O-rings need to be lubricated to seal properly. Silicone grease works well on the head O-rings. I have found the head O-rings need to be stretched a few times to fit properly in the ring-land. On the GG bikes I have run all other gaskets dry with no leak issues. This makes it easier for later disassembly. On the other hand, if you plan to play submarine, I would RTV silicone the ignition cover gasket and rubber plugs for the wire passages.
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