High Revs At Tickover, Can't Find Cause Of Problem

After removing cyl head and rebuilding, sealed liners and new head gasket, valve clearances adjusted, carbs cleaned and checked manifold rubbers, starts but revs to 2,500 plus, can't find what is causing this?

 

Hi, yes i have checked the cables and sprayed WD40 around, no improvement still revs to 3,000 ?

 

This is my second 900 Trophy, the first did 139,000 before I pensioned it of with several issues and kept the good bits. Went to the old carbs and cleaned them, and fitted them, tickover down to 900/1000 rpm just have a slight missfire to cure, I thik it is coil breakdown as it gets worse as temperature rises, time to play swap coils until I find the dud one.
Thanks for the responses to original post.
Bateby.