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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: EdwarddRichtofen on April 28, 2025, 08:42:30 PM
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Hello, I am unable to start my 1991 BMW K 75S. I have replaced the battery, starter relay, and the starter. I am able to bump start it, and ride it around no problem, however, when I press the starter button, I get nothing. No click from the relay, and the headlight does not dim. What could be my issue?
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The starter is interlocked so the transmission has to be in Neutral or the clutch lever pulled in. Sometimes there is a problem in the instrument cluster with the neutral interlock. In that case pulling in the clutch lever will allow the starter to work.
Have you tried starting with the clutch lever pulled in? If that works, there is a problem with the neutral. Is the bike in Neutral? Is the green neutral indicator light on when you try to start?
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It does not work with the clutch lever pulled in… I’ll have to check about the neutral indicator light
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Mine did that when the button switch on the clutch handle went out. But it would start in neutral. Those are the same switches used on the brakes and fail pretty regularly. About $70 at max's btw
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The BLK/YEL wire to the starter relay is what engages the starter relay. It should be 12V when the start button is pressed.
The are two BLK/GRN wires that feed power to the start button. One has 12V from the cluster when the bike is in neutral and the other has 12V when the clutch lever is pulled in.
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Bike is in neutral, no neutral light. Still does not start with clutch, pulled in or a neutral.
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Do you get 12V on the Black/Yellow wire at the connector on the starter relay when you press the start button? From there you would have to back up to the Right hand grip combination switch to check the start button.
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First, I'd remove the starter button panel from the switch block and see if the starter button bridge was contacting the power wire terminals when the button is pressed because it's a one-screw-and-eyeballs procedure.
(https://www.motobrick.com/gallery/4/1601-290425154538.png)
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Greetings, have you upset ANY of the earths beneath your fuel tank....the ones that attach to the main frame spine of your bike? Just asking...
Is your instrument pod plugged in fully and correctly?
Have you attempted to carefully and fully reseat your EFI control module? (the one beneath the seat)