BMW K bikes (Bricks)


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1Back to top Go down    Starter button source? on Tue Jun 28, 2016 7:08 pm

Bikesmith

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Does anyone know where I can find a replacement starter button/kill switch for a 1985 K100RS? The top of my button is broken off. I just have the shaft through the middle of the kill switch. It works, but it doesn't look great and I'm a little concerned about accidentally activating the starter since I don't have a spring to retract the button.

I've found plenty of sources for a full replacement switchgear, but I can't find just the starter button/kill switch anywhere.

Any ideas?


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Jon
Mechanically competent, electrically idiotic
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1985 BMW K100rs
1940 Royal Enfield WD/CO
1968 Honda CL125
    

2Back to top Go down    Re: Starter button source? on Tue Jun 28, 2016 8:43 pm

RicK G

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They are difficult to find and usually you need to buy the whole switch block. Don't be too concerned about touching the button when the bike is running because the starter relay cant operate if the engine revs are over 711rpm (inbuilt safety don't ya just love BMWs).
Sidecar Paul made a button from aluminium if you do a search or look at his recent posts you will find it.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: Starter button source? on Wed Jun 29, 2016 5:56 pm

sidecar paul

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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
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4Back to top Go down    Re: Starter button source? on Wed Jun 29, 2016 6:45 pm

robmack

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I learnt from an email sent to me that Itead Studio has a new 3D printing service. They have a 72 hour turn-around time and printing starts at US$1.90. I'm not sure what that gets you. However, if you can get the 3D model of the button, you should be able to get one printed in high-strength white resin at 100 micron accuracy.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
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5Back to top Go down    Quick fix using 10ml syringe on Thu Jun 30, 2016 3:23 am

Sunnyk75

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I followed a thread a while back posted by fellow member, Hollister. He used the black rubber plunger off a 10 ml syringe. It fits perfectly over the red kill switch ring. I tried it on my broken starter button and it's been great for nearly a year now. Search "syringe" and "starter button" on the forum for a picture. My sister in law works in a medical lab so she brought me a handful so I have spares. I did one more mod and that was to cut a small hole that the stub of the green starter button sits in. There is a slight conical shape to the plunger that pulls the stub up in rest position

Good luck.

Sunny

    

6Back to top Go down    Starter Plunger - Beware on Tue Sep 20, 2016 6:31 pm

buddymack

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While the starter won't engage with the engine at or above 711 rpm, I believe depressing that button (or having gravity depress the button) can activate the Shed Relay which will create all sorts of other intermittent problems.

    

7Back to top Go down    Re: Starter button source? on Tue Sep 20, 2016 7:23 pm

kioolt

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The load shed relay will only de-activate if the starter gets 12 volts from the starter relay. Since the starter relay will not activate above 711 rpm that's not a concern. A concern that I can think of is that when the starter button is pushed you enrich the air/flue mixture if I am correct.


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2004 R1150RT 183,000 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total418,600 BMW miles

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