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 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 67,600 miles
    

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

    

6Back to top Go down    Water Temperature Meter Sender on Sun Mar 04, 2018 6:40 pm

flyinglow

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On the K100LT they had a Temperature Meter. On the BMW parts fiche they show it under the Additional Instrument section. They show the meter connection to a Temperature Sensor, pn 11531460287. Does anyone know and have a picture or manual picture of where this sensor is located on the engine? I've checked the two manuals I have and cannot find it's location.




    

Inge K.

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It replaces the coolant drain plug.

The picture in your post is correct.
The part number is wrong, it's for the coolant stub on the cylinder head.
Correct part number is 62 16 1 459 270.


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

Point-Seven-five

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The temperature sensor goes in the coolant drain hole in the water pump at the lower front of the engine. If the sensor is not used, there will be a hex head plug in the port.


__________________________________________________
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
    

9Back to top Go down    Water Temperature Meter Sender on Mon Mar 05, 2018 1:10 pm

flyinglow

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Super, Thanks for the pn correction.

    

KiwiK100

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Remember that the gauge must be suitable to work with the BMW sensor. You can pick up an original gauge for about 60.00 secondhand and your K100 has the location for it from factory. Depending on the year of your bike, most of the wiring is in the harness too, so it is pretty much plug and play. You will need the wiring from the sensor that runs up to the harness under the tank. Not sure what year the harness had the wiring included, but my '87 RS has it.
Motorworks UK website will show all the bits you need and all available secondhand. Also have a look at the parts fiche in MAXBMW
MAX BMW Motorcycles - BMW Parts & Technical Diagrams - K100RS (K589)
Motorworks BMW Motorcycle Specialists - Shop - Spares and Accessories


__________________________________________________
Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 167,000km
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles.
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grand dads ride
    

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