BMW K bikes (Bricks)

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flyinglow

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I would like to add a car type temperature gauge to my 85 K100 RT, probably an AutoMeter brand. From my reading it looks like I would remove the coolant drain plug and replace this with a temperature sender. The AutoMeter gauges have an American thread temp sender but they offer American to Metric thread adapters. My questions does anyone know what the thread size is of the coolant drain plug? Thanks, Jim

    

Point-Seven-five

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Can't speak to the thread size on the sender, but offer a word of caution. The OEM sender has a blunt tip that does not extend into the coolant passage. Every sender I saw when I was looking to add a gauge had an extended probe.

With the already marginal cooling that these bikes seem to have, I would be careful about sticking an obstruction into the coolant flow path at the pump. I suspect that the probe on the OEM sender was designed that way so as to not impede the coolant flow.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

92KK 84WW Olaf

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Good point there on the obstruction.

I changed out the temperature sensor behind the rad and it looked like it did not extend into the waterway either, its got a little header pipe of its own so it doesn't obstruct the waterway.....and fills with crud.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

Inge K.

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@flyinglow wrote:does anyone know what the thread size is of the coolant drain plug?

M10x1.0


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

5Back to top Go down    Metric Coolant Plug adapter on Thu Oct 26, 2017 11:44 am

flyinglow

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Thanks, it looks like AutoMeter has an adapter, Metric Adapters pn 2265. I will also be aware of the possible obstruction due to sensor length. jim

    

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