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Just purchased a 2004 CRF 250X, it is hard to start hot or cold, when starting cold does have oil smoke for a pretty good while, once hot no smoke. Tries to start and pops through the exhaust and eventually will start. have not checked valve clearance but does this sound like having the tulip valve problem.

Adjust the Valves. Sounds Like you might have Bad Rings too, maybe Bad Valve Seals/Guides Also

yeh I am thinking the same thing, bike runs and drives great other than this.