boat runs on land not water???

[keith martin]

1985 85hp chrysler force runs like a champ on land with water ears on.put it in the lake and it dont even want to start.i check for fire and i had to replace cdi box and i am still having the same problem.i have no idea what is going on. water pump is pumping water. also having problems with pump ball will not pump to hard state flows right though to carbs and floods out.please can anyone help me?

 

[southernpride]

Re: boat runs on land not water???

What your describing to me sounds like the float valve is stuck in the carb and when your trying to to build the pressure up in the ball, the carb isn't holding the pressure and letting fuel go straight into the intake. So when the engines turns over all the fuel goes straight into the engine and is automaticly flooded. I'm sure there is probably a different explanation, but this is just my opinion. no why it will run in the yard and not in the water? I have no clue.

 

[roscoe]

Re: boat runs on land not water???

Carbs sound like they need a rebuild for that sticky float valve.

Bet check the compression first.
The back pressure on the exhaust when you drop the motor in the water is causing the engine to not run properly. Usually caused by low compression on one or more cylinders.

 

[keith martin]

Re: boat runs on land not water???

i will have to try it thanks alot

 

[CharlieB]

Re: boat runs on land not water???

Adjusting the idle mixture while on the garden hose you will end up almost 1/4 turn too lean once you are in the water.

Readjust idle mixture IN the water at idle IN gear.

 

[Tom Sherwood]

Re: boat runs on land not water???

Check your exhaust flapper in the exhaust elbow. The melt away and can leave parts of itself in the exhaust.