BMW K bikes (Bricks)


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1Back to top Go down   1987 bmw K75S won’t start Empty 1987 bmw K75S won’t start Fri Apr 14, 2023 3:12 pm

Asher123

Asher123
New member
New member
Hello, I have a 1987 bmw K75S, it was running last week but after coming back from a ride down the road, it wouldn’t start up again, pressing the start button and it won’t make a noise. The battery is charged, kill switch of off, side stand is up, clutch is in, tranny is in neutral, the lights come on when the Ignition switch is on, the blinkers high beam and horn work as well. I tested the starter relay and it works, same with the fuel pump, it works. It doesn’t crank when the start button is pressed, BUT just a few days ago it worked fine.

    

2Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Fri Apr 14, 2023 4:46 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Two Questions:

1.  How many miles?

2.  When was the last time you checked the brushes in the starter motor and cleaned the commutator?

Bonus Questions:

Is the ground wire to the side of the transmission tight? 

Are the connections on the starter motor tight?


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Fri Apr 14, 2023 5:27 pm

Laitch

Laitch
Life time member
Life time member
Asher123 wrote: BUT just a few days ago it worked fine.
A close variation of that theme comes up in hospital ICUs and emergency rooms everywhere and often. Smile 

Your K75S doesn't have a side stand switch so it doesn't matter if your moto's side stand is up or down. I'm interested in how you tested the starter relay and the fuel pump, and but mainly I wonder whether you've checked for power into and out of the starter button.

    

4Back to top Go down   1987 bmw K75S won’t start Empty No go Fri Apr 14, 2023 7:08 pm

daveyson

daveyson
Life time member
Life time member
I guess the starter has good earth through its mounting bolts, but you could check for that.

I guess the starter is getting power. With the start button pressed, you should have 12volts at the starter terminal.

If the starter is getting earth and power, but it's not turning, it's the starter.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

5Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Tue Apr 18, 2023 11:41 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Asher123 wrote:Hello, I have a 1987 bmw K75S, it was running last week but after coming back from a ride down the road, it wouldn’t start up again, pressing the start button and it won’t make a noise. The battery is charged, kill switch of off, side stand is up, clutch is in, tranny is in neutral, the lights come on when the Ignition switch is on, the blinkers high beam and horn work as well. I tested the starter relay and it works, same with the fuel pump, it works. It doesn’t crank when the start button is pressed, BUT just a few days ago it worked fine.
Please read the forum rules before posting a question. This is the Member's Intro section. This thread should be in Troubleshooting.


__________________________________________________
History is a vast early warning system ~Norman Cousins - Political Journo, Editor, Author & World Peace Advocate, 1915 - 1990 - Wikipedia
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

6Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Sun Apr 23, 2023 9:23 am

Bernie_K100

Bernie_K100
Platinum member
Platinum member
Hi,

1987 bmw K75S won’t start 177912 to this forum!


Bernie

    

7Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Sat Apr 29, 2023 8:10 pm

Paddy1

Paddy1
Silver member
Silver member
Welcome… first try simple push to start button and be sure on/off kill switch is in the correct position. I know sounds… but


__________________________________________________
Riding Beemers since 1988
1986 K100RT, 1985 K100RS, 
2001 K1200LT, 2004 R1100S, 
2004 R1150, 1980 R65, 
2014 Zero FX, 2021 Zero SR/F
    

8Back to top Go down   1987 bmw K75S won’t start Empty Re: 1987 bmw K75S won’t start Sun Apr 30, 2023 5:20 pm

Paddy1

Paddy1
Silver member
Silver member
Oops! I’m bad, just re read original post.1987 bmw K75S won’t start 652573


__________________________________________________
Riding Beemers since 1988
1986 K100RT, 1985 K100RS, 
2001 K1200LT, 2004 R1100S, 
2004 R1150, 1980 R65, 
2014 Zero FX, 2021 Zero SR/F
    

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