Results of tonights tinkering ...

[Fallout]

Doesn't matter if I have a gsxr 750. That's still a good read Sid and lots of useful nuggets of info in there. It still applies, albeit in slightly different ways.

Loose and tight until they bottom out, or just loose and tight forever and ever?

The former, luckily. The threads aren't destroyed, just showing signs of mild over-tightening/cross-threading. Eventually all plugs bottom out. I've just given them an extra bit of torque this time round to keep them in.

Where specifically?

Where the airbox connects onto the throttle body (I assume it is - not sure on names), the 4 valves there have some oil build up. There is also signs of some oil in the airbox and around the general area. The pipe that wasn't connected was the central one to the airbox, which came from low down in the engine. Only had a quick look. Not sure where it was from exactly. My thoughts at the time were down near the gearbox, but could've been low in the crankcase maybe.

If it's the one I asked about above, then no, it doesn't.

Probably started better because my spark plugs are in better now!