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Noticed today on my 1983 CX650C that at around 70 mph, the rpm gauge needle fluctuates 500 rpm and the speed gauge needle fluctuates 4 mph while the engine and speed appear steady. Vibration is normal. Noticed this on backroads and on interstate. Motorcycle and engine have been operating perfectly.

Anyone ever seen this happen? I have not started troubleshooting it yet.
 

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my 1982 gl500 was doing that when I first got it I lubed the cables and it has been fine ever since.
 
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