mariner 50 3cyl wont idle runs rough smokes a lot!

adski

Cadet
Joined
Feb 25, 2009
Messages
16
hi,hope some one can shed some light on my problem,
I recently purchased a non-running mariner 50 3cyl (serial no ob125059 can anyone tell me the age?) it wouldnt start,had weak spark,so replaced the stator with a new cdi unit.It now starts but not without applying throttle out of gear,when running it seems to run lumpy and smokes a lot,although will rev smoothely when running.the carbs were cleaned prior to getting it running,could it be simple adjustment? also small fuel leak on bottom carb coming from the bottom of the carb.
also has new plugs and running 50:1 fuel mixture,tank vent open,prime bulb hard.
Any help would be much appreciated
 

Dunaruna

Admiral
Joined
May 2, 2003
Messages
6,027
Re: mariner 50 3cyl wont idle runs rough smokes a lot!

It is a 1987 model, made in the U.S of A.

How were the carbs cleaned? Your motor is running rich, probably caused by gunk being dislodged and plugging up fuel circuits and/or needle and seat.

Time for a full carb strip down and clean (over haul).
 

adski

Cadet
Joined
Feb 25, 2009
Messages
16
Re: mariner 50 3cyl wont idle runs rough smokes a lot!

thanks for your help,had full carb re build and runs sweet now!
 
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