David, I suggest you check the actual angle of your slope, then look in the Honda specifications or contact Honda. Pressure lubrication can potentially increase the slope you can mow on with a 4 stroke, but only if the engine manufacturer set out to do that, which is not all that likely given the possibility of someone being injured in a mower roll-over. I don't recall for sure but I think Briggs still limits their pressure lubricated engines to 15 degrees.
