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1975 evinrude 85hp one more question

T

thellcon

New member
"The manual I bought gives no

"The manual I bought gives no mention to the electric choke. This model has the two purple wire electric choke not the primer. When the key is first turned to the on position (with the choke off) the choke activtes slightly to about 1/8 closed, is this normal? When you hit the choke switch it closes tightly and evenly, I just question why this initial automatic movement is occuring and does this than open fully when the engine is running? When the key is off the choke is wide open."
 
"on those older engines it may

"on those older engines it may be agood idea to remove the purple coming from sensor just leave the one on that works when you push the key make sure to protect the removed wire tape? there is a service bull, on this prob"
 
"(Temperature Actuated Cho

"(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.

When time permits, visit my store at: http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
 
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