Downshifts getting herder when engine warms up

[PieEater]

Hi Fokkers - bike has done just over 60,000 miles and downshifts are starting to get harder to engage. I've adjusted the clutch cable from the top adjuster so there is some but very little slack, I've also adjusted the lever span outwards so the cable is being pulled in a bit more. Is it time to replace the clutch or is there something else I should be looking at first?

[agricola]

Always best to start with the cheapest option first if youre not certain its the clutch plates etc. Try a new cable.

[Trebus]

Might be worth greasing up the rose joints on the shift mechanism. There were some problems reported with the blanking plug falling out at then end of the main shaft causing oil starvation issues. 

Possibly some wear in the basket fingers which much need dressing.

That’s where I’d start after ruling out the cable.