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04 kx250f rough starting when cold

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So I let my bike sit all of last year except for the occaisonal ride around my neighborhood to keep everything from going stale.  The beginning of the year it fired up on the second kick.  But now I can't get it to start cold almost ever.  It took me probably 30 kicks the last time I kicked it over but every time since I've had to bump start it.  Also if I let it sit for a while and cool down after riding I have to hold the throttle wide open or it wont start.  I thought it might have something to do with the valves since they needed to be adjusted but I'm still having the problem after adjusting them.  The only other thing I can think of is I put a pipe on it and didnt re jet but I'm thinking is should still start.  Carburetor is clean, valves are in spec, spark plug is brand new, and I can't think of anything else that would cause this.

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