Johnson Seahorse 5.5

[Lida Rick]

Hifolks , I recently purchased this motor (Johnson 5.5 HP seahorse 1958 cd 15) , the guy told me it is in excellent condition, after doing some research I find its has the original two line cruise a day tank and lines , I have no idea of the gas mix to even test it, looking for any information I can get basically , also any idea of the value of this in perfect running condition , I have photos available if that would help , thanks to all in advance, Jonathan>

For duck hunting I often use my passed down Alumacraft 14 foot jon boat. A few years I purchased a small 4 HP Johnson for pushing my NuCanoe around in the swamp and eventually I started using it on the jon boat.

I measured using a caliper the inside diameter of the bushing. I then marked the stock brass and carefully cut it with a hack saw. After the cut was complete I used a file to remove any burrs from the rod.

I put the new pin into the bushing to check that it correctly fit. Once that was verified I then placed the pin the drive shaft and turned the bushing on the shaft till it lined up into the slot and locked in place.

An important lesson learned from using this motor over the years is to always be prepared to change this pin. I always keep a small multi-tool in my duck hunting blind bag for this reason, you never know when you may need it. As side note, about two days after this I found the bag containing the shear pins. But, hopefully someone in need of a pin will stumble onto this post and be able to make a pin. Till next time.

This reminds me of a story one if my professors in college told the class. He bragged about having a spare shear pin for his fishing boat, he would keep it in his wallet and would proudly show it to you to demonstrate his preparedness.

One day while fishing with a friend of his, he sheared the pin. (I think he was eagerly awaiting this moment.) With certainty and confidence our hero sprang into action. He got the boat close to shore and pulled the prop off. He then dug the remnants of the old key out and promptly dropped it in the water. He then smugly got out his coin purse and retrieved the replacement key only to discover that it was the wrong size! They managed to somehow find the old key and managed to make it sort of fit so that they could get back to the boat landing.

Thank you for putting this write up together. I have a 1969 4 hp seahorse that I recently sheared the pin off. I was actually looking for a replacement pin when I came across your article. Well you saved me some significant coin considering the replacement pin is $45 and 6 rods of 1/8th brass is like $10. One rod will probably make like 5 shear pins. Thanks so much for this!!

With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. I can get it to 2.8 to 3.5 mph trolling speed and it runs a little rough while trolling and if i go any slower it will stall and while trolling i have to hit the choke every 15min or it will stall or as it feels like its gonna stall i throttle up a hair. Any thoughts on whats going on? Just changed the plugs and run non ethanol gas.

Always start with the obvious.... Check all your fuel lines and fittings. Look for dry rot and/or cracks in the lines. Check the connector that goes from your fuel line to the motor, for a few $$ change the fuel filter.

Also had a friend buy a boat w/ the exact same motor & it could not get on plane. They put some marvel mystery oil in and they were plowing water out to their fishing spot & all of a sudden it took off like a bat out of hell& been good ever since.

Get yourself a spark plug light at Harbor Freight. (cheap) Make sure you've got fire on all 3 cylinders. 70's are very thirsty engines. If your using a lot of gas, sounds like you're just not burning it properly.

Check out my post on Tim he's post "help with my 1996 60 horse johnson

I have loads of power and all kinds of problems . Fuel line was the problem.

Good luck

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Have the same engine maybe the same problem ? As posted start with the obvious ! Clean all electrical contacts then apply dielectric grease esp. the bolt that holds the power pack ! When we ran the engine in the dark saw sparks by the power pack , the bolt had backed off just enough to create an intermittent problem ! If not the carbs may have to be rebuilt . A few nobrainers ! Use ethanol few gas and still use a fuel additive , I always filter my gas before putting in the tank .

Check for spark at each cylinder ! I made my own spark tester ; mounted 3 spark plugs on a steel plate bolted the plate to the engine hocked up the coil wires to the plugs [ do not mix them up ] crank the engine , you should see spark at each plug !

Had the same problem with my 115 Evinrude turns out coils were bad. One wasn't firing and another was intermitent. Replacing all 4 to be safe. Thought it was fuel pump, replaced it and decided to throw the coil tester on it. Bingo

If it has good compression it's fine nothing else from overheating would make it run bad. I would not give up. I still sounds electrical and fuel related .

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The lined seahorse, Hippocampus erectus, is a dispersal-limited fish residing in the coastal and estuarine habitats of the Western Atlantic. With sea surface temperatures expected to rise +2C in the next 85 years, these dispersal limited fish will experience varying degrees of short-term (acute) and long-term (chronic) heat stress events. Previous studies have indicated that these different durations of increased temperatures will elicit distinctive behavioral changes in seahorses, but the molecular mechanisms underlying these changes are yet unknown. Three-hundred captive-bred Hippocampus erectus were exposed to control, mild, severe, and lethal temperatures for different durations to assess how these animals respond on a molecular and physiological level to heat stress events. Expression of the genes coding for heat shock proteins (HSPs) HSP60 and HSP70 were quantified to represent the molecular stress response of seahorses exposed to 22C (the acclimation temperature of these animals, and therefore the control), 26C, 30C, and 32C for acute (2, 6, and 10 hours) and chronic (4 weeks) periods of time. Respiratory rates, measured as breaths per minute, and activity levels were recorded daily to show the physiological response of seahorses to increased temperature for chronic durations. The relative expression of HSP60 and HSP70 increased in seahorses exposed to higher temperatures for acute durations as expected, and also increased through the 26C treatment temperature for the chronic duration. There was, however, a noticeable lack of the heat shock response at 30C for the chronic duration, coinciding with a higher mortality rate at this temperature and indicating an inefficiency of the molecular protein-repair mechanisms at this temperature. Respiratory rates also increased with exposure to higher temperature. Seahorses are often used as indicator species of the health of an ecosystem. This research indicates that the relative expression of HSPs are an efficient marker of temperature stress in seahorses only when a large proportion of a population can be sampled.

Marichamy, R and Lipton, A P and Ganapathy, A and Ramalingam, J R (1993)Large scale exploitation of sea horse (Hippocampus kuda) along the Palk Bay coast of Tamil Nadu. Marine Fisheries Information Service, Technical and Extension Series, 119. pp. 17-20.

Menon, N G (1998)Book Review: A Field Guide to the Seashores of Eastern Africa and the Western IndianOcean Islands. Marine Fisheries Information Service, Technical and Extension Series, 157. pp. 24-26.

Vinod, K and Saravanan, Raju and Johnson, B and Murugan, A and Joshi, K K and Vivekanandan, E (2018)CMFRI Marine Fisheries Policy Series No.8; Seahorse resources in India: need for paradigm shift inapproach for sustainable fisheries and conservation. Marine Fisheries Policy Series - 8. pp. 1-106. ISSN 2394-8019

Vinod, K and Saravanan, Raju and Johnson, B and Rajakumaran, P and Sathya, C and Murugan, A and Vivekanandan, E (2015)Participatory management for conservation of seahorses in the Gulf of Mannar, South-eastcoast of India. Technical Report. Bay of Bengal large Marine Ecosystem Project, Kochi.

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