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02 CRF450R Water Return O Ring issues

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Ok so we're rebuilding an 02 CRF450R, we got TDC, all put back together, went to kick it over to find we had little to no compression. We think the problem is with the O Ring on the water return on the head cylinder to the water pump. We've tried setting it above the base gasket as well as underneath to no avail. I'm wondering if anyone knows any tricks as there's no inlet for the o ring to sit in. Any information on this would be greatly appreciated, thank you.

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