After my previous work on the bike I found the problem to be low compression and the cylinder was replaced.The bike now starts every time and idles at 1500, as i set it to that, but as soon as any play with the throttle happens and the revs go above 3k, it doesn't want to come down past that mark. Pilot screw is fine and from my knowledge there is no space for an air leak anywhere.

Edited June 9, 20204 yr by bumbaclartio

Hi there " iwould disconnect the throttle cable ,  start bike , lift slide manually [ rear with airbox connector  off ,   see if it settles and revs,,, to isolate cable , 

As above, and I would still spray carb cleaner or similar around all the hoses and connections just to positively rule out any leaks