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I run twin 4 stoke 90's 2003. I have 400 hours on them and experencing major problems. I have had to re lap a valve on one and now the other one has lost power at high rpm's under load, missing but not at low rpm's. checked for water in the gas there was none. plugs are fine so it seems like maybe another valve is gone. Has anyone else had problems with these motors? I would expect them to run for more than 400 hundred hours without problems. I was a yammy guy but for all the lost business and large mechanic bills I am losing faith. Anyone else having problems?