Merc. 7,4 power problem

[Sailor78]

Hi... first sorry my english is not so good..... i have a Bayliner 3488 with to Mercruiser 7,4 thunderbolt.. the sb engine runs with 700 rpms lower than the bb engine, it also smoke black in neutral gear position, i have replaced the fuel filter.. it feels like its tired, compared with the other engine.
im not sure its running on all cylinders, where shall i start searching for faults.... please help me

 

[Bondo]

Re: Merc. 7,4 power problem

it also smoke black in neutral gear position, i have replaced the fuel filter..

Ayuh,.... Sounds like the Carb needs Rebuilding....

 

[Sailor78]

Re: Merc. 7,4 power problem

Thanks... what do you think about an ignition problem?

can the carb. result in black smoke

 

[Bondo]

Re: Merc. 7,4 power problem

can the carb. result in black smoke

Absolutely.... That's exactly Why I said what I did.....

A Full,+ Complete Service,+ Tune-Up is Always a Great Idea too...

 

[Sailor78]

Re: Merc. 7,4 power problem

Thanks very much. i will try that

 

[Bondo]

Re: Merc. 7,4 power problem

Thanks very much. i will try that

Hi... first sorry my english is not so good.....

Ayuh,... Ya did Great talkin' to this ole Redneck,.... Where ya From,..??

Good Luck...

 

[Sailor78]

Re: Merc. 7,4 power problem

Im from Denmark