BMW K bikes (Bricks)

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1Back to top Go down    Jumping fuel and temp gauges on Fri Apr 28, 2017 3:37 pm

club_c

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I have noticed the fuel and temperature gauges on my 88 RS jump and flicker a lot while riding. Remember this bike was in storage for 5 years and I've just recently got it running. Is this typical (I haven't had a K with these gauges before) or is there a connection point I should be considering?


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"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

2Back to top Go down    Re: Jumping fuel and temp gauges on Fri Apr 28, 2017 9:07 pm

RicK G

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With both behaving the same way I would be looking at an earth connection (brown) probably under the tank or the common power connection (green/black) from fuse #1


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Same Problem Almost on Mon May 08, 2017 8:23 pm

TurboBrick

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I have an issue with my temperature gauge jumping around. The bike sat for about 8 years after it had been ran over in a garage Rolling Eyes . The issue is it will get to about (1/2) (3/4) mark and start fidgeting around. It concerns me the bike is getting this hot. I will say when it does reach the red the temp light never comes on and the fan never comes on. Any ideas?

    

4Back to top Go down    Re: Jumping fuel and temp gauges on Mon May 08, 2017 9:10 pm

duck

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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 (K75C fairing, K75 Belly pan, Ceramic chromed engine covers, 32/10 final drive)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
93 K1100RS
94 K1100RS
93 K1100LT
91 K1
93 K75S
http://www.ClassicKBikes.com
    

5Back to top Go down    Re: Jumping fuel and temp gauges on Mon May 08, 2017 9:53 pm

TurboBrick

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@duck wrote: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.
That's good to hear. Thanks for the peace of mind!

    

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