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Honda motorcycle tachometer repair - Slow to respond
Honda CM400T 1981 - Part of a strip-to-frame restoration project.
With age, a motorcycle's instruments may become sluggish to respond.
This repair will work on both tachometer and some speedometer as well, as long as the gauge is actuated by rotating cable.
If your gauge does not move at all:
1) Disconnect the cable from the engine(tach) or front wheel(speedo) and pull out the long inner cable. Check the entire length of the cable for any defects.
2) Verify the cable is clean, then add grease as it is installed. Make sure it is fully engaged on both ends.
3) Test the gauge. If it still does not respond, then the gauge may be to blame.
After making sure that everything works except the gauge, then you may confidently and CAREFULLY dismantle the instrument and attempt this repair.
I used SuperTech Brake parts cleaner on the rotating joints, making sure not to get any overspray or drippings on the face of the gauge, since the caustic solvent will destroy the markings. With the solvent actively attacking the gummy ol' grease in the joints, I work the mechanism up, down, and around until it felt like it got its act together, then worked it a bit more. I did not add any additional grease or lubricant, as the nylon bushing and remnants of prior lubrication will be plenty.
Then I used a new shop rag wet with water to clean the gauge lens, and lemon scented Pledge furniture polish on both sides of the lens and on the gauge face and needle to make it shine like it's brand-old.