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Ducatti Ignition Coil Needed

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jareds(at)verizon.net
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Posted: Sun Nov 01, 2009 12:44 pm Post subject: Ducatti Ignition Coil Needed

Wierd thing going on.    Both Rear plugs have hot spark but front plugs have weak spark.  Engine seems to try to run on one cylinder when i try to start it.   I know that each cylinders plugs are fired by each coil so does this mean that one top or bottom side of each ignition module is bad?



There is some heat damage to the front ignition.  I can see on the wires where it may have gotten warm enough to melt wiring etc... but the rear one looks fine.



Does someone have one or two ignition modules laying around that are new or used but that are working?



Thanks.

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akflyer

Joined: 07 May 2007
Posts: 574
Location: Soldotna AK

Posted: Mon Nov 02, 2009 7:45 am Post subject: Re: Ducatti Ignition Coil Needed

swap the coils you have, and see if the issue follows the coils.  Hopefully it does and this is the cheap fix!  Just swap the plugs coming out of the engine and it will swap coils.



As the stator is redundant, you should have a hot spark on one front, one rear plug if there is an issue with the stator.  To loose both front plugs, then you would have to loose the same coils on the stator.  Not a very likely event.



Did you try to turn the engine over with the plugs out and not grounded?



Can you get a picture of the melted wires?  I am assuming the heat came from the exhaust and not from electrical heat.  If there was enough resistance in the wires to cause them to overheat and melt, you have bigger issues.

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jareds(at)verizon.net
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Posted: Mon Nov 02, 2009 10:43 am Post subject: Ducatti Ignition Coil Needed

Not muffler heat but more likely resistance.

Plugs were grounded when i tested.

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jareds(at)verizon.net
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Posted: Mon Nov 02, 2009 11:15 am Post subject: Ducatti Ignition Coil Needed

Just to clarify:  Currently BOTH plugs are dull on front cylinder.

If i swap the coils and it follows why do you say it is a cheap fix?

What would be the issue in that case?

So just swap the plastic plugs coming out of engine going to coils and if 

the dull fire is now on both plugs for rear cylinder then we know that it is 

what issue?



---

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akflyer

Joined: 07 May 2007
Posts: 574
Location: Soldotna AK

Posted: Tue Nov 03, 2009 7:39 am Post subject: Re: Ducatti Ignition Coil Needed

I was thinking more about this ( I know it hurt my head and it is scary).  Each coil feeds one front and one rear plug.  If both front plugs are weak, then either the plugs are bad, or the plug wires or caps are bad.  The stator is putting out juice to the coils fine if both rear plugs are firing good.



Is there any black around the tops of the front plugs?  Any chance you could post a pic of the wires and plugs?

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Tue Nov 03, 2009 8:20 am Post subject: Ducatti Ignition Coil Needed

This is just a theory based on some past experience, I want to stress that 

while I know the theory is true, I do not know this to be the source of this 

or in fact any problem, this is standard practice throughout the world, but 

the Ducati ignition is not exactly a powerhouse. The bulk of a spark is DC 

electricity and as such has a much easier time leaving a sparkplug tip to go 

to the block than it has leaving the base electrode to the tip. It may be 

that closing the gap to the minimum specified gap will improve things 

significantly. In practice the easier spark is when the tip is NEG and the 

block is POS, but in our round trip systems this can only be true for one 

set of plugs. I have had motorcycles that would completely fail to run high 

throttle openings with a wide gap.

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jareds(at)verizon.net
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Posted: Tue Nov 03, 2009 9:10 am Post subject: Ducatti Ignition Coil Needed

Actually talked to mechanic at leaf and he said caps on plug wires go all 

the time and gave me an ohm reading to test them.

He also gave me some other testing ohm settings so will have to get back to 

ya'll on what i find.

My head is hurting too.

---

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Tue Nov 03, 2009 12:05 pm Post subject: Ducatti Ignition Coil Needed

One other thing I thought of, it may be wrong to assume that because a spark 

appears weak at cranking speed it will therefore be weak at running speed. 

Remember you are working with an excited system here, meaning the coil packs 

are powered directly by the output of the alternator coils. The power 

available to coil packs will increase to a fair degree as the engine 

increases from cranking speed.



I would vote almost instantly to run at least one of the ignitions from 

battery power if the choice were available. That will likely never happen.

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