did i mess up?

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96yamahawarrior

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so a while back i was pulling the header off my quad, and long story short, one stud broke off even, and when i tried taking it out with a ez out, a peace of the head came with it.
so i found another warrior for cheap with something wrong in the bottom end.
i deceided my best bet was to swap that head onto my engine. but now that it is on there, the quad wont idle, at full throttle it revs up and down, and has no throttle response.
the quad ran good before the swap.

maybe i messed up with the timing marks on my chain?
i adjusted my valve lash, but maybe it got knocked out on first run? would that cause this though?
maybe the carb?
 
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