BMW K bikes (Bricks)

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1Back to top Go down    Summer thermo for K100RT? on Mon Feb 22, 2016 4:38 pm

SniperX

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Wondering if there are different temp thermos for these bikes. Whats stock and what is available?


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

2Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:08 pm

duck

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Why would you want to run a different thermostat then the one the bike was designed to run with?


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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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:11 pm

Kyle10

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Yeah, K's get nearly unbearable hot in summer stop-n-go traffic.

Instead of thermostats, consider upgrading your rad fan. It's easy and the replacement is a galaxy better than the OEM of thirty years ago.

http://www.k100-forum.com/t8728-overheating-88-k100rs. Scroll down for the words 'Spal puller fan.'


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1985 K100rt 0052183
1983 Honda VF750 007713
    

4Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:40 pm

SniperX

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@Kyle10 wrote:Yeah, K's get nearly unbearable hot in summer stop-n-go traffic.

Instead of thermostats, consider upgrading your rad fan. It's easy and the replacement is a galaxy better than the OEM of thirty years ago.

http://www.k100-forum.com/t8728-overheating-88-k100rs. Scroll down for the words 'Spal puller fan.'
Good advice, I was going to do that actually if it is warranted. Seems to be eh?


__________________________________________________
1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

5Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:41 pm

SniperX

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@duck wrote:Why would you want to run a different thermostat then the one the bike was designed to run with?
Due to what Kyle says after your response....exactly that mate....


__________________________________________________
1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

6Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:44 pm

duck

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When you are riding the airflow and the thermostat control the heat.

When you are stopped and the engine heats up the rad fluid, the fan kicks in to cool it down.

I think more productive mod would be to add a fan switch.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

7Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:50 pm

SniperX

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@duck wrote:When you are riding the airflow and the thermostat control the heat.

When you are stopped and the engine heats up the rad fluid, the fan kicks in to cool it down.

I think more productive mod would be to add a fan switch.
Even easier, which I was going to do as well. I think I'll add the switch and see how that goes before messing round with the fan.


__________________________________________________
1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

8Back to top Go down    Re: Summer thermo for K100RT? on Mon Feb 22, 2016 5:55 pm

duck

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Or add more insulation under the tank.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

9Back to top Go down    Re: Summer thermo for K100RT? on Sun Mar 06, 2016 10:23 pm

SniperX

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@duck wrote:Or add more insulation under the tank.

Where can I get that insul, and what kind is it?


__________________________________________________
1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

10Back to top Go down    Re: Summer thermo for K100RT? on Sun Mar 06, 2016 11:34 pm

Point-Seven-five

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You can get it at Home Depot. Goes by the name "Reflectix".


__________________________________________________
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
    

11Back to top Go down    Re: Summer thermo for K100RT? on Mon Mar 07, 2016 10:46 am

Holister

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@SniperX wrote:
@duck wrote:Why would you want to run a different thermostat then the one the bike was designed to run with?
Due to what Kyle says after your response....exactly that mate....
A different thermostat won't make the engine run cooler in hot conditions. Its function is only to restrict coolant flow when the engine is cold so that it reaches operating temp quicker. Once at op. temp the thermostat is fully open. It can't provide more coolant flow than that.

Ensuring your thermostat is working properly would be a good start.
Air leaks will lean the fuel mix making the engine run hotter.
Adding insulation under the tank will help to keep the fuel temp down and prevent some of the heat flowing up to the rider.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

12Back to top Go down    Re: Summer thermo for K100RT? on Mon Mar 07, 2016 7:40 pm

RicK G

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To make your cooling system more effective you need to make the radiator surface area larger and make the air flow across that area better. The early K100 83 and 84 had a 3 row radiator where the later models have a 2 row. Try to get one of those, they are still around and many are in good condition if the right coolant has always been used.
I have a 3 row on my K1100 and it still gets hot very quickly on 40C plus days but when the fan comes on it cools much quicker. When the hot days do occur I run my standard fan all the time when in heavy traffic as that prevents the engine getting to the overheat situation when the fan will cut in. I have found that the more the standard fan works the less likely you are to have trouble with it. I will also replace the fan with a much better more modern unit if it does fail.
This is a 3 row bit pricey but http://www.ebay.com/itm/BMW-84-97-3Bank-RADIATOR-Intercooler-K100RS-K100LT-K1100RS-K1-K1100LT-K75S-K75RT-/380824402272?hash=item58aae73960:g:JVIAAMXQlgtS4AOH&vxp=mtr
I think this is also a 3 row but hard to tell http://www.ebay.com/itm/BMW-Radiator-K100-BEHR-/370786911333?hash=item56549f4465:g:iHQAAMXQlUNRVOKx&vxp=mtr


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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