I've checked mine on the rear wheel stand too... it shows the oil level at a slight angle at the lower level marks on the sight glass. Checking it using the balance method, the oil is just above the upper level. When I change the oil & filter, I refill the crankcase according to the specified volume, not to the sight glass lines. If your oil level is a little above the upper mark, I wouldn't assume that it was over filled by the dealership... sounds like they put in the proper amount according to the volume specified by Honda.
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