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Old 10-11-2012, 09:28 PM   #1
KungPaoDog OP
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Joined: Apr 2010
Location: Colorado
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94 Ducati 750 SS Won't Spark

From what I can tell this is bike is almost the same as a 900ss from the same era with a different engine, same electronics.

The bike sat for a year outside, so my first thought was corrosion. The ground was nice and rust plated, and now I have zero resistance on the ground from the battery.

The only way I can get a spark is if I turn the bike on and off with the key. To me this indicates that the coils are getting charged, but no signal to discharge from the CDI boxes, or igniters.

I've checked the pickups inside the left case. They have good continuity and resistance, and they react to a magnet. I know this isn't a very scientific test, but they aren't very likely to fail at the same time. Cleaned many wire connections and ground points. Checked fuses. One new spark plug cap. Coils seem to check out fine. Battery is brand new. I have 12 volts to the coils.

The CDI boxes do not have the same resistance at the same pins, so I suspect that one may be bad, but then I should still get spark at one cylinder, so I'm not ready to put at least $150 into a new CDI box until I can verify good/bad.

Anyone know the correct ohms for the pins on a CDI box?

Any other ideas why this Duc won't spark?
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KungPaoDog screwed with this post 10-11-2012 at 09:44 PM
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Old 10-12-2012, 01:55 PM   #2
noman
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here?

i'd try posting over at ducati.ms, might have better luck.
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Old 10-12-2012, 10:47 PM   #3
squish
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Quote:
Originally Posted by KungPaoDog View Post
Any other ideas why this Duc won't spark?
Before spending the cash on the new box try a few things first
Rule out the easy simple and cheap fixes first.
Good Battery?
Good Plugs?
Good grounds and connections?
Good Plug wires?
Good Coils?

Clean all the electrical contacts involved in the starting and ignition circuts
Up to and including the handlebar switches and any safety interlock devices like clutch and side stand switches (of just jump those for testing)

Also try starting the bike with the sidestand up and the clutch pulled in.

Once you've gone through all of the easy stuff then start looking at the hard to deal with or expensive stuff.

If the bike sat out, and it was as corroded as you say I'm guessing it's not only the battery ground that's bad.
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Old 10-13-2012, 11:39 AM   #4
KungPaoDog OP
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Thanks, Squish. I've done a lot of that but the most recent thought I had was that if the sidestand switch (one wire) completes the circuit for ignition then it may be corroded and not letting enough juice through to trigger spark. Same for the ground path through the kill switch (cleaned but not jumpered around).

Batt is brand new. Plugs good. Coils good. Plug wires/caps good. Lots of wiring contacts cleaned and ohm'ed.

Anyone have a wiring diagram for this bike?
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