mine leaks from this area when ran hard ( it has 19,000km on it)
there is a rubber o-ring on some of the clutch cables where it seats in the case that may be bad or is a cable with none
and mine has a rubber boot also in this area
i am not a fan of the simi syn oils some are too slick and will ruin the clutch
fiber plates
i use shell rotella T 20w-50 oil
my dad always said "if it does not leak some where it must be out of oil "
but then i think it was a BSA he was talking about
ar dave
ps there is a hose on top the motor to the frame tank this should be checked
and renewed as it is a major pain in the A to change on a trip ...on mine
the gas tank must be removed to get too it
poor design results in the fuel shut off having to be removed
to get the tank off even after draining it dry there is still a bunch of gas in the tank..the job best done outside with care