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Failing ignition switch #773680 05/14/19 1:03 pm
Joined: Aug 2001
Posts: 4,565
gavin eisler Offline OP
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I know Brit ignition switches are sometimes dodgy.
My latest experience is worth a mention.
I recently fitted a Smiths electronic tach, this has an interesting characteristic, if the power is interrrupted when in service it resets to zero and remains there.
A couple of months ago it did this and the motor showed classic interrupted supply, running missing , backfires etc.
I checked the switch at the time , found a bad contact when testing on closed position , got fluctuating ohms. Blessed it with WD 40 , retested OK.
Fast forward to last night, tach died twice, no obvious miss fires.
Checked the switch again and found one of the terminals was loose where the contact was supposed to be rivetted to the blades terminal. Cleaned it up and soldered the blade to the contact. Tested OK.
I would never have noticed this if the tach was the normal mech type.
New switch on order.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
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Re: Failing ignition switch [Re: gavin eisler] #773683 05/14/19 1:44 pm
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Allan Gill Offline
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Didn’t you change the switch not too long ago Gavin?


beerchug
Re: Failing ignition switch [Re: gavin eisler] #773691 05/14/19 2:28 pm
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gavin eisler Offline OP
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naw , i was going to get around to it, then forgot, now its getting the gumach.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Failing ignition switch [Re: gavin eisler] #773763 05/15/19 5:26 am
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DavidP Offline
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I had a similar experience with my electronic tach recently, but it would go to 8 and stay there, then work for a while, then go to zero. Turned out to be a loose connection but not the main switch.
I used to carry a jumper with three male spades wired together to use in case of switch failure or if I lost the key.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
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72 T150V "Wotan"
Re: Failing ignition switch [Re: gavin eisler] #774762 05/26/19 1:47 pm
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Stein Roger Offline
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Some 4 pos switches will start to fail very quickly, the new one on the Trident lasted all of two seasons or only around 5000 km... (I have other bikes)
Thankfully I was prepared as I've done this a few times: http://www.nocnsw.org.au/technical/rebuild-lucas-ignition-switchtobetterthannew

Easy to do, and it really does become better than new.

Re: Failing ignition switch [Re: gavin eisler] #774788 05/26/19 7:13 pm
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gavin eisler Offline OP
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Thanks for the link.
I use the two position switch , its even more chintzy.

Last edited by gavin eisler; 05/27/19 9:49 am. Reason: See TT below

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Failing ignition switch [Re: gavin eisler] #774791 05/26/19 7:56 pm
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triton thrasher Online Content
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Originally Posted by gavin eisler
naw , i was going to get around to it, then forgot, now its getting the gumach.



Yeah Worzel and Aunt Sally will sort it out.


Amateur Loctite enthusiast.
Re: Failing ignition switch [Re: gavin eisler] #774792 05/26/19 8:00 pm
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triton thrasher Online Content
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Originally Posted by gavin eisler
Thanks for the link.
I use the two position switch , its even more chintsy.


I think spelling matters. You don’t have to agree.

https://en.m.wikipedia.org/wiki/Chintz


Amateur Loctite enthusiast.
Re: Failing ignition switch [Re: gavin eisler] #774797 05/26/19 10:07 pm
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NickL Offline
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These are suitable for tractors, so must be ok.

https://www.eBay.com.au/itm/Universal-Car-12V-Forklift-Tractor-Ignition-2Key-Switch-Lock-4-Position-unique/312025790007?hash=item48a62fb637:g:CQIAAOSwYxBaMhB5

Re: Failing ignition switch [Re: gavin eisler] #774838 05/27/19 9:57 am
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gavin eisler Offline OP
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thats a good looking switch, thanks Nick. might be a bit on the long side.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod

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