25-10-15, 10:41 AM
I have to use a decent torch to see mine. Tilting the bike slowly left and right may help you spot the level, though that is really a two-person job.
You may be able to improve the view by taking the cover off and cleaning the inside of the window with a cotton bud. It can be done without losing oil if the bike's on the side stand, but you'll probably need a new gasket.