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As long as the engine oil is only slightly darker than new oil, it should be alright. For checking the lower unit oil, I would pull the bottom drain plug and make sure that you didn't have any water or milky looking color to it.
As long as the compression is close in all cylinders, the cylinder rings should be okay. I'm not sure what the compression is for a Honda 50 four stroke, but for a Yamaha 50 four stroke, the compression is 139.2 psi.
Even though the gas was changed, you could still have some built up varnish deposits if the engine hadn't been run for a while.
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