Hello all, I purchased a well used L225 a few months ago and it has been very good to me up until a few nights ago. I was pulling some trees I had cut down into the pasture with it and all of a sudden out of nowhere the was this loud knocking coming from what I assume to be the motor. I shut it down immediatly, and checked the oil level again( I check it everytime before starting) and it looked ok, for having just been shut off. I started it again and the knocking sound keeps up with the RPM of the engine. So I shut it down again, and thought about how much this is going to cost me. I was all the way on the other side of the yard so my plan was to start it up and keep the RPM low and back up as fast as I could to the shop so it was accesable to work on, and as soon as I started it again, no noise, nothing. My question is, what would cause this motor to knock like that and then stop all of a sudden????? I have not used it since then and have not had time to do anymore troublshooting. Any help would ne greatly appreciated. I am mechanicaly inclined but I want some more info before I start tearing the motor down. Thanks in advance.