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Oil leak after engine rebuild

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I installed a new piston and new head on my 2004 250X. After I started the bike and ran it for about 10 minutes I noticed oil leaking from the head cover seal. It looks like the head gasket may also be leaking. Everything is torqued to spec and new seals were intalled. Any ideas?

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both valve cover bolt grommets in place and in the right direction? valve cover gasket pinched? o-ring installed on exhaust rocker arm rod access plug? o-ring still on valve cover/spark plug hole

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