2005 kx250F camshaft cover issue ?

So i have a 05 kx250 head that my exhaust camshaft doesnt budge when i hand tighten the cover/cap. My intake camshaft does just fine so i bought a new camshaft, that didnt work, i bought a new head cause i was told the old one had oil starvation and looked bad, that didnt work either. Im just lost as to what it could be its a pretty straightforward process but i just want yo ask around and see what could it be?

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