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Failing ignition switch #773680
05/14/19 1:03 pm
05/14/19 1:03 pm
Joined: Aug 2001
Posts: 4,599
argyll. scotland, uk
gavin eisler Offline OP
BritBike Forum member
gavin eisler  Offline OP
BritBike Forum member

Joined: Aug 2001
Posts: 4,599
argyll. scotland, uk
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
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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Re: Failing ignition switch [Re: gavin eisler] #773683
05/14/19 1:44 pm
05/14/19 1:44 pm
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Online happy

BritBike Forum member
Allan Gill  Online Happy

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
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
05/14/19 2:28 pm
Joined: Aug 2001
Posts: 4,599
argyll. scotland, uk
gavin eisler Offline OP
BritBike Forum member
gavin eisler  Offline OP
BritBike Forum member

Joined: Aug 2001
Posts: 4,599
argyll. scotland, uk
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
05/15/19 5:26 am
Joined: Oct 2008
Posts: 5,470
Crossville, TN
DavidP Offline

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DavidP  Offline

BritBike Forum member

Joined: Oct 2008
Posts: 5,470
Crossville, TN
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"
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