2004 Honda crf250r idle problems?

IM 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. Thanks in advance I really appreciate it.

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