BMW K bikes (Bricks)

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Bikesmith

Bikesmith
Silver member
Silver member
Hey Friends,
    I have a weird one for you. The electrical system on my 1985 K100RS is more or less stock. I did make one change, though: I connected the two leads for the altitude corrector plug to a switch, using the last remaining switch blank in the dashboard (After grip warmer and hazard lights). I even drew a tiny picture of mountains on the switch  Laughing
    I've never had to turn the switch off, as the five years and 16,000 miles I've done with this bike have all been above 3000 feet.
    Here's my question, though. If I do ever go below 3000 feet, should I turn the bike off to flip the switch or just do it on the fly? I've been looking at the wiring diagram and don't see any reason that flipping the switch while riding would hurt the bike in the slightest (I think it would need much more advanced electronics for that), but I'm not positive. So I thought I'd ask. Any thoughts?
    Thanks!
     -Jon


__________________________________________________
Jon
Mechanically competent, electrically idiotic
------------------------------------
1985 BMW K100rs
1940 Royal Enfield WD/CO
1968 Honda CL125
    

Dai

Dai
Life time member
Life time member
The altitude corrector shouldn't be needed below about 10,000 feet, IIRC. Highest I've been was just over 16K on a normally-apirated bike and that struggled badly from about 9K upwards. (Yes we did change the jetting but it still wasn't happy).


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I've had my K75RT over 9,000 feet without the altitude plug and at other times been down to sea level with it plugged in.  I have never noticed a difference in the way the engine ran.  I don't bother with it anymore.

I suspect it's something to do with the emissions and not using it has no adverse effects on the way the bike runs.  I would just ignore it.

As far as operating your switch, I don't recall the manual saying anything about shutting the engine off to install the plug, so I would guess it doesn't make a difference.  You might want to double check your user's manual just to be sure.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down   Odd question for the electrical gurus... Empty I do not know Wed Sep 15, 2021 8:09 pm

caveman

caveman
Platinum member
Platinum member
I can't provide an answer to your question but, have you ever flipped the switch at the elevations you ride? If yes did it change the way the bike ran?
What I do know is that my K75 (92) will not idle very good above 10,000 feet but seems to run fine above 3,000 RPM. Both my K100RT (87) and K100LT (88) seem to run fine up to 15,000 feet. Never tried the plug in on any of them at lower elevations.
Of course none of this is any good to you as I suspect the RS has a different fuel map as the rest of the Ks.

    

robmack

robmack
Life time member
Life time member
You can flip the switch at any time - running or not.  The altitude jumper nearly provides a modified signal to the ECU telling it to enriched the mixture.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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