Carb issues??

[LI150]

Sorry for not being the best at explaining myself but here is my problem.
I have a 200 engine with a 25mm dellorto and a AF clubman.
My problem is that the revs don't drop cleanly it revs on for a bit then settles down.
Whilst messing around with it I discovered it works perfectly with the choke on.
I have tried different pilot jets but still the same. Apart from that his it runs great.
Any ideas anyone.

[Daggs]

Air leak? Incorrect setting of mixture screw? Pilot too lean? Combination of these?

[LI150]

I have tried mixture screw and richer pilot so I am leaning towards air leak now

[Scooterdude]

Trapped throttle cable. Well that's my guess.

[LI150]

I have checked this. Also if I put choke on it works as it should

[LI150]

Problem solved - loose exhaust nuts