57 evinrude big twin 35 unknown part

[brickster]

I have 2 57 evinrude 35's, 1 electric start, 1 manual. The pull start mod.25028-06194 that I'm in the process of restoring, has a part that I can't I.D., that the electric start doesn't have. It is a round diaphram with a black plastic backing plate on the tiller side of the motor. There is a single vacuum line that leads back to the intake manifold, and 2 wires, 1 ground and 1 that leads to a small module at the end of the tiller handle gear. Can anybody give me more info. on this part. Thanks Brickster

 

[Daviet]

Re: 57 evinrude big twin 35 unknown part

I think what you are talking about is the cut-out switch, look below pages 12 & 13, item # 32.
http://www.marineengine.com/parts/v...ntage-evinrude-johnson/377023/37702300001.htm

 

[brickster]

Re: 57 evinrude big twin 35 unknown part

Thats definately the part, any idea on how it works? Does it have anything to do with overrevving? Thanks for your quick reply, Brickster

 

[Daviet]

Re: 57 evinrude big twin 35 unknown part

Yes, it shuts down a cylinder to prevent a overreving condition. Works off of vacume. Take a look at the breakdown and notice the spring and diaphram, make sure they are ok.

 

[brickster]

Re: 57 evinrude big twin 35 unknown part

Thanks for the info Captain.I shall now proceed with installing an external fuel pump and getting this vintage beauty in the water. thanks Brickster