Welcome to OCC! The 1650 is a beast of a machine.
Parts are basically everywhere. Most wear parts are available new (bearings, clutch, springs, switches, etc.) What is not available new may be found as NOS/new old stock or used. Check the forum sponsors or google cub cadet parts suppliers. ccspecialties.org and ihccw.com are a couple parts suppliers I use.
Go to the technical section of the forum and download the owner/operator manual, the chassis service manual and the Kohler engine manual.
Post up some pictures.
