BMW K bikes (Bricks)

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1Back to top Go down    RT wont start on Thu Mar 09, 2017 5:17 am

AL-58

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Ill be looking at this on this Saturday coming.

Just looking for any specifics I should check.

Its electrical, the battery is fully charged but there is nothing when I turn the key on. Its not the ignition switch as there is no power at the ignition switch. All the fuses appear fine.

What is in the circuit that I should check?

Al


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

2Back to top Go down    Re: RT wont start on Thu Mar 09, 2017 5:40 am

Chocolate

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Hey!

Make sure the Battery is realy good, if she shows 12-13 V it doesn't mean she is OK, a cell could still be dead!

The cigarette plug should have power measure that!

I would replace some fuses, could be bad and you don't see it, or measure the fuses with a multimeter.

Have you cleaned the earth contact at the gearbox?

Cheers


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
Pictures:Me my bike and I
    

3Back to top Go down    Re: RT wont start on Thu Mar 09, 2017 5:51 am

Holister

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Power to the ignition switch comes directly from the battery B+. The power does not pass thru any fuse or relay BUT it does loop off the starter relay. Pull the relay out and you'd still have power to the ignition. I think there's a connector in there somewhere but I can't remember where. Could be corroded/disconnected??
What's telling you that you have no power at the ignition switch?


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

4Back to top Go down    Re: RT wont start on Fri Mar 10, 2017 10:17 pm

AL-58

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Probably the 0.0V reading on the voltmeter measured at the back of the ignition switch when the battery reads 12.7V

Probably a pretty fair indicator.


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

5Back to top Go down    Re: RT wont start on Fri Mar 10, 2017 10:22 pm

AL-58

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Running again, it was simply the connector plugging the ignition switch to the loom.

I couldn't explore it during the week as I couldn't pull the tank back due to short fuel hoses. The lower left fairing needed to be removed to sort the hoses, no time during the week.

Connector sorted, hoses replaced and finally changed the alternator for one that charges properly.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

6Back to top Go down    Re: RT wont start on Sat Mar 11, 2017 12:44 am

charlie99

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good find al

ill be investigating installing a relay to take the high load currents away from the ignition switch and cabling - connectors
no big change to the system but bypassing the now ageing ignition switch ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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