Yamaha wr 250 electric start issue

Hi guys I have recently purchased a 2004 wr 250f and it won’t start on the button I have tried a new battery and also jump leads it just keeps turning over and won’t fire but will kick start first time when it has warmed up it will sometimes start of the button but you have to keep twisting the throttle and then if your lucky it will just about go but like I said give it a kick and it goes every time, have stripped and cleaned the carb and has made no difference any info or advice would be great

250F's with tight valves act like yours.  Have you checked the valve clearances?

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