delivery and 2 week leadtime, that's a decent coin for a few washers! They seem to be a sensible design (metal face to allow bolt to turn without snagging and bundling up washer) but would have been better if they existed elsewhere. Based on comments above, people are having success with a plain sealing washer , was looking at nitrile as it is "A" for compatibility with engine oil, is that correct. I have a week or so until cam cover is bac from powder coaters
The valve train cover/cylinder head gasket also commonly leaks from the centre O part around the spark plug channel which allows oil to collect around the plug. Remove it, clean it, apply a smear of ThreeBond or similar RTV sealant to both sides and it will fix it.
