Merc 120 stalls on acceleration

S

ShihanRocco

Cadet
Joined
Nov 3, 2005
Messages
18
Greetings all.......

1986 merc 120....new points, plugs, wires, rotor etc......ran fine last week, this week it idles rock solid, but when you try to accelerate it sputters than stalls.....it will start right back up but will not take the gas and dies.


any help would be appreciated

thanks in advance
 
Bondo

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,513
Re: Merc 120 stalls on acceleration

Ayuh,.....

Rebuild the Carb.......
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Merc 120 stalls on acceleration

You did get the dwell and timing reset to specs after the tuneup didn't you?
And you did readjust the idle mixture didn't you??
If yes to those questions, like Bond-o says, rebuild the carb.
 
45Auto

45Auto

Commander
Joined
May 31, 2002
Messages
2,842
Re: Merc 120 stalls on acceleration

Check for water in the fuel filter and carb. If you're real careful and lucky you can probably get the top of the carb off (8 screws I think) and re-use the gasket. Had a 1980 120 last week that did the exact same thing. It had water in the fuel filter, and when the top of the carb was removed there was 1/8 inch of water in the bottom of the carb. It idled great, but died when you tried to accelerate, then would crank right back up and do the same thing. Was great for NO WAKE zones! Cleaned the water out of the carb and everything was perfect after that.
 
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