I bought a this used tractor about 6 months ago. It ran great for 3 months. It slowly started rattling some. It got a little louder but nothing I was too concerned with. One night when I was mowing, the engine came to an immediate stop with a big bang. The engine seemed locked up. I had a small engine repair shop look at it and they said the engine needed be replaced. I did NOT have them replace it. When they dropped it off I turned the key and it started right up. It starts and runs without a problem. Cuts grass fine but still has that rattle and I'm afraid its something worse. I haven't run it for more than 5 minutes since I got it back from the repair shop. It still has the rattle but of course I'm skeptical and I started to get my hands dirty. The compression on the engine seems fine dry and wet both held at 80psi. One last note, that the battery has not charged off the engine since I got it. I just pull the battery every month or so and charge it. I pulled the fly wheel off and it everything seems ok with it and under it. The stator is dirty but is not loose at all. The rattle does come and go a little. It also seems to be there at different RPMs.
Anyone have any ideas?
Here is a video of it running as I move the throttle up and down: http://1drv.ms/1V46xTX