I have an old Toro self-propel from about 1988. The model 20611 serial number 9021990. It has what I remember to be a 3.5hp Tecumseh engine. It still runs and the deck and self propelled drive still is in working order. The motor is hard to start but will run. I wanted to get a gasket set so I could clean it up and seal it up. I looked for motor numbers or markings and cannot find. Seems like all the guides show 2004up. I looked for a replacement motor but can't find one with the shaft 20mm by 2in keyed with 3/16" keyway. It looks like the pics of LEV80 but not sure if this is the same. Can anyone help with ID and parts and or engine replacement? The deck and wheels etc are too good to throw away.