I did mine without removing engine. (500t). Supported the engine with a floor jack and removed front, bottom, and top engine mounts and loosened back mount. Was able to raise engine pivoting on back mount. Cleaned bottom of engine and frame with Prepsall to get off 2 inches of dirt and grease. Painted front mounts and had all the bolts cad plated. Went over frame with Kit Scratch-Out after touching up some scratches. After polishing the side cases, looks great!