I bought a used (2003 I think) 20/48 lazer hp last year with 80 hours on it. The hydro belt had to be replaced at a little over 100 hours. Now, at 180 hours, it needs replacing again. This thing is eating up the hydro belt like crazy. None of the pulleys seem to be bent, and I keep the idler greased. I have heard about this problem on other hps. What's the fix?