Suspect you're talking about the flywheel/starter pulley. Not familiar with 4 strokes or indeed Hondas, but suspect you'll need a puller. Most flywheels are torqued down to a tapered crankshaft. With BF90 there's a plastic cover as far as I'm aware, drive-belt, etc. Remove that and post up some pictures.
the Honda 2013 4 stroke 90has no belts, the flywheel is located at the bottom of the powerhead. What is the flywheel on every other outboard is called the rotor on this engine. under it is the stator for charging. there are no teeth for starter. There is one bolt in the center of the rotor as would be on any other engine. I do not know if right or left threads. I do know it is very tight..I looked it up in parts and it seems to be a simple bolt.Service manual i have is only a picture.
I was hoping someone out there had a way to remove this but i suspect it is time to remove some parts and diguard the rest.
Sula
