BMW K bikes (Bricks)

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1Back to top Go down   New post. Long absence Empty New post. Long absence Mon Oct 13, 2014 8:46 am


Silver member
Silver member
Wasn't sure where to post this but here seems as appropriate as any.91 K100RS 16 valve

After almost two years of no 2 wheel rides, I am back on the bike. Truck is down and the fever has reemerged.
New battery and it runs. Then the problems begin.....
False neutral no starts. Head light go's out under 1500 rpm. Blinkers crazy and no self cancel. Sputtery.
Found if I tapped end of starter all would be good for a second or two.

I couldn't find it during my ill tempered , impatient search but recalled a post from one of the forum heroes discussing the fact that K's ground through the starter.
Pulled tank,  comp, battery and box and starter. Dismantled starter and cleaned. Brushes looked good. Lot of black carbon looking crud in both ends. Went through ground on frame under tank, at starter and trans next to starter. About two & a half hours.

Lights are perfect now. Blinkers work and self cancel. Fan still doesn't come on but cool enough as long as I don't idle too long. Rig a switch later. (Fan switches through "brain" ground. Another great bit from a reg here.)

When I came back here to look for starter info, I saw many having similar problems and thought this might be helpful. 
Also mainly wanted to thank the regs for so much good information and a source that has kept me running many, many times.



2Back to top Go down   New post. Long absence Empty Re: New post. Long absence Mon Oct 13, 2014 9:56 am


Life time member
Life time member
Great to hear that the wealth of knowledge on this forum continues to have benefits for people, as it has for me.

Thanks for sharing the goods news about the resurrection.



1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original

3Back to top Go down   New post. Long absence Empty Re: New post. Long absence Mon Oct 13, 2014 10:32 am

Two Wheels Better

Two Wheels Better
Welcome back, and thanks for the freshen up post about the starter motor often being the culprit in a lot of 'electrical gremlin' posts. As It's been said before many times, starter motor maintenance outta be a requirement at 25,000 mile intervals. It cured my old K's electrical weirdness when I first bought it. That's just one of the things I like about these bikes; they have very identifiable issues that are relatively easily fixed, and they go on and on and on, like many of the posters here on the forum, myself included.


1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, #1 '06 K1200R, #2 '06 K1200R, '07 K1200R, '09 K1300GT, '13 R1200RT-P & 2022 S1000XR

All of life is a foreign country. - Jack Kerouac, author (1922 - 1969)

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