Hi and welcome to the site.
When the lever is down the choke is off.
Is that your understanding?
I only ask because I have had people before thinking it was the other way around.
How long have you had the bike?
Is this only a new problem?
How old is the fuel?
Have you done any work to the bike just before it started playing up?
The lot of questions I know but it gives everyone an idea where things are at to help diagnose the problem.
C30F Power Up needle
2 turns out
Baffle out, Screens In
It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas