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K100-forum.com » Technical, repair and troubleshooting » Electrical » Adding a AutoMeter Temperature Gauge to K100RT

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flyinglow

flyinglow
Silver member
Silver member
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

Point-Seven-five
Life time member
Life time member
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.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

92KK 84WW Olaf

avatar
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Life time member
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.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Inge K.

Inge K.
VIP
VIP
flyinglow wrote:does anyone know what the thread size is of the coolant drain plug?

M10x1.0


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

5Back to top Go down   Adding a AutoMeter Temperature Gauge to K100RT Empty Metric Coolant Plug adapter Thu Oct 26, 2017 3:44 pm

flyinglow

flyinglow
Silver member
Silver member
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   Adding a AutoMeter Temperature Gauge to K100RT Empty Water Temperature Meter Sender Sun Mar 04, 2018 10:40 pm

flyinglow

flyinglow
Silver member
Silver member
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.

Adding a AutoMeter Temperature Gauge to K100RT 62161411


  Adding a AutoMeter Temperature Gauge to K100RT 62161410

    

Inge K.

Inge K.
VIP
VIP
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.


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

Point-Seven-five

Point-Seven-five
Life time member
Life time member
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: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

9Back to top Go down   Adding a AutoMeter Temperature Gauge to K100RT Empty Water Temperature Meter Sender Mon Mar 05, 2018 5:10 pm

flyinglow

flyinglow
Silver member
Silver member
Super, Thanks for the pn correction.

    

KiwiK100

KiwiK100
Gold member
Gold member
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:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
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 Grandads ride
    

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