As you may or may not know I've been using my LX-176 JD tractor for mowing my first year and am thinking about getting a real commercial mower. I am trying to decide between a ZTR and WB. I am concerned with the power of walk behinds. Seems the same deck size in a ZTR has a much larger engine. I assume this is because of the extra weight but if you add up the weight of a WB, a sulky and the operator, it is quite a load for the WB engine. Exmark 52" Lazer HP 23hp = 965lbs + me (180lbs) = 1145lbs Exmark 52" Turf TracerHP 17hp = 614lbs + me (180) + sulky (40lbs??) = 834lbs That's only a 311 pound difference, and the ZTR has a 35% larger engine. I guess what all this is leading up to is the question: Will a 17hp 52" WB have enough power with a sulky and me on it, even when mulching? Thank you, Joel B.