no spark mystery

poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

ok, so im at a real loss over what happening with my bike (98 honda hornet 600), and even the mechanic is stumped. i was riding the bike down the bypass on thursday when it started to judder and then lost power completely. pulled over and tried to restart, however it was turning over, but not sparking. AA came out and couldn't find any faults, so off to the garage i go.

they have quite literally checked everything and can't find the issue, as far as they can see everything is working as it should be.

they have checked the coils, pulse generator, HD leads, both diodes, all switches, voltage in all wiring, plugs, fuses, (basically the entire wiring loom) and still nothing. as the mechaninc has checked everything was fine up to the CDI, we thought that the CDI may be at fault, however after buying another one today, i am still having the same issue.

either i've bought another broken CDI, or there is another fault somewhere that we can't find Sad

any help or advise is much appreciated.

cheers,
rick

MattEMulsion · World Chat Champion Joined: 29 Aug 2004 Karma :

I assume that there is no spark from either coil?
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poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

yeah neither coil is sparking

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

The signal is caused by a magnet attached to the crank/ flywheel.

If this becomes detatched, this would result in no sparks. Never heard of it actually happening though.
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poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

yen_powell · World Chat Champion Joined: 22 Jun 2008 Karma :

prawny1 · World Chat Champion Joined: 28 Jun 2005 Karma :

If it is the integrated immobiliser model the transponder sensor around the barrel can suffer a bad connection.

I've seen it a few times on newer Honda's, try wriggling the wiring around the sensor (pushing up towards the key from below).

They are not coded so a second hand one will work so long as it is the same type.
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jjdugen · World Chat Champion Joined: 03 Jun 2011 Karma :

Nastyyyy.......
I have had a pickup coil become dislodged and wear itself against the rotor, that is obvious and self evident. But the juddering and then failure does suggest something physically breaking or breaking down (electrically I mean, I know you have broken down).
Generally, you can see physical evidence of the ecu ' ignitor unit failing, there is usually a burnt or bubbled area on the casing.
I take it that the fault finding did include checking the reg/rec for failure. If this has really cooked, then it will have toasted the ecu.
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poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

the 98 reg is prior to the immobliser being fitted so that shouldnt be effecting it. ive got a freind nearby who is going to let me use his bike to test the CDI's on, atleast that way i can make sure the CDI's are definately not faulty!

katana · Trackday Trickster Joined: 04 Jul 2004 Karma :

Check the resistance of the pick up coil.

poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

katana · Trackday Trickster Joined: 04 Jul 2004 Karma :

Im-a-Ridah · World Chat Champion Joined: 20 Oct 2006 Karma :

You are totally totally sure it's not the kill switch or a short related to it? And all wires are properly connect and have been given a bit of WD40 treatment if dirty? All earths are connected and clean?

orac · World Chat Champion Joined: 25 Sep 2011 Karma :

this sounds alot like something that happened to my bike, turned out to be a wire for the ignitor relay had internaly broken (ir it looked ok from the outside), and even tested ok in some positions.

it maybe worth checking your black box is getting the power it needs.
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poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

we double checked the kill switch and connections and everything was fine. im taking the black box over to a mates today to test on his bike so if the bx is fine, atleaset that shows it could be a wiring problem like orac suggested?!

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Have you changed the pick up coil?

My cb1 turned out to be the pick up coil after 2 faulty ones read fine on the multimeter. You need an oscilloscope to check these things properly.
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poole122 · Renault 5 Driver Joined: 22 Feb 2011 Karma :

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

My bet it is still the pick up coil, the rotor is just a rotor with no magnets (bet the whole rotor is just magnetised) will be at fault. If you can, get someone with an oscilloscope reader and book it up.

This part is crucial, and if it doesn't work, nothing else will work.

What about swapping your mates pick up case (with coil attached) to yours?
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