Engine runs fine until in full throttle wont speed up

[jcastillo21189]

Engine is a 135 hp mercruiser 3.0l it starts up fine runs good once i put throttle more than half open it doesnt speed up at all even if i put to full throttle. At times if i keep the throttle open for about 3 minutes it finally speeds up

 

[Glastron_V210]

Re: Engine runs fine until in full throttle wont speed up

Seems like you need a carb rebuild.

I suspect the carb accelerator pump may not be working.

How long has it been since you did rotor/cap/plugs/wires?

Chay

 

[Bondo]

Re: Engine runs fine until in full throttle wont speed up

Ayuh,.... Welcome Aboard,.... When was the last time it saw a Tune Up, 'n Service,...

Sounds like Crud in the fuel filters maybe....

What Vintage is it,..?? if it's got Points, they probably need changin' too...

 

[jcastillo21189]

Re: Engine runs fine until in full throttle wont speed up

I havent done any of that i just bought it but the guy i bought it from gave me paperwork that shown the engine was fully rebuilt about 2 years ago

 

[jcastillo21189]

Re: Engine runs fine until in full throttle wont speed up

thanx welcome to be added to this good boating forum since i am a new boat owner. and im sorry not sure what you mean by what vintage is it.

 

[jcastillo21189]

Re: Engine runs fine until in full throttle wont speed up

Could it be the wrong prop size, i noticed there were people on the back and once they moved to the front it would kick in faster

 

[Bondo]

Re: Engine runs fine until in full throttle wont speed up

I havent done any of that i just bought it but the guy i bought it from gave me paperwork that shown the engine was fully rebuilt about 2 years ago

Ayuh,... Rebuilt has Nothin' to do with Annual Service,....

 

[Bondo]

Re: Engine runs fine until in full throttle wont speed up

thanx welcome to be added to this good boating forum since i am a new boat owner. and im sorry not sure what you mean by what vintage is it.

Ayuh,.... Does it have a Year of manufacture,..?? How 'bout it's Serial number,..??

 

[Bondo]

Re: Engine runs fine until in full throttle wont speed up

Could it be the wrong prop size, i noticed there were people on the back and once they moved to the front it would kick in faster

Ayuh,... Coulda been just Too many people, Period,.... donno...

 

[jcastillo21189]

Re: Engine runs fine until in full throttle wont speed up

Ayuh,... Rebuilt has Nothin' to do with Annual Service,....

i have not done an annual service on it

 

[jcastillo21189]

Re: Engine runs fine until in full throttle wont speed up

I wasnt anywhere close to the limit though