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Made a post about this awhile back… getting into the restoration of this 1929 N1 Folding Sportwin.
I had an issue where it wouldn’t open up, it would just run at slow speeds.
Checked pistons while I was cleaning up the cylinders, and they seem to be OK.
Not sure what else could be holding it back. Carb has been gone through several times now.
Good spark from what I can tell.
In the photos, the powerhead is positioned in the “up” position, or how it is supposed to be installed.
"Shells sink, dreams float. Life's good on our boat."
1921 Elto Light Twin F
1950 Mercury KF-7
1951 Mercury KG-7
1959 Mercury Mark 6AYou sure those pistons aren’t upside down?
Prepare to be boarded!
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I’m not familiar with this motor, and would need to study the cylinders,
but the pistons appear backwards if the exhaust outlet is on the bottom
of the cylinders.Prepare to be boarded!
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The portion of the piston head with the gradual slope faces the exhaust port. The abrupt notch side faces the intake port.
Joe B
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Wrong way.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
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As others have already said, the pistons are in upside down. As you described earlier, a typical symptom of this condition is that the motor may start but will not rev up and has little or no power.
Given that these motors were worked on by somebody with at least some ambition (if not technical skill) it makes you wonder what they were paying attention to when re-assembling what they ostensibly had taken apart. I can recall at least four motors that I’ve worked on where this condition was discovered, including a 7.5 hp Merc that dated to 1977. It was the worst of the bunch inasmuch as it would not even fire once under any circumstances even though the compression felt acceptable.
Another was this Johnson BN
It was purchased from a collector who apparently knew what he was doing when he worked on motors. I guess anybody can have a bad day. I owned the motor for almost 20 years before I tried starting it. It would run on the stand but would not in the tank. That led me to digging into it to find out why. Looking through the spark plug holes gave the answer in a hurry.
at least it wasn’t a ton of work to correct it
The next day she was out on the lake
https://www.youtube.com/watch?v=REnCyf-_SoA
You’ll get it corrected soon enough I think.
Best,
PM T2He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
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