Jimmy,

I think you got the wrong idea from my comment, I have owned almost all the YS four strokes versions, and in the manual says to have the cam gear at 12 o'clock, and in several models is mechanically impossible, that's the reason for the suggestions, so if that is the condition, then is when you install it as close to 12, but you will have to choose forward or aft of the 12 position.

Review the post again and you will see I say to do that if it does not fall exactly at 12.

Regards