As already mentioned,those old 3 cyl. 2strokes are not meant for trolling. They just foul up plugs,and go through
a crapload of gas. I recently bought an older 1990 Honda 8 hp for $400. I can troll all day long on about 1.5 gallons
With a full size main engine,it could go through 10 gallons.Not only that,the carbon buildup can get to the point of
sticking your piston rings,and BOOM,there goes your powerhead!!