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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => Project Custom Motobricks => Topic started by: k75_cafe on May 05, 2015, 07:14:39 AM

Title: My K75 project. My first BMW ever
Post by: k75_cafe on May 05, 2015, 07:14:39 AM
My name is Alex and I bought a K75 1990 last year. It's been sitting for 4 years with the previous owner and i started working on it in march. I/m looking to make it in a cafe racer. I'll put some photos in a few minutes. Today when i put the battery back on it I found that the bike wants to start on it's own without the key even.The electromotor keeps turning but i don't hear the fuel pump working . So although it's wants to start it doesn't. What to look for ? what might be the problem ?
Title: Re: My K75 project. My first BMW ever
Post by: TimTyler on May 05, 2015, 08:50:59 AM
... when i put the battery back on it I found that the bike wants to start on it's own without the key even.The electromotor keeps turning...

Probably a stuck starter relay caused by a weak battery.

Title: Re: My K75 project. My first BMW ever
Post by: k75_cafe on May 05, 2015, 08:54:23 AM
Fully charging the battery will solve the issue ? Or do I need to take further action ? take it down ... clean it ... replace it ... look for new one ?
Title: Re: My K75 project. My first BMW ever
Post by: TimTyler on May 05, 2015, 09:03:03 AM
If it's a stuck starter relay you can try tapping/whacking the relay with a tool and maybe it will un-stick. Once they stick, they are more prone to stick in the future, even with a good battery.

You can replace the relay (they're not cheap) and be careful to use a good battery with good electrical connections.

I have disassembled relays and sanded the previously stuck connections so they'll be less likely to stick. One is in my bike now.
Title: Re: My K75 project. My first BMW ever
Post by: k75_cafe on May 11, 2015, 08:56:56 AM
Sorted out the relay now strugling with the running light staying on during bike being off and turnin off when bike is on.
Also I am lookin for a pair of new radial tyres . Open to sugestions
Title: Re: My K75 project. My first BMW ever
Post by: telecaster-custom on May 21, 2015, 10:18:53 PM
Just starting my own K75 project.  Couple questions, if you don't mind.

What headlight assembly did you use?

What strap-ons/grips?

What plans do you have for instruments/gauges?