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Re: Diagnosis please [Re: Uncle D] #746040
08/19/18 12:24 pm
08/19/18 12:24 pm
Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
The original symptoms suggest a disconnection in the power supply to the EI unit, I have had exactly the same when the ignition supply fuse ( non stock wiring) blade connector rattled loose, easy fix in my case.

For your fault I would try a hot wire , by pass the ignition switch and see if this improves things, if so the ignition switch contacts are the source of your problem, if you have a meter set to low ohms you can check the switch function by metering across the terminals and operating the switch, it should break to infinity and close to almost zero ohms, any fluctuation or non repeatability of the closed switch readings means a fail.

Edit, its a new switch, still worth checking though.

Last edited by gavin eisler; 08/20/18 9:13 pm.

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: Diagnosis please [Re: Uncle D] #746092
08/19/18 10:18 pm
08/19/18 10:18 pm
Joined: Jan 2014
Posts: 3,993
Aus
N
NickL Online content
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NickL  Online Content
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N
Joined: Jan 2014
Posts: 3,993
Aus
You've tried a substitute Boyer box on it? Should be ok with the sparx plate, both use around 120 ohms on the stator.

Only other thing i can think is AC is getting through from the alternator (dud rectifier) but that would stuff your battery very quickly.
Gavin's suggestion is a good one, just use the battery wired direct to the coil and ignition. No alternator/rectifier or any other connections.


Lamas are bigger than frogs.
No room for sanity here.
Re: Diagnosis please [Re: Uncle D] #746124
08/20/18 4:25 am
08/20/18 4:25 am
Joined: Aug 2001
Posts: 133
Anchorage Alaska USA
M
Mitch Offline
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Mitch  Offline
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M
Joined: Aug 2001
Posts: 133
Anchorage Alaska USA
double check the ignition timing... like the whole procedure for the setup.

Re: Diagnosis please [Re: Uncle D] #746199
08/20/18 8:27 pm
08/20/18 8:27 pm
Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
Just to add a bit more sauce to the pot, Before my Boyer shed its power supply , it had been dangling by its leads, for how many miles dunno? loads probably, the velcro had let go, bouncing around behind the side panel. Once the connection was sorted , back to normal, Boyers are pretty tough. My 18 year old Boyer is still happily firing NGK plugs ( all be it through new 6 volt coils) which were rescued from the bin in the bike shop 8,000 miles ago, discarded as diesel fouled . The Boyer I have is a red one Mk IV maybe.
I am on my 3rd ignition switch since new ( presuming it had its original when I first got it)


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Diagnosis please [Re: gavin eisler] #746499
08/23/18 8:59 am
08/23/18 8:59 am
Joined: Jun 2002
Posts: 10,178
Scotland
S
Stuart Offline
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Stuart  Offline
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S
Joined: Jun 2002
Posts: 10,178
Scotland
Hi,

Originally Posted by Uncle D
I have read that it is recommended to earth the engine to the battery?

If spark plugs are being fired by single-ended (one HT lead) coils, that circuit relies on good connections between the plugs ('earthed' through their connection to the engine) and the other end of the coils' HT windings. If an engine uses points, the ignition LT circuit also relies on a good electrical return path to battery +ve. If the engine has an oil pressure switch, that 'earths' through its mounting on the engine. Imho, it's good to have an obvious connection between engine and battery, rather than relying on connections between other components in between.

Originally Posted by gavin eisler
The boyer I have is a red one

MicroDigital. Mk.4 is still analogue so still Black box.

Hth.

Regards,

Re: Diagnosis please [Re: Uncle D] #746666
08/25/18 2:06 am
08/25/18 2:06 am
Joined: Jan 2014
Posts: 3,993
Aus
N
NickL Online content
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NickL  Online Content
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Joined: Jan 2014
Posts: 3,993
Aus
I think the MicroDigital is the first of the u-processor based units Boyer made. Red box.
It had the idle stabilisation etc so i think it must be using a look up table, indicating it's a micro based system.


The Micro Digital ignition provides almost total control over ignition functions. In common with the MKIII, it offers electronic control of advance and retard functions. However, because the Micro Digital features a built in computer, the size of a postage stamp, it can make more than a million ignition decisions per second, to constantly monitor engine speed and time the spark precisely to suit. The programming of this micro processor also gives control over ignition coil energy, starting speed, tickover stabilisation and rev limits!

Last edited by NickL; 08/25/18 2:09 am.

Lamas are bigger than frogs.
No room for sanity here.
Re: Diagnosis please [Re: Uncle D] #748475
09/09/18 11:01 am
09/09/18 11:01 am
Joined: May 2013
Posts: 12
Northern Territory, Australia
U
Uncle D Offline OP
BritBike Forum member
Uncle D  Offline OP
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U
Joined: May 2013
Posts: 12
Northern Territory, Australia
So after replacing just about everything with no improvement I shelled out for a new Pazon.

As I was removing the old Sparx pick up plate, I noticed a small shard of magnet from the rotor had attached itself across the solder points on the underside of the plate, creating a short.

Bike is running beautifully on the Pazon and I have a new Sparx rotor on the way (£10) and will probably fit this EI to the A10 some time down the track.

You live and learn.


My Giddy Aunt!
Re: Diagnosis please [Re: Uncle D] #748483
09/09/18 12:10 pm
09/09/18 12:10 pm
Joined: May 2013
Posts: 4,952
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member
Joined: May 2013
Posts: 4,952
Rotherham - S. Yorkshire
I think you made the best choice, mine always seemed happiest with the bog standard pazon, even over its Altair bigger brother.


beerchug
Re: Diagnosis please [Re: Uncle D] #748502
09/09/18 3:26 pm
09/09/18 3:26 pm
Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
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Joined: Aug 2001
Posts: 4,075
argyll. scotland, uk
Interesting fault, you got there in the end, well done. One to remember.


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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