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Choke Qustion 1970 60 hp

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48tony

Regular Contributor
Hi all.On my 1970 60 hp esl i am in qustion on how my choke should be working.After reading the book it states it can operate in 2 stages 1 useing the toggo at controlls for full choke 2 thermo switch.Last season when i would turn the key to on the choke butterflies would slightly close choking it to start and after a while they would open fully.After a full rebuild on this motor and replaceing the choke thermo switch now the only choke function i have is full choke with the toggo.i have the plunger out a 1/4 inch from choke sillinoid book specks.It starts and runs fine without but i would like to fix it so it works when cold weather comes. I am unsure what the problem is .Could it be the sillinoid ? but the toggo works the sillinoid or bad thermo switch. how do i go about testing to find the problem.
 
Re: Choke Qustion

(Temperature Actuated Choke Solenoid Conversion)
(J. Reeves)
Various OMC engines that were manufactured in the later 1960s thru the early 1970s, for example the 1969 55hp Evinrude/Johnson incorporated a dual stage choke solenoid...... easy to identify as they have two wires leading to the solenoid, one purple/white, one purple/yellow.

The purple/yellow is attached at the engine wiring terminal strip to another purple/yellow wire that led to a heat sensor. The initial stage, with the key ON, (purple/yellow), when cold, would keep the choke pulled in half way until the engine warmed up, at which time it would release and open the choke butterfly.

The second stage (purple/white) is attached to another purple/white wire at the engine terminal strip which leads to the choke switch. When the switch was engaged, the choke closed etc.

The problem with this setup is that as the engine got older, the thermostat acted up, water pump became weak, whatever, the heat sensor failed to operate properly and the choke would not release from that half closed position. This would cause the engine to run in a rich fuel mixture condition (flooding, loading up).

The cure to this problem, via a service bulletin from OMC was to remove the solenoid purple/yellow wire from its original location and connect both of the solenoid wires (purple/yellow & purple/white) to the engine wiring harness purple/white wire at the engine terminal strip.

The above change would allow both solenoid wires to be energized when the choke switch is engaged, pulling the choke butterfly in firmly..... and only when the choke switch is engaged.

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Re: Choke Qustion

Hi Joe thank you for the fast feedback on my choke . I found the problem to be a choke thermo switch purple wire on the wrong terminal screw. after a quick wire change it worked fine.i just moved the purple wire over one terminal screw as the manuale shows. But the info you gave me on this system i am sure it will come into play one of these days.Butt for now it is in working order.Hope all is well.The crank shaft i got from you last year has cought me a lot of fish this spring.my motor runs like a champ.and without this site i would of been lost. Lots of qustions and a lot of good feedback came from this site. a big thanks too all that helped me along on this . Tony
 
Re: Choke Qustion

You really should convert it the way I stated Tony. It is OMC's suggestion via a bulletin. The way you have it setup results in wasting gas.
 
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