96 Yamaha 25hp MLHU

[drallison]

Hi Guys,
I have tried all I can think of! She seems to "run out of gas" at WOT - I can squeeze the fuel ball and it runs fine?? Here is what I have done:
Replaced fuel pump, hoses,clamps, fuel filter and o-ring. Replaced the fuel port on the motor and eliminated it on the fuel tank (straight barb). The entire fuel line and bulb are new. I have been going on the assumption that it has been sucking air but now I just don't have a clue?? Any ideas?

TIA - David

 

[yamamarinetech40]

Re: 96 Yamaha 25hp MLHU

Go to hardware store and get a plastic barbed nipple and a piece of clear vinyl hose. Put this inline just ahead of filter. Run engine and watch for bubbles...a few little ones are ok....I suspect your carbs need a rebuild by now....make sure the timing is advancing to 25 degrees at wide open throttle...

 

[drallison]

Re: 96 Yamaha 25hp MLHU

Thanks - I'll give it a try!

 

[Ray Neudecker]

Re: 96 Yamaha 25hp MLHU

I would also vote for the carb cleaning. They have some small passages requiring extra attention.