I have had similar symptoms with my 1990 90 HP Evinrude.
engine has sat up for several years,pulled and rebuilt carbs w/new kits,all new fuel lines,new impeller,gearcase lube,engine cranked but had to push in choke regularly to keep running,cleaned fuel pump,re-cleaned carbs but still have to push choke to keep running,was able to get boat on plane and engine ran good but as i slowed down engine would die.
Last two years just like above except I didn't rebuild the carbs. It ran well enough when opened up and I had to idle a little high around the harbor.
But mine wouldn't even start this year. Just a short run and die right away. What I mean by a short run is maybe enough to rotate the flywheel two or three times. I got a hard bulb, new gas and oil and spark all around. Did the WOT timing check as in the secret pages. all good.
Tear down of the carbs has shown me that the, I am assuming this is the main jets I am looking at, main jets and fuel feed tube have some sort of fuel sealant around it. Then the top plate has the same sealant and it seems to have broken down and pieces of the sealant are blocking the four jets that the two tubes feed their gas to. No gaskets on the top plates.
I cleaned all of this sealant type stuff up and made gaskets for the top plates. I used thin copper wire to make sure the tube is clear and the valve that lets gas in at the float. All jets are now unplugged. It is late here and I need to go to work in the morning so I will post tomorrow what the outcome is.
Did I mention plugs were only wet with what looked to me the fog oil I used to pack it up with for winter.
engine has sat up for several years,pulled and rebuilt carbs w/new kits,all new fuel lines,new impeller,gearcase lube,engine cranked but had to push in choke regularly to keep running,cleaned fuel pump,re-cleaned carbs but still have to push choke to keep running,was able to get boat on plane and engine ran good but as i slowed down engine would die.
Last two years just like above except I didn't rebuild the carbs. It ran well enough when opened up and I had to idle a little high around the harbor.
But mine wouldn't even start this year. Just a short run and die right away. What I mean by a short run is maybe enough to rotate the flywheel two or three times. I got a hard bulb, new gas and oil and spark all around. Did the WOT timing check as in the secret pages. all good.
Tear down of the carbs has shown me that the, I am assuming this is the main jets I am looking at, main jets and fuel feed tube have some sort of fuel sealant around it. Then the top plate has the same sealant and it seems to have broken down and pieces of the sealant are blocking the four jets that the two tubes feed their gas to. No gaskets on the top plates.
I cleaned all of this sealant type stuff up and made gaskets for the top plates. I used thin copper wire to make sure the tube is clear and the valve that lets gas in at the float. All jets are now unplugged. It is late here and I need to go to work in the morning so I will post tomorrow what the outcome is.
Did I mention plugs were only wet with what looked to me the fog oil I used to pack it up with for winter.
Last edited: