motor trouble help ...............

[pinto 21629]

i have a 1960 johnson super sea horse 40hp it starts good but it smokes a little more than i like and if i leave the cover in front of the carb closed it will not pick no speed but if i leave it open it runs fine and like i said it somkes alittle more now than it did before the lose of power when the door in front of the carb is closed open it and it run good o if i stop and fish when i go to move if i dont pump the primer it start right up but if i pump it it acts like it is flooded if any one can help it would be great because i have had to fix a few things on it but this one has me stumped i changed fuel pump difram head gasket head cover gasket new plugs but one thing i have not redone it the carb rebuild o it has a little rattle sound a idle but dont here it at wot help help help help

 

[cblguy4u]

Re: motor trouble help ...............

try cleaning the air intake right below the motor on the shroud.(2 bolts)

 

[Solittle]

Re: motor trouble help ...............

pinto - Check for an exhaust leak around the base of the engine. If your carb is sucking in exhaust gasses it may not be getting enough oxygen. That would account for it running better with the carb door open. I would also suggest that it is time to soak and rebuild the carb.

 

[R.Johnson]

Re: motor trouble help ...............

The reason it won't run with the front cover closed is because exhaust gases are being sucked into the hood. Your engine has a outer shroud around the exhaust housing. If you were to take the back cover of this shroud off, you will see a large rubber donut seal around the exhaust housing close to the bottom of the housing, and shroud. When the seal comes apart, or cracks with age, exhaust gases are pulled up the shround, and into the hood from the draft created by the carb. I don't know if this seal is still available. If you can flood the engine with the primer bulb, it is probably time for a carb rebuild. As for the smoke, use a good grade oil. The newer oils from Bombardier is supposed to help, plus give it a good tune-up if the rest of the engine is sound. Start with a compression test.