My monark 43 years old very thing works on the boat I still run my 850 Merc thunderbolt still runs strong I have 20 year old Minn kota trolling motor 45 lbs run just fine I have two humming bird graphs 400tx it's going into the shop for it's second carb overhaul in 45 years here soon the compression in all cylinder are in the 150's the motor never been rebuilt.