1985 Merc 115 dies at full throtle

[quebec#1]

The engine runs fantastic at high speeds and low and idles and starts up very well.
My only problem is if im cruising around lets say around 5 to 10 mph and hit the throtle it will at times (not always) just bog down to a near idle. If im gradual on the throtle and then pin it theirs no problem.

 

[Laddies]

Re: 1985 Merc 115 dies at full throtle

You have a lean condition either the idle jet settings or the backdrag jets are causing it. I would remove the backdrag jets first and try the engine if that don't help reinstall them and readjust the idle mixture.

 

[quebec#1]

Re: 1985 Merc 115 dies at full throtle

backdrag jets ? Where are they ?

 

[quebec#1]

Re: 1985 Merc 115 dies at full throtle

Still would like to know where the backdrag jets are located ! Any pics ?

 

[Laddies]

Re: 1985 Merc 115 dies at full throtle

item # 10 http://www.ishopmarine.com/ishop/js...cCatFilter=MM&eCatSupFldr=supplier-050-025-MM

 

[quebec#1]

Re: 1985 Merc 115 dies at full throtle

item # 10 http://www.ishopmarine.com/ishop/js...cCatFilter=MM&eCatSupFldr=supplier-050-025-MM

Ok thanks ! But what side effects will this have if i remove them ? Will she run too lean ?
Hey Laddies i was up in your neck of the woods last week Gun lake Michigan.

 

[Laddies]

Re: 1985 Merc 115 dies at full throtle

The backdrag jets are in the float bowl vents at mid range they cause a vacume in the float bowl dropping the fuel level and leaning the engines mid range helping the blubber but at WOT it has no effect

 

[arsenalpsu]

Re: 1985 Merc 115 dies at full throtle

to disable that vent just put a BB in part #11 (vent tube) on that marine.com picture. You may also need to adjust your idle screws, search for the "Link & sync" that clams made. IF you're sinked correctly you might need to move each idle screw out 1/4 turn.