Can someone please give me some advice. 

When I start riding the bike with the clutch free play set correctly all is well. 

But after a bit of riding I need to lessen the free play, the clutch is engaging too early,  I turn the free play adjuster in. 

I have bled the clutch a few times and all is well. 

The clutch is newly fitted two months ago (9.7 mm of plates)

I don't understand how the free play can change while riding.... 

Thank you Gary

If you have the adjuster too tight in the first place the piston does not travel far enough to work. Everybody tries to adjust it just right, and it back fires on them. If you are trying to get the lever closer to the bar, it is possible to shorten the push pin. But do it in small steps and best to have a spare on hand.