metric vs standard tools

[jartzh]

I am going to work on my motor at the lake so I need to take all the tools I need. I am replacing the impeller. I have the service manual but it list everything in metric and standard.
what wrenches do I take? metric or standard?

9.9 2 stroke merc. around 1990s vintage.

 

[fastjeff]

Metric.

Jeff