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Smoking 440?

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I replaced the head gasket on my 98 xr440 with a new one that was the right size, but when I started it up to run it smoked more then my brothers RM250. I found that I left out the 2 metal sleaves that go on the cylinder head where it mates with the cylinder, does oil run through these? and if so with out them in place will oil leak into the cylinder causing lots of smoke? the bke runs great and makes alot of power so Im pretty sure its not oil getting past the rings. any info would be helpful thanks

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