Squeaky clutch lever

My clutch lever is very squeaky, can't find the cause. Tried removing the retaining pin and greasing and oiling that but no good. I think the squeaking is coming from inside the clutch assembly and was wondering if anyone has had this and if they had to take apart the clutch unit thingy rather than just removing the lever and oiling that. I've noticed a little clicker button too but don't think it's that.

Would really like a squeak free bike as that makes it feel newer than it is. It's blimming old but I still like it!

Thanks

 

Have you removed/inspected/lubed the brass bushing in the clutch lever that the master cylinder rod engages?

 

I haven't but i'll give that a try, cheers