Yamaha 50hp problem

[tonymoorerhos]

Hi can anyone please help I have a 50 hp yamaha 2 stroke outboard 1996 model and it has developed a problem the engine will start ok but after about 1 minuite it will not power up as normal it feels like a fuel or electrical problem causing a restriction in power I checked the fuel system and fitted a new fuel pump and checked the carbs seem ok please help Tony moore

 

[Kawasaki]

Hi and welcome Anthony.
These long range outboard diagnosis probs can be quite difficult.
You will get lots of help on here though.
You say You checked the fuel system.
What made You fitted a new fuel pump?
Was the pump definately US or was this just a remedy suggested by a third party?
Scuse the questions but it bit more info and somebody might be able to help.
As said, there are some clued up Bods on here.
K

 

[markosy]

Have you replaced the spark plugs, these could be oilling up, a marine engineer recomended that the plugs should be replaced once a year regardless of use on a 2 stroke

 

[Nautorius]

Anthony,

Please bear with me. Have you got the 'Airhole' on top of the fuel tank open? It is a small screw type fitting on the filler cap?

Cheers

Paul /forums/images/graemlins/frown.gif

 

[tonymoorerhos]

Done All that has been mentioned have took off the fly wheel and have noticed a some rust on the fly wheel where the electrical magnetic coils pick up from

thanks again /forums/images/graemlins/ooo.gif

 

[Lakesailor]

Sorry There are 9769 threads to wade through. But you will find the answer Here.

I did.

 

[Lakesailor]

By the way. It's fuel. Have you checked for water in the tank and checked the inline fuel filter?