EVINRUDE CARBURETORS

Joined
Mar 26, 2022
Messages
11
I'm New to this forum but I hope someone can help, I have a 1987 Evinrude Outboard 40 model E40TLCUD my problem is I would like to get rid of my fixed idle air jet carburetors and replace them with idle adjust carburetors, The carburetors I have are junk, Does anyone know if I can replace the mine with newer model carbs any help would be much appreciated.
Thank BILL
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,819
Explain how you determined your carburetors are junk?------How did your motor run last season ?----Or were they full of water and all corroded ?----Damaged by a previous owner ?-----If motor does not run nicely what trouble shooting was done ?
 
Joined
Mar 26, 2022
Messages
11
Thanks for the reply,
Damaged by a previous owner, Carburetors apart when I got the motor rebuilt both carbs new everything including all orifices, Carbs were dip and cleaned engine stilled ran bad no idle , Told to try several things one is To determine which carburetor is bad have the engine running at the problem rpm and stick a couple fingers into the carburetor throat (acting as a manual choke). When the engine smooths out and the rpms increase, you've found the offending carburetor, Which is what I did and rpms increased, 2 is remove a spark plug wire which I did and this is what happened, At idle removed top spark plug wire and engine stopped running removed bottom wire engine continued running, Then I switched carburetors ( bottom to top and top to bottom) Pulled top plug wire engine continued to run pull bottom wire engine stopped running.
OK - Here's what I've done.
- Kitted the carbs & fuel pump
- Replaced all the fuel lines with clear ones can see good fuel flow.
- Link & Sync'd As best I know how.
-New spark plugs .040 gap)
- Tested spark (good 7/16 or better arc)
- Compression check =140 psi top and bottom.
I'm complete done with the carbs and basically I would like to switch to the carburetors that have a idle screw and are new
Thanks BILL
 
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