Hello! I have a Honda HRX217K4HYA that doesn't move too fast, even when set to the highest setting on the hydrostatic cruise control. It will propel, but not quickly at all. Before I started to rip it apart, I was curious if anyone could give me a couple of pointers first. Like I said, it does propel, but not quickly at all. I know these things are rated for a 4 MPH speed, but it's not doing that at all. Is there some type of maintenance I'm missing? This thing cuts great, bags great and seems as if it would grind a tree stump down if I wanted it to. HAHA! Thanks in advance!