To check oil and water level I just pull the bike upright, then hold it that way with the pillion grab handle (I'm on the opposite side to the side stand) then crouch down and look at the levels. I'd never lean it against a wall. Sometimes need to wipe the expansion tank first to have better view of level. Funnily enough, I had to top mine up once (ever) and same with my car (about 3 years ago it started losing coolant, then stopped). No obvious signs of leaks in either vehicle and no mayo in their oil, so all a bit odd but gone away.