1987 Johnson 28HP Idle Issue Please HELP!!

captTmann

Recruit
Joined
Jan 24, 2011
Messages
5
Alright This is what it is so far. I have Replaced all fuel lines, Rebuilt/Cleaned Carb 2x, Rebuilt Fuel pump, Installed Inline Fuel Filter and I cannot seem to get it to Idle. Compression is Even, Good Spark on Both Plugs. I Have racked my brain with this for awhile and cannot seem to figure it out! The motor Starts and Runs with the throttle advance lever up however when you put the lever down for normal idle/operation it dies Immediately when cold and will run for a few minutes when warm and then sputter and die. Good gas in the tank.... Motor Bogs down when sprayed with carb cleaner while running... I'm at a loss Im not sure what else to try. I have adjusted and readjusted the "low speed Needle" to no avail.... Any suggestions?


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Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 1987 Johnson 28HP Idle Issue Please HELP!!

When you cleaned the carb, did you remove the core plug on top of the carb and clean the passages in there?
The static setting on the low speed needle is 1 1/4 turn out from lightly seated. Does turning the low speed needle all the way in make any difference?
 

captTmann

Recruit
Joined
Jan 24, 2011
Messages
5
Re: 1987 Johnson 28HP Idle Issue Please HELP!!

Yes I removed all welch plugs and cleaned passages. I have tried the 1 and 1/4 turn out from lightly seated to no avail, Turning the low speed in does nothing turning needle to about 5 turns out seems to give the best response.
 
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