BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   k-bike thermostat substitute? Empty k-bike thermostat substitute? on Wed Sep 18, 2019 11:44 am

NoSprk

NoSprk
Silver member
Silver member
hey guys im trying to do some preventive maintenance on my 93 k1100lt and i noticed BMW wants $75 for a thermostat.

does anyone have a quality substitute for the oem part? thanks


__________________________________________________
'93 K1100LT '91 R100GSPD '73 R75/5
    

2Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 12:58 pm

duck

duck
Life time member
Life time member
What maintenance do you want to do to a thermostat?  If it works then there's no point in replacing it and they seldom fail on K bikes.

I would not mess with it.  It has a rubber sealing ring that you can mess up if you remove the thermostat.


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 1:07 pm

Laitch

Laitch
Life time member
Life time member
@duck wrote:I would not mess with it.
+1 Flush the coolant system then replace the coolant with the appropriate ratio of coolant to distilled water.


__________________________________________________
1995 K75 73,000 miles
k-bike thermostat substitute? Usa-lo10
    

4Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 1:21 pm

Dai

Dai
Life time member
Life time member
Getting that seal in if you remove the thermostat is a real PITA. Been there... Don't worry about it. The thermostat is one of the most reliable parts on the bike.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

5Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 1:26 pm

NoSprk

NoSprk
Silver member
Silver member
Ok Ill leave it alone. New to the bike but when I test rode it the fan kicked on around 3/4 way up and sounded fine. It was almost 100F out that day.


__________________________________________________
'93 K1100LT '91 R100GSPD '73 R75/5
    

6Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 1:45 pm

duck

duck
Life time member
Life time member
Here's how the K1100 cooling system works:

k-bike thermostat substitute? NaggikH

The fan coming on is a good sign. Some bikes that live in cooler climates or sit for a long time will never have the fan come on and the fan seizes from lack of use.  PITA to replace.


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

7Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 3:54 pm

brickrider2

brickrider2
Life time member
Life time member
A flush of the system of my bike is probably a good move.  Should that be done with the thermostat in place?


__________________________________________________
1996 K1100LT
    

8Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 4:26 pm

Laitch

Laitch
Life time member
Life time member
@brickrider2 wrote:A flush of the system of my bike is probably a good move.  Should that be done with the thermostat in place?
Yes and also when it is open.


__________________________________________________
1995 K75 73,000 miles
k-bike thermostat substitute? Usa-lo10
    

9Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 4:52 pm

NoSprk

NoSprk
Silver member
Silver member
Goodluck flushing a cooling system with a thermostat in it. If you removed it then ran the bike it will keep the coolant circulating. As soon as you introduce fresh cold coolant the thermostat will close and keep coolant from flowing.

Remember the job of the thermostat is to maintain a minimum temperature


__________________________________________________
'93 K1100LT '91 R100GSPD '73 R75/5
    

10Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 5:46 pm

Laitch

Laitch
Life time member
Life time member
@NoSprk wrote:Remember the job of the thermostat is to maintain a minimum temperature
The job of the thermostat is to maintain an optimal running temperature—not a minimum temperature. If a minimum temperature is wanted, don't install a thermostat, but that won't help engine performance.

The engine is warmed up before each flushing to allow complete circulation and warmed up after the final filling so the thermostat will open, air can be evacuated and the system can be topped up.


__________________________________________________
1995 K75 73,000 miles
k-bike thermostat substitute? Usa-lo10
    

11Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 5:59 pm

NoSprk

NoSprk
Silver member
Silver member
Not true. If you didn't have a thermostat your engin would never warm up in cold weather. Even when it's hot out the thermostat keeps the engine temp at a minimum. The engine cooling is what keeps the temp from overheating

    

12Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 6:02 pm

NoSprk

NoSprk
Silver member
Silver member
Even if it's 100dg outside the constant flow of the coolant and driving on the highway will not maintain a minimum temp the engine needs to run properly. that's why the thermostat shuts till the coolant is past the desired temp. Engine oil won't get up to temp. The cooling fan is there to cool the coolant in the radiator then it cycles


__________________________________________________
'93 K1100LT '91 R100GSPD '73 R75/5
    

13Back to top Go down   k-bike thermostat substitute? Empty Re: k-bike thermostat substitute? on Wed Sep 18, 2019 6:08 pm

Laitch

Laitch
Life time member
Life time member
There is a difference between the meanings of optimal and minimum that is eluding you. The thermostat and fan keep engine temperature within an optimal range.


__________________________________________________
1995 K75 73,000 miles
k-bike thermostat substitute? Usa-lo10
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum