yammy 115 losing power

lingcod

Petty Officer 2nd Class
Joined
Jul 27, 2004
Messages
181
this is a 1984 115etln. this motor idles very rough, always has, even after 2 complete carb rebuilds. off of idle the motor has always run great, until now. I can run for hours at 4000rpms but if I try to open her up to 5000 she'll run for a minute or two the start losing power. kinda like i'm backin off the throttle.as soon as I back off I can get her going again back to 4000rpms where there are no issues. last year i had both carbs rebuilt, new fuel pump. one thing I have noticed is that the primer bulb doesn't pump up hard. will this cause this issue? how about a fuel guage gasket not sealing completely?<br /><br />lingcod
 

lingcod

Petty Officer 2nd Class
Joined
Jul 27, 2004
Messages
181
Re: yammy 115 losing power

is this a first? no one can help. I don't believe it. <br /><br />lingcod
 

Ray Neudecker

Lieutenant Commander
Joined
May 25, 2004
Messages
1,656
Re: yammy 115 losing power

Seems to be a classic fuel restriction problem. Testing with a seperate fuel tank and line is a starting place to determine whether it is in the tank, fuel line or delivery system.
 
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