A Question About Operating Temperature (for peace of mind) - BMW K1600 Forum : BMW K1600 GT and GTL Forums
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post #1 of 11 Old 07-10-2019, 08:04 PM Thread Starter
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Thumbs up A Question About Operating Temperature (for peace of mind)

One negative thing about keeping up on our forums is that many ideas have been planted in my head that I don't want to think about.

Such as operating temperature.

I comprehend there are numerous variables that influence operating temperature on our machines and would hate to think about one of you fine people spending a lot of time educating me on the variables when I feel I have a strong understanding of them.

My simple questions, and simple replies are appreciated.

1. What should the Normal/Idle operating temperature be approximately? (Fahrenheit) - I understand the variables - just looking for a range of temperatures to compare mine to

2. What is a concerning/begin to ride differently operating temperature? ""

3. What is a red-lined/dangerous/ pull over immediately / bike will turn off soon operating temperature? ""

Please.


Recently during two days of high temperatures (85 degrees F) with close to 100% humidity
My bike was operating around 7/10 bars on the temperature gauge
and the operating temperature was between 80-86 degrees F

Never really concerning myself with these thoughts before
but gearing up for a few 1,000-5,000 mile trips
I think I need peace of mind about these temperatures

I scanned the owners manual
I called my local dealer and discussed these things with the mechanic
but he never really focused his responses on the 3 questions above

Thank you in advance for your breadth and depth of knowledge

Please remember don't blow your fingers out or break your back typing responses

straight #s are good too

There is thy gold, worse poison to men's souls,
Doing more murders in this loathsome world,
Than these poor compounds that thou mayst not sell.
I sell thee poison; thou hast sold me none.

Last edited by PLAGUE; 07-10-2019 at 08:07 PM.
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post #2 of 11 Old 07-10-2019, 08:56 PM
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My '18 GTL with Nav VI gives digital water temp.

The thermostat keeps it at 187 no matter how cold outside. Winter runs it stays at 187.

Summer hot day (100 degrees) at highway speeds it'll go to about 205

Hot day and a red light kicks the fan on at 221.

I've seen 230 in rush hour traffic but never higher. Still 7 bars I think.

I don't know where the light comes on but shut it down if you see it.
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post #3 of 11 Old 07-10-2019, 09:26 PM
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So do you have these same thoughts and concerns when driving your automobile? I'm glad my 2016 bike doesn't have an actual coolant temperature gauge just the bar graph. Sometimes too much information is well just too much information. I remember the old days of riding air cooled bikes and these thoughts never came up.


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post #4 of 11 Old 07-10-2019, 09:39 PM
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On our last round trip from SoCal to South Dakota (3700 miles), the norm was 5 bars most of the time. If we pushed the bike hard in 90-105 degrees, or if we rode consistently high RPMs in lower gears, we'd hit 6 bars.

In summary, 5 bars for 'normal' riding, and 6 bars for more extreme temperatures/riding. The only time I saw 7 bars was idling in higher temperatures.
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post #5 of 11 Old 07-10-2019, 09:50 PM
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Here in the hot south my Nav VI has never shown the bike temp to have exceeded 210 degrees: Stop and go traffic, 95 degrees and 90% humidity. Fan comes on at 7 bars. After spending all day doing parking lot cone maneuvers a few weeks ago in similar conditions with no issues overheating, I don't even watch it anymore.
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post #6 of 11 Old 07-10-2019, 11:24 PM
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Several threads about this issue here on this forum. Many of us have experienced the dreaded "Red Triangle". Most recently for me on my last trip to Alberta at the beginning of June. With very cool temps and snow flurries occurring, I showed 7 sometimes 8 bars. My issue turned out the be the back side of the radiator was very dirty. I try to keep the front of it as clear as possible, but when you don't see the back of it, the old saying "out of sight, out of mind" presents itself in a negative way. It got so bad, I had the bike towed the last 50 miles to my local dealership. When I picked it up, it was 5 bars for my 50 mile ride home. I stopped to get fuel and was caught up by lots of traffic, high ambient temps and two long signals. The gauge went to 8 bars and as soon as I got rolling again to freeway speeds, it was back to 5 within two minutes. As others have noted in these different threads, the key is keeping that radiator clean.

I was assured by two service writers in Colorado that the red triangle is certainly a warning but not a fatal occurrence. They said the bike will shut down prior to any damage being done to the engine.
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post #7 of 11 Old 07-11-2019, 02:32 AM
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Thermostat controls to 85 C (185F) on the road under almost any conditions when the bike is moving.
Fan comes on at 105C (221F) and turns off at 95 C (205F).

Never had the K1600GT exceeding these ranges.
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post #8 of 11 Old 07-11-2019, 05:46 AM
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Never seen more than 7 bars, and thatís in an Aussie summer, 110+ days... but I should add there was not stop start traffic
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post #9 of 11 Old 07-11-2019, 08:43 AM Thread Starter
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@Arizona Jim

Amen Brother!

There is thy gold, worse poison to men's souls,
Doing more murders in this loathsome world,
Than these poor compounds that thou mayst not sell.
I sell thee poison; thou hast sold me none.
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post #10 of 11 Old 07-11-2019, 08:12 PM
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I like the data.
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