eBay has manuals. Search CX500 manual. The cam chain tensioner on the ´78 model but it was fixed in ´79. The stator would burn out a coil and wouldnt run or go above 4500rpm. Also the waterpump seal is a big one. After sitting like that the seal could self destruct. If you are going to pull the engine for anything change the seal! If it is bad it will dump coolant in your oil. Run silicate free coolant. Wikipedia the CX500.