Serveral Questions related to a 1988 88hp Johnson

[nastyquedawg]

My boat was dieing to idle after runnig at WOT for about 20 secs. I installed a new fuel pump and ran it today. The boat ran for about 60 secs before dieing ro idle. So i figured it must be some trash in the carbs. Took it home. took the bowls off of the carbs and used compressed air to blow out the jets. I also change all of the fuel hose becuase I was not sure that the lines were ethanol resistant. Go everything back together, started the motor and it seems to idle higher than normal, so here are my questions.

1. Does the installation of a new fuel pump require me to adjust the idle?
2. What does this valve(item A in the picture) do on the primer solenoid?
3. Which way should it be turned. I cannot remember which way it was turned originally. When I turn it to the right it kills the motor, but do I need to turn it all the way to the left or some point in between?
4. There are 3 lines on the bottom of the primer solenoid. The two smaller lines(items B&C in the picture) are connected to the top of each carburetor and the bigger line is connected to the fuel line. I cleaned out the jets and bowls on the carburetor and forgot which line goes to which carburetor. Does it matter?
On the bottom of the motor in the front there is a vaccuum line that runs from the block to the left hand side of the air silencer assembly. The hose had a hole in it and i replaced it. Would this repair modifiy the idle speed?

Thanks

 

[emdsapmgr]

Re: Serveral Questions related to a 1988 88hp Johnson

It is possible that you cleaned some debris out of the idle passages in the upper barb body during you carb cleaning. This may permit a little more fuel to enter the crankcase and may be why the idle has gone up somewhat. That's a good thing. It should have nothing to do with the fuel pump. The valve in the picture has a "run" position and a "service" position. When you are running the engine, the length of that lever should be parallel to the length of the solenoid. It is not quite set correctly in the picture, probably because you have the solenoid clamp in the way, restricting it's normal movement arc. It does not matter which of the two small hoses are connected to which carb. Usually the length of the hose will tell you which carb it came from. It is unlikely that replacing the airbox drain hose will have much effect on the idle rpm's-but it will reduced the fuel/oil leaking into the lower cowl from the carbs. Reset the idle to 650-750 rpm when the engine is in gear and the boat is floating at normal level in the lake.

 

[nastyquedawg]

Re: Serveral Questions related to a 1988 88hp Johnson

Thanks you are the man