Topic: 1955 25HP Evinrude: How can I block off these ports?

This topic has 15 replies, 10 voices, and was last updated 2 years, 9 months ago by garry-in-michigan.

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July 27, 2021 at 6:26 pm #243755
mr-asa
Participant
#43 and #45 on this diagram. #43 is easy, that’s pressure line for the gas can which I’m not using. I’m using an external pump so I don’t need the pressure from #43, but I also don’t need it spitting air-fuel mix everywhere. Can I just connect the two?
- This topic was modified 2 years, 9 months ago by mr-asa.
July 27, 2021 at 8:30 pm #243770
crosbyman
Participant
Canada Member - 2 Years
just install short piece of fuel hose on the air pressure nipple and insert (screw) a short bolt in it to seal it and install tye wraps to hold everything in place

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- This reply was modified 2 years, 9 months ago by crosbyman.
- This reply was modified 2 years, 9 months ago by crosbyman.
July 29, 2021 at 9:11 am #243850
fleetwin
Participant
US Member - 2 Years
I’m confused, why are there two nipples on the intake manifold? Is one of them for the cut out switch??
July 29, 2021 at 9:31 am #243852
crosbyman
Participant
Canada Member - 2 Years
possibly… a vacum is needed … I modified my comment o the air pressure nipple

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July 29, 2021 at 10:36 am #243859
David Bartlett
Participant
US Member - 2 Years
Don is correct. One is for the vacuum switch.

David Bartlett
Pine Tree Boating Club Chapter

"I don't fully understand everything I know!"
July 29, 2021 at 10:37 am #243860
mr-asa
Participant
What vacuum switch?
July 29, 2021 at 10:46 am #243862
David Bartlett
Participant
US Member - 2 Years
Evan,

On the 1954 motors there is a vacuum switch that shorts one set of points if the motor “runs away” in neutral. I think the 1955 motors had one also.

David Bartlett
Pine Tree Boating Club Chapter

"I don't fully understand everything I know!"
July 29, 2021 at 1:23 pm #243882
Mumbles
Participant
mr-asa wrote:

What vacuum switch?

This one. The motor will run just fine without it but it is there to prevent a runaway situation.
July 29, 2021 at 1:35 pm #243888
mr-asa
Participant
Ahh. Is a runaway condition in these something you have to worry about regularly?
July 29, 2021 at 4:04 pm #243898
outbdnut2
Participant
US Member
I’ve seen this switch kick in if a motor gets rev’d too high in Neutral.
Dave
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