Rattle update...
They called me this morning and told me it was coming from the housing over the blade pulleys that was the root of the problem. I went to the shop to physically see what he was talking about.
The housing itself is made not exactly right. They even pulled the housings off of three other mowers and compared them with all having the same issue. That issue being, one side of the housing is lower than the other side, and when the blades are moving at full speed, they are vibrating the housing and deck enough that they rub every other second or so, thus causing the metal on metal sound. Kind of the price of having fabricated equipment as opposed to stamped metal. Humans just make imperfect things. And it was probably made on a Friday...or a Monday.
Anyway, their solution was to grind off the small section that was lower until it was even with the bottom of the rest of the shield. It worked. No more rattle. Also, it hasn't backfired since the 3rd time I turned it off.
Before all this was settled, I called to talk to the salesman about exchanging it for another in case something was really wrong with it considering their was less than an hour on the mower. He wasn't there, so they gave the phone to the store owner instead. He just added fuel to my fire. When I told him what I wanted, he said, "That's what your warranty is for. You wouldn't try to bring a car back." I said, "First of all, this isn't a car, it's a mower. Second, when you buy a car, or even a house for that matter, you have the right of recision for 72 hours."
He got a little angry, and told me I was being extreme, and nothing was perfect. I said, "I don't really think I am. When I buy a $5,000 piece of equipment, I expect it to be perfect when it comes off the truck, and I start it for the very first time. I'm 47 years old, and the most expensive piece of lawn equipment I've ever owned is a 27 inch self-propelled Lawnboy, just to give you some reference." At this point, he stammered around and said, "I don't get involved with Joe's (the salesman) deals. You'll have to talk to him when he comes back."
After my talk with the owner, the ONLY reason I didn't go ahead and return it was because I've known Joe since college, and he's an honest person. I know he'll take care of me if it comes down to it. When I talked to him, he was willing to do the exchange even though I know it would've brought the store owner's anger down on him. He was able to get the problem solved, and I was happy with it.