'06 900 classic LT, with 28,660 miles. I have all the usual ticking noises and belt noises, but after last 300 trip to KC I heard a howling noise from my engine. Had to ride it the return trip home (300mi) trying to ignore it. It is all the time with engine running, clutch in or out and moving or not. It changes pitch with engine speeds.
Dropped the oil and found metal in the oil and filter, removed oil inlet screen and it has nothing on it. Have left side case off but don't see any problem, can see left cam chain and oil pump drive chain but they seem okay, flywheel dosen't move up and down or balencer, turning engine over by hand sounds some what normal but will remove right side cover tomorrow evening... getting late.