duck
Life time member
Number of posts : 4462
Your temp gauge is not connected to the ignition system.
The temp relay for the ignition system is connected to a sensor in the aluminum tube coming off the top front of the cylinder head. That is what controls your fan and the red light in the cluster.
The temp gauge has a separate temp sensor at the bottom of the water pump and only feeds that gauge.
I'd check the gauge wiring harness connector under the tank and then the ground to that connector.
It's very hard to overheat a K bike.
First the fan kicks in.
If the fan isn't working and the bike gets too hot then the warning light in the cluster comes on.
If you ignore that and the bike gets even warmer then the radiator cap under the right front of the tank will blow. (Just like a car does.)
If you ignore that then you will harm the engine.
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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
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