depends on many things.

How much water was in the tank, how long it sat, how much rust is in the tank, etc..

My guess is that since it's only been sitting for a couple months, it's not that bad. I would drain the tank, pull the petcock/filter and see what is in the tank.

Also, it looks like you have the reed valve/blocks off so you can see down into the cases and get an idea if there has been any water sitting in the bottom of the cases, see if there is any damage to the bearings.

But I really doubt its going to be that bad if it's only been water separating from the fuel (not going to have that much water).