2001 yz250 Revs HIGH when choke is off... Hard to kick start

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Apr 5, 2019
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#1
Very hard to kick start. Used to start right up, now takes a long time, lots of kicks.
Once started it idles fine with the choke on, but revs HIGH when choke is off.. I've played around with the idle screw, but didn't make much difference. Thought maybe a possible air leak? But couldn't find one.
Thoughts? Advice?
Think I'm gonna clean the carb and jets, and replace the spark plug. And give it another go...

Any advice welcomed!
Thanks!