That rust looks like it`s eaten into the bore, the chances are any rust that may have been sitting proud of the bore has been `wiped` off when the motor was first started up a couple of weeks ago. An inspection of the piston skirt may show this!
Can`t quite make it out in your photo Matt, but is that the crank counter weight, and is that a shiny patch on it? Maybe caused by it wiping the bottom of the piston skirt. A quick check of the underside of that piston skirt may show scuff marks!...
Attachment 66549

