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Big bore kit, Jetting or valce clearence?

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I bought a bike 2007 yz250f with a big bore kit, the guy told me it has a 290cc, Do I need to change jettings and or do I need set the valve clearence a little different, just because I have a hard time starting this bike.  Once started, it starts its fine but then if I leave it alone for a while its hard to start.  Also if I stall it, its really hard to start, just looking for direction.

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