Andy wrote:When you say "a decent sized pool of 2T oil under my '91 MC21", just how much are we talking about? Not that there should be any under the bike! Is there any oil left in the reservoir/remote? Or is it all on the garage floor?!

Have you checked the transmission oil? This one probably sounds weird, but the 2T pump shaft seal can become unseated allowing the 2T reservoir to drain into the transmission. It's not common, but it does happen more than it should. If you take the cap off and oil immediately flows out of the filler neck, then you've found the problem.

Any oil around the outside of the RC Valves could indicate the RC shaft seal(s) are worn and leaking, and possibly a rich mixture and/or badly adjusted oil pump.

Hi Andy, Thanks for jumping in on this one.
A decent pool is perhaps half a teacup or a good three finger slug of your favourite spirit depending on your preference.
Both reservoirs are full, roughly as full as I left them anyway and the oil on the bench is Rock green.

In order to check the bike ran OK I kicked it up and hand forced the 2T pump wide open just to provide a bit or extra oil for the initial minute or so...but the bike has not been run and has just sat on the bench whilst working on the swingers etc. (err just noticed the typo here, I think the confuser spell corrected me...sofor the record I meant "whilst working on the SWINGARM etc)

I will have a look at the gearbox oil as it needs to come out anyway...might be interesting what I find in that lot! And given the oil pump is wet I need to have that apart and check it out.

The odd bit is the exhaust collet and RC valve...I just can't figure where it has come from.

Still it's all part of the fun!!

Cheers
Max