Hi all, Last year I bought a 750 Supersport from 1992 (= wet clutch), which I'm working on now. Currently the engine just needs a service and some minorities and the bike is up and running again (and IMHO way better looking than when I bought it). One of those minorities is the screw next to the spark plug on the rear cylinder. What is the function of this screw and why isn't it on the parts list? The issue in my case is that I think there's oil leaking / sweating from behind the screw. Further, one of the former owners did not do the screw any good by molesting it with poor tools or excessive violence, so I'd like to replace it anyway. Questions: 1.) What is the function of this screw? 2.) Why isn't it on the parts list and exploded view? Or am I missing something and is it item number three? (See image). If not, does anyone know the right parts number so I can order it? 3.) Can I take it out without anything which is held by it falling into the engine? 4.) I suppose that applying a heat resistant thread locker (eg Loctite 243) or silicon gasketing product would be enough to resolve the oil leaking problem. Thank you for some clarification and advice!