2004 Honda crf250r idle problems?

I'm NEW TO DIRT BIKES AND WANT TO LEARN. I recently bought a used 04 crf250r. Everything was fine first couple of rides. Even the test drive was perfect. Started up fine shifted right and everything. Few weeks have past and now when I kick start it in neutral, put it in fist and it dies. Turn the chock on and it ll crank and idle in first. But without that it don't want to stay crunk. I was thinking I wasn't letting it get warm enough but I don't want to let it sit there and idle with the chock. Someone told me that could damage the engine. Can someone help me or give me some tips.

The term is 'choke', not chock.
Letting the engine warm-up with the choke is fine, once it's warm turn it OFF.

Look at the plug. Buy a Haynes or Clymer shop manual on the bike. Gitcha some metric tools.

Do some simple stuff first.
Install a new spark plug.
Inspect the air filter.
Clean or replace if necessary.

Clean the carburetor - especially the pilot jet.
The pilot jet is used in the idle and slow speed circuits.
The pilot jet's opening is as thin as a pin head and is easily clogged with bad gas.
Using the choke adds addition gas which compensates for the lack of gas being restricted by the clogged jet.

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