I have a 2005 Seadoo GTI 2-Stroke. When attempting to start I get a whirring sound from what I think/assume is the starter. Battery is new and I get 2 healthy beeps when I connect the lanyard.

How can I diagnose the starter? Does anyone have suggestions on a good starter replacment video or documentation? Could it be something other than the starter?

Thanks in advance for any help!