1987 TRX 250r top end failure.
This is a customers quad that was brought to me with a seized top end. I was hoping to find something like a cooling problem or a damaged piston, but instead I found that the crank bearings had failed. This machine is an 87 and I would guess that the crank has never been changed before. On most any engine, there should be no vertical play in the connecting rod. This one has about 1/4″. In addition to that, all the pieces and fragments of the old bearing are now in the crankcase. Unfortunately, the parts list and associated labor for this repair is too expensive for the customer at the moment, so I am returning it to him in its current state.