boat not running good with cover on

[godons]

i was out in the boat the other day and it run like a piece of crap with the cover on, kept stalling, when i took the cover off it was fine, i took the leg off a couple of weeks ago and i think the seal up the top of the exhasut come off, i took the leg off again and put it back on propally this time and it runs fine, but it run fine last time untill i had it it the water,do u all reckon that was the problem, its a 71 johnson 50hp

 

[jahughes]

Re: boat not running good with cover on

You probably got it right, I have one much like it that is having the same problem. Mine won't even open up in the test barrel until I remove the cover. I am planning on replacing the gasket this winter...<br /><br />--Jason

 

[godons]

Re: boat not running good with cover on

so it is the gasket that joins from the leg to the top of the engine

 

[h_lankford]

Re: boat not running good with cover on

do you guys have sound insulation blankets inside the cover that fall down and get into the carb intakes or the throttle linkages?

 

[godons]

Re: boat not running good with cover on

i ripped it out because i thought that was the problem

 

[nimmor]

Re: boat not running good with cover on

I am not for sure on your motor because I have not ever looked at a 50 but all the other Johnson's I have owned have a air breather located below the carb in the outer shell of the motor casing. They are supposed to be cleaned periodically just like the breather on your lawnmower. I had a 40 and got it running good at the house without the cover. Took it to the river and it wouldn't stay started. Cleaned the filter and it kept running.

 

[OBJ]

Re: boat not running good with cover on

You might also want to check around the power head adaptor gasket. If this leaks, exhaust will leak in under the hood and the engine will start breathing it's own exhaust.<br /><br />If you notice a lot of exhaust around the power head, find out where it's coming from. Blown adaptor gaskets are usually accompanied by an oily mess in the lower pan. And do check the other areas as covered by the other guys' posts.<br /><br />I believe on your 50, the hood air intake is located under the hoods hand grip. Might check here for any pluggage.

 

[godons]

Re: boat not running good with cover on

IS THERE ANYWAY OF TUNING THE MOTOR, ITS JUST SHAKING A FAIR BIT, IM GOING TO TAKE IT TO THE LAKE TONIGHT TO SEE IF ITS STILL LEAKING OR NOT, COULDNT I JUST SILCONE AROUND THE BASE OF THE MOTOR

 

[jahughes]

Re: boat not running good with cover on

I don't know if your 50 is built like my 10, but I tried the same thing with some hi-temp silicone sealant, and there was really no way to get in there well enough to really seal it up, just made a mess is all...

 

[Basscat 1]

Re: boat not running good with cover on

You might also want to check around the power head adaptor gasket. If this leaks, exhaust will leak in under the hood and the engine will start breathing it's own exhaust.<br /><br />If you notice a lot of exhaust around the power head, find out where it's coming from. Blown adaptor gaskets are usually accompanied by an oily mess in the lower pan. And do check the other areas as covered by the other guys' posts.<br />

Most probable cause.

 

[wilde1j]

Re: boat not running good with cover on

If the adapter gasket is leaking, you have to replace it. RTV won't cut it.