Radiator Flush '02 K12RS - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old Sep 30th, 2019, 8:44 am Thread Starter
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Question Radiator Flush '02 K12RS

How often?

Any pearls of wisdom on procedure?
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post #2 of 7 (permalink) Old Sep 30th, 2019, 7:02 pm
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Internal flush? Never been a requirement for me.In over 170K I have never noticed any deposits.Mind you I replace the coolant every year or two with some brand to BMW specs.No nitrites,No phosphates and low sillicates is the spec.

External flush? As in dismount the rads and clean the fins from sand/bug crap and at one time road tar?I have to see through them fins,not take a guess. Pretty well every year or 20-25K.

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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post #3 of 7 (permalink) Old Oct 1st, 2019, 7:18 am Thread Starter
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Makes sense.

The dealership has never done the internal flush.

I was having a problem with coolant burping after a hot ride.

Replaced the radiator cap and hasn't happened since.

The old cap did not have any visible defects though.
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post #4 of 7 (permalink) Old Oct 3rd, 2019, 11:41 pm
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Quote:
Originally Posted by Wildbears View Post
The old cap did not have any visible defects though.
Spring tension has probably weakened some.

Black 2002 K1200RS - "The Beast" (over 100k miles)
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post #5 of 7 (permalink) Old Oct 4th, 2019, 1:50 am Thread Starter
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Forgot to mention the burping was coming from the reservoir overflow tube.
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post #6 of 7 (permalink) Old Oct 4th, 2019, 6:58 am
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Quote:
Originally Posted by Wildbears View Post
...
Replaced the radiator cap and hasn't happened since.

The old cap did not have any visible defects though.
Quote:
Originally Posted by Wildbears View Post
Forgot to mention the burping was coming from the reservoir overflow tube.
These symptoms are fairly common with time / age on the K1200RS/LT , it clearly means the radiator cap is/was defective.

By design, the K1200RS/LT have higher pressure rating radiator cap (21 PSI / 1.5 bar) compare to most Japanese water-cooled motorcycles (16 to 18 PSI). This value of 1.5 is stamped on top of the cap, so make sure this is what you are being offered as a replacement.

ANOTHER IMPORTANT POINT: although the expansion tank (under seat) has a MAX mark, I would suggest to only fill about 1/4 inch above MIN when ENGINE IS COLD and no more. The size of the tank combined with coolant expansion is such that it will overflow when HOT if you use the MAX level. I have tested this on many K1200RS in good mechanical shape with same result...
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
John (Montreal, CANADA)
K1200RS (2002 IceBlue/Red - 96,000 miles)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Last edited by sailor; Oct 4th, 2019 at 7:04 am.
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post #7 of 7 (permalink) Old Oct 4th, 2019, 7:49 am Thread Starter
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These symptoms are fairly common with time / age on the K1200RS/LT , it clearly means the radiator cap is/was defective.
Good to know.

I think the replacement was based on your previous advice.

Thanks again.
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