Hi Chipmaker,
I agree, these problems predated my having the machine - I have about 10 hours on it. The bro-in-law had it 3 years, but one year he didn't mow because he was burned out (- his house went up in flames, not he was tired) They had it back to the dealer pretty much every time they mowed, so they gave up and bought GREEN - a CUT with blower, loader, and mower.
I think the troubles all trace back to a dealer not wanting to provide warranty service and so not doing the repairs completely. For example, the blade timing thing was from timing gears that had broken at the keyway, and from the dirt in the break, it wasn't yesterday it broke. The Idler pulley and the belt problems came from someone replacing a pin with an oversize pin that interfered with the idler and belt. Many times, mechanical problems require you to look beyond the initial problem to fix them properly.
Chiip, you've probably heard me rant on the need for designers to think about the abuse that people should be able to give their machines, so it's reasonable to think I will abuse it, but my abuse will be limited to mowing at full speed, and trying to go around corners at full speed. Also, maybe setting up a hydraulic system on the deck drive train and putting a snowblower on it.
I won't be doing anything to the machine it can't handle. It's actually a well-designed, heavily built machine, with a decent engine and it should do a good job. I just get frustrated doing other people's work over again!