I have a 2016 Honda HRR216K9VKA self-propelled mower. It's pulling weakly, and all signs point to needing a new belt, so I found a video for this model on you tube (can't find it now) that seemed straight forward. Everything matched up except the part where they remove the rear belt guard to...
Are you saying you put 2-stroke oil in the oil pan of a 4-stroke mower, or that you put oil/fuel mix for a 2-stroke engine in the 4 stroke mower's fuel tank?