1974 Mercruiser 140 4 cyl

[EEOCRAM]

Idles fine in the driveway and on the water. Give it full throttle and it sputters and backfires from the carburater. Won't go over 10 mph. I changed the points, condenser and plugs. Put HEET in the gas tank with new fuel and stabil. Sprayed carb cleaner in the carb and still have the same problem. Should I replace all fuel filters and fuel pump?

 

[JB]

Re: 1974 Mercruiser 140 4 cyl

Howdy, EEOCRAM.

Welcome to iboats.

First lesson: Mercruiser is not an outboard, it is an I/O.

Moving this.

 

[Don S]

Re: 1974 Mercruiser 140 4 cyl

When you installed the new parts, did you confirm the point dwell, then check the timing, then readjust the idle mixure and idle speed?
Spraying carb cleaner on and in a carb makes it look nice, but does nothing on how it works.

 

[Bondo Again]

Re: 1974 Mercruiser 140 4 cyl

Should I replace all fuel filters

Ayuh,....

That's the 1st thing I'd do....

 

[EEOCRAM]

Re: 1974 Mercruiser 140 4 cyl

1st I don't see where I indicated mine was an outboard. 2nd found out that the ignition wires were not hooked up correctly. Once I fixed, set the points at .022 ,cleaned the carb, put in some HEET and stabil, took out on the water worked like a charm. Very happy, going fishin in the mornin. Stayin on the river all day. Just got the boat last Friday.

 

[Bondo]

Re: 1974 Mercruiser 140 4 cyl

1st I don't see where I indicated mine was an outboard.

Ayuh,...
I gotta Guess that JB found your thread in the Mercrury Outboard forum,+ moved it here to the I/O forum.....

2nd found out that the ignition wires were not hooked up correctly.

Well,..... We can only Assume that you know what you're doing,+ Did it Right....
With the Info provided by yourself,... You got some Very reasonable Answers.....

Very happy, going fishin in the mornin. Stayin on the river all day.

Ayuh,...... Good Luck Fishin',...