Front sprocket looks chuffed out, replace it with oem, if the sprocket he's free float, rather than held fast against the shaft, some aftermarket sprockets can be hardened through, and the spline harder than your output shaft, causing wear on that, not a good thing at all.
Oem will just have the sprocket teeth hardened, so no output shaft wear.
Get some good grease on the spline when you fit the new sprocket, I would go for a set.