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Author Topic: GS 1200 Speedometer acting strangely  (Read 260 times)

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Offline VMAN

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GS 1200 Speedometer acting strangely
« on: April 28, 2009, 10:41:15 am »
While riding down to Greytown with some dogs, the GS's Speedo started acting up.

When I speed up to 100kph, the speedo shows 100kph and the GPS shows 100kph.
Then I slow down to 60, the speedo only goes down to 95 and the GPS shows 60.
Now, I go up to 100 again, the speedo shows 135 and the GPS 100!

Next moment, I look down and I am doing 220kph!!

Swithing the bike on and off a few times, resets the speedo to 0, but then it all starts again.

I do not know what is wrong with the speedo, but now have this theory:

The speedometer aparantly works with a magnet and not a cable.
I had the cable of the GPS wound around the RAM arm, just above the speedo.

Is it possible that this wound cable could be causing a magnetic field which interferes with the GS's Speedo magnet? ???
BMW R1200 GS

Offline JO GSA

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Re: GS 1200 Speedometer acting strangely
« Reply #1 on: April 28, 2009, 10:54:32 am »
I dont know, but I do know you have the fastest GS around  :mwink:
a Great man is known by how he treats people that can't do anything for him.
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It's all good, all of the time.
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Offline Pom

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Re: GS 1200 Speedometer acting strangely
« Reply #2 on: April 28, 2009, 11:53:14 am »
Check that the pick up point isn't dirty, if it's like my bike the pick up counts revolutions
as the two magnets pass on another.
Success is a matter of hanging on, after others have let go.
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Re: GS 1200 Speedometer acting strangely
« Reply #3 on: April 28, 2009, 12:43:58 pm »
i wonder if changing to knobblies will improve the accuracy of my speedo?  at the moment my bike over-reads by about 11%