Dropping in to top gear, revs rising yet you are not going any quicker - sounds like a
Clutch overhaul is called for.
Buying the correct specification
Clutch plates will mean years of good service, and if ridden with some mechanical sympathy, perhaps a lifetimes service!
We recommend that you give consideration to replacing this
Clutch Centre and the
Clutch outer at the same time.
Check out this related item:
22121096701
Don't forget to order new gaskets and seals at the same time, reusing the old ones is not recommended! Try this gasket sealant: 08C70K0234M for a more professional result.