I don't have the manual with me, but there is an easy way to get an idea what to use. Your needle setting. Yeah, I know....

Tune the needle from obviously rich into 2cycle. Turn the needle slowly. You'll know when you've hit the peak rpm when you pass it. Yeah, I know.... As soon as the engine sags or drops rpm as your closing the needle, back out a couple of clicks. The engine picks back up and you got the baseline rpm.

Do that with the most popular size prop for that engine size and you're good to go.