BMW K bikes (Bricks)

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1Back to top Go down    Trying to get bike started? 1985 k100 on Thu Oct 04, 2018 12:53 pm

drrm123

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Hello I bought a bike from towing company lien sale. And I'm trying to get it started. Looked through some post with no start issues, but wanted some help on my specific problem. Had locksmith to make key which only goes to 1 position not 2. I'll take care of key problem with him later. So I short red and green wire to get oil, battery and neutral lights. On and off red switch is in middle position. Push green starter button but get nothing. Horn, signals, button to cancel signals, hi and low beam button work. All fuses are ok. Battery voltage on all fuses except 1, which is fuses 5 or 6. Counting from top to bottom. Not at home now to check. Pulled fuel tank, connector from right hand control has brown wire which i believe is from the start button. I see resistance change with multimeter connected at 9 wire plug/connector under tank when the start button is pushed. Not sure if that is the same wire on starter relay under seat the large black one with 2 heavy wire and plug on the side with brown/red wire and black/yellow. Also I can short the two heavy wire and starter cranks engine over. Wondering where to look next? Will get a service manual later. But don't want to invest too much money or time until I verify the bike runs. Thanks for any help. I think the bike is a base model also. And I also swapped the 2 blue relays.

    

2Back to top Go down    Re: Trying to get bike started? 1985 k100 on Thu Oct 04, 2018 1:03 pm

duck

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Black/yellow wire from right combo switch getting 12V+ from the start button is what triggers the starter relay.

Is the green N indicator in the cluster illuminated when the bike is in neutral? †That circuit sends power to the start button.

Trying pulling in the clutch lever as that is the other way to get power to the start button.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Trying to get bike started? 1985 k100 on Thu Oct 04, 2018 1:56 pm

drrm123

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I'll check the black/yellow wire this evening. I tried pulling the clutch lever in. And with the side stand up and down. Still starter would not turn over. Someone posted a wiring diagram I'll try to find that post and look at it again. Yes the green indicator is lite while in neutral.

    

4Back to top Go down    Re: Trying to get bike started? 1985 k100 on Thu Oct 04, 2018 7:50 pm

92KK 84WW Olaf

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85 K100 will not have a sidestand switch.

If you are getting nothing also check the plug on the fuel injection control unit FICU under the seat, make sure its correctly seated.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

5Back to top Go down    Re: Trying to get bike started? 1985 k100 on Thu Oct 04, 2018 8:32 pm

RicK G

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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."† from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

6Back to top Go down    Re: Trying to get bike started? 1985 k100 on Fri Oct 05, 2018 4:11 am

drrm123

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Thank you very much Mr Duck It started. Guess i can tell you how dumb i feel. Just needed to pull in the clutch lever. Fired on the first try. Only spent $200 on it so I canít complain. Will take ignition switch back to locksmith tomorrow. And i ordered the correct key blank off ebay.

    

7Back to top Go down    Re: Trying to get bike started? 1985 k100 on Fri Oct 05, 2018 5:01 am

Ron Ashurst

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Congrats on that. It's a great thing to hear that BMW start for the first time. It truly is.


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1988 BMW K100LT ....minus the fairing.
    

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