IVJ 600z starter clutch

[mushroom supersnake]

Starter clutch on my 89 IVJ tenere has been dodgy for some while now -
sometimes it won't disengage making it impossible to kickstart as it
drives the starter mechanism around with it in this state.
it is usually possible however to disengage it by repeated use of the starter button.

I've looked at the microfische for this engine, but it isn't clear if the starter clutch is contained within the RH engine casing, or if it means splitting the crankcases to repair.
Be great to hear from anyone who has a cost effective fix for this problem, or a workaround.