I'm not sure the rear chainguard is preventing me seeing where the leak is coming from. My best view (but still not good enough) seems to be from ground level on the other side of the bike, ie the right hand side, the off side. The rear chainguard does, however, prevent me poking a finger behind where the alternator wires leave the primary chaincase in order to find out (here's a novice's question): when the alternator wires leave the primary chaincase, and before they come into view again above, just in front of the rear chainguard, are they in open air? I put some silicone sealant of the grommet on the inside of the chaincase and am just wondering if that is what has almost, but quite, cured the leak. Could the leak be there? Phil.
PS I will start a separate post about breathing.