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Recent content by Gshell422

  1. G

    Nissan NS5B questions

    HELP! I finally did a complete carburetor soak and rebuild. There was no change. I took the digital tach down for another sea trial. Max RPM while in neutral was around 6500 RPM, but when put in gear tied to a dock, max RPM never got above 3500. When operating in a barrel at my garage, max RMP...
  2. G

    Nissan NS5B questions

    I am starting to suspect that this is essentially how this engine operates. Part of my confusion is what appears to be a non-linear throttle. The throttle rotates through roughly 1/4 turn of the handle. From minimum throttle to what is marked as the starting position is about 1/8 of a turn. I...
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    Nissan NS5B questions

    Since the motor has full power when the grommet on the side of the drive shaft housing is removed allowing the exhaust gas to exit above the water line, I dropped the lower unit to inspect the interior for possible blockage. All was as clean as a brand new motor. I did some more sea trial...
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    Nissan NS5B questions

    Another observation. When runniing in neutral, the prop rotates moderately in the reverse direction. I don't know whether that is a normal operating thing or an indication that something is not right.
  5. G

    Nissan NS5B questions

    Thank you. Another dead end path. The plot thickens. Today I cleaned the carburetor main jet. Not particularly dirty but I did it anyway. Another sea trial on the inflatable and no change. Runs great but does not seem to reach full RPM. In yesterday's sea trial, it did seem to momentarily rev...
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    Nissan NS5B questions

    I was told by a service technician that the engine has an overheat protection system that limits the motor power if it is getting hot and that the water flow from the flush port attachment could be making the engine hot enough to limit it's power. I have added a plug to the flush port attachment...
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    Nissan NS5B questions

    I recently got a new-to-me Nissan NS5B. It looks to be in excellent shape, but I have a few questions. It has been in storage for several years. It has a flush port hose attachment. When operating in water, there is a steady stream of water coming out of the hose attachment. Water is also...
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