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1Back to top Go down   Temperature gauge K 1100 RS Empty Temperature gauge K 1100 RS on Wed Aug 09, 2017 5:27 pm

ffbikersa

ffbikersa
Life time member
Life time member
Checking if the temperature switch on my '93 K 1100 RS - when the needle reach WHICH point at the temperature gauge / dial should the ventilator fan switch on? As it is a heavy heat wave going on in my part of Europe, this question IS important

Temperature gauge K 1100 RS U1m5rumnQm_qpnjZYvvkzw

    

2Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Aug 09, 2017 6:08 pm

duck

duck
Life time member
Life time member
The temperature gauge has its own temp sensor at the bottom of the oil/water pump and operates independently of the rest of the bike's electronics.

The Motronic (which controls the fan) uses a temp sensor that more closely determines the engine temperature. It is located at the front of the motor and measures coolant temperature right as the coolant exits the cylinder head.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Aug 09, 2017 6:12 pm

duck

duck
Life time member
Life time member
And if you're worried about the engine, if it does start to overheat the overheat light will come on and if it gets even hotter than that then the radiator cap will blow before it gets warm enough to harm the engine. The cooling system pretty much works like that of a car.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down   Temperature gauge K 1100 RS Empty OK but when? on Wed Aug 09, 2017 6:23 pm

ffbikersa

ffbikersa
Life time member
Life time member
Thank you for your answer - only I still don't know when normally (from experience of other owners) does the fan switch one? When the needle reaches the last line before red zone? Or one before?

My buddy who is an expert for bike elctrics was telling me how on K1200 it's normall that the fa starts after needle has already reached the red zone

The bike I own now for 3 months had not been too well maintained so I am still checking everything. I still don't KNOW for sure is the fan working as it should - or the temperature switches

    

5Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Aug 09, 2017 7:29 pm

duck

duck
Life time member
Life time member
There really is no "temperature switch."  The Motronic control unit monitors the engine temperature and controls the fan as well as how much fuel the engine gets, etc...  If your fan isn't coming on then the temperature warning light in the instrument cluster will illuminate.

If you want to hear the fan then start the bike and let it sit and idle until the fan comes on. If the warning light comes on but the fan doesn't then your fan isn't working as it should.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Aug 09, 2017 9:19 pm

RicK G

RicK G
VIP
VIP
The red mark is when my fan comes on. The blue mark is where the temp sits on a normal day 30°C and at the green mark on days that are around 45°C
The fan comes on at 103°C and will cool till the temp goes down to below 100°C so in heavy traffic it will cycle quite often.
Temperature gauge K 1100 RS Image110


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Sun Aug 20, 2017 6:32 am

KiwiK100

KiwiK100
Gold member
Gold member
@ffbikersa wrote:
My buddy who is an expert for bike elctrics was telling me how on K1200 it's normall that the fa starts after needle has already reached the red zone
This is technically incorrect. The fan should come on well before the red zone, about 3/4 of total needle travel. However, there are variances at play as the 1200 cooling system is barely adequate for the job, especially in built up traffic or very hot conditions. Experience as taught me a few things after 15 years and 165,000km's of K1200RS ownership. A major cause of rapid heat buildup is dirty radiators. Biannually I remove the two radiators and soak them before cleaning them by giving them a firm smack onto a flat surface. It is amazing the road crap that accumulates between the fins that is then deposited on the bench! After a good clean the motor will run noticeably cooler and the fans will take longer to engage.


__________________________________________________
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
    

8Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Sun Aug 20, 2017 9:11 am

RicK G

RicK G
VIP
VIP
One thing I found is that if you blow a fork seal the oil will get back into the radiator fins and that makes dust and dirt build up very quickly. I remove the radiator and give it a squirt with degreaser then hose it out. Amazing just how much brown stuff comes out.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

9Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 1:32 pm

brunoresendelopes

brunoresendelopes
active member
active member
In my case, my K1100rs fan turns on immediately after turning the key, even with the bike still off. What tests should I do to see if it is the sensor or Motronic?

    

10Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 6:40 pm

duck

duck
Life time member
Life time member
What year is your K1100RS? How many miles/kms?

Did it just start doing this?

Any recent mods?


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

11Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 6:45 pm

Laitch

Laitch
Life time member
Life time member
@duck wrote:What year is your K1100RS? How many miles/kms? Did it just start doing this?
Any recent mods?
It's a cafe racer project. 1993


__________________________________________________
1995 K75 73,000 miles
Temperature gauge K 1100 RS Usa-lo10
    

12Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 7:57 pm

brunoresendelopes

brunoresendelopes
active member
active member
Mine it’s 1993 and no mods. It’s happened when i start it...

    

13Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 8:09 pm

duck

duck
Life time member
Life time member
Did you replace anything?  If you changed the Motronic (cat vs. non-cat) or swap it the wrong chip then that will cause the fan to run like that.

Is the overheat light in the instrument cluster illuminated?  If so then it might be a chafed temp sensor wire that's grounding somehow.  That will make the Motronic think that the motor is really, really hot and turn the fan on.

What are the last 7 digits of the VIN?


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

14Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 8:20 pm

Laitch

Laitch
Life time member
Life time member
@brunoresendelopes wrote:Mine it’s 1993 and no mods. It’s happened when i start it...
@brunoresendelopes wrote: I'm new owner of K100RS from '90, and cafe racer project is already started !
@brunoresendelopes wrote:My k1100rs don’t have tube . . .
Do you have two motos and one is a cafe racer? Which one is the cafe racer and which one is having the starting problem?


__________________________________________________
1995 K75 73,000 miles
Temperature gauge K 1100 RS Usa-lo10
    

15Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 8:45 pm

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
@brunoresendelopes wrote:In my case, my K1100rs fan turns on immediately after turning the key, even with the bike still off.  What tests should I do to see if it is the sensor or Motronic?
Highly likely its the relay is stuck/faulty. It's in the electrical box under the gas tank.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

16Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Wed Nov 06, 2019 9:00 pm

duck

duck
Life time member
Life time member
Another possibility is that a prior owner added a fan switch that you don't know about. I've made ABS switches that double as a fan switch.  The down position is a momentary switch for the ABS and the up position is a non-momentary switch to turn on the fan.

Look in the relay box.  If there's a non-factory wire tapped into blue/yellow wire to the fan relay then grounding that turns the fan on.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

17Back to top Go down   Temperature gauge K 1100 RS Empty Re: Temperature gauge K 1100 RS on Thu Nov 07, 2019 5:12 am

Ringfad

Ringfad
Life time member
Life time member
We saw this symptom on a k1 last week. Fan came on when ignition was turned on. Turned out that the Motronic connector was not seated correctly.


__________________________________________________
Temperature gauge K 1100 RS Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

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