I was changing the valve cover gasket and noticed something strange. Note: this is my first 4 stroke motor (YS 1.20).
I was rotating the prop and noticed the left side rocker only moving up and down. (Left side if your standing behind the motor, right side if your looking at it from the front). Aren't both rockers supposed to be moving? would you say this is a serious problem that i should send it in or is it something I can take care of.

Thanks,