2 years sitting isn’t much if properly maintained and stored properly
change the impeller anyway . seafoam did wonders to my snowblower carb so you can try that and some Merc Power tune for the innards
carb is a lot more complicated (parts) than my old 9.8 carb …..personally I would just give it a good run and see how it reacts
test compression just for your own peace of mind and install new plugs …change gearcase oil and check for water infiltration ( usually foamy cream color oil)
if not a salty… I would not mess with the thermostat .. maybe if symptoms develop
Joining AOMCI has priviledges 🙂
