86' mercursier top end problem

[LMAA]

Hi,
I have a 140 hp Mercursier I/O. When I'm at top end the motor wants to cut out. Once I bring it down to around 35 Rpms it runs OK. I have had it running at 42 Rpms at the top end.
I rebuilt the carb, new points and condensor, new plugs and wire and cap.

Anybody have an idea what is wrong?

Thanks,
LMAA

 

[SpinnerBait_Nut]

Re: 86' mercursier top end problem

LMAA, welcome to iboats.
Let's get this to the Mercrusier/Volvo/OMC I/O and Inboard engine forum.

 

[Bondo]

Re: 86' mercursier top end problem

Change the Fuel Filters.......

 

[LMAA]

Re: 86' mercursier top end problem

HI,

I saw later I made the mistake under the wrong forum, but I couldn't fix it.

I replaced the filter in the carb already, didn't see any other filter in line. Is there one in the tank?

Thanks in Advance,
LMAA

 

[xltier]

Re: 86' mercursier top end problem

unless its been removed already,there should be a ball and spring in the line coming out of the tank.anti siphon valve i believe its called.thet get plugged up from time to time.when mine did it there was no top end.hth

 

[Rev.]

Re: 86' mercursier top end problem

main problem i read in your post is " points and condenser", i put an electronic ignition in my friends big block V Drive. he said its more reliable and it never ran 4500 RPM WOT before, use to only get 3200. try it you might like not have to worry about points ever again.

 

[LMAA]

Re: 86' mercursier top end problem

Just found a filter on top of the pump, looks like it has been there awhile. I'll get a replacement and try it out.

Thanks Everybody !