Where is the oil filter located on a 2001 suzuki z400?

It is located on the side of the engine, above the rear brake pedal. Should have 3 small screws to loosen and the cover will come off. Be careful not to damage the O-ring on the inside of the plate, and make sure you put it back when finished. I also recommend getting a K&N washable filter. After a couple changes, change the o-ring.