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 Post subject: Ignition hiccup
PostPosted: Fri Oct 14, 2011 3:02 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1319
Location: SF Bay Area
model: 750 Sport
year: 1990
The Sport is running better than ever. I got new o-rings on the intake manifolds and balanced the carbs (36 Dells) I got up to 120mph last weekend, and just generally had a great time.

But the bike has developed an odd new malady. It hiccups about every 4-6 minutes. At constant throttle, or even accelerating, the bike just misses a few strokes, then picks right back up. Its like the ignition just shuts off for a few revolutions. Haven't noticed it before, but now its rather constant. Like some playing with a light switch.

I plan on taking out the ignition pickup (only one on the Magnet Marelli 2S system) and cleaning it up just to make sure its working. I've heard that cleaning off those shim washers on a regular basis is a good idea also, as they set the distance of the pickup.

Any other ideas of what I should go look at while I'm staring at it?

Thanks in advance.

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Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: Ignition hiccup
PostPosted: Fri Oct 14, 2011 5:41 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3177
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Had a similar problem on the 906. Turned out to be a combination of the ignition switch and the wiring to the module. In the end I replaced all the terminals at the module and the switch. Hasn't missed a beat since :beer: :beer:

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Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: Ignition hiccup
PostPosted: Mon Oct 17, 2011 7:06 pm 
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Joined: Sun Jul 26, 2009 7:35 pm
Posts: 104
Location: Haarlem, The Netherlands
model: 750 Sport
year: 1989
Hi,

Too bad... Is it on both cilinders? Did you by accident disturb some other system (electrics) with the last repairs?

Hope you will find it soon...

Regards Joep


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 Post subject: Re: Ignition hiccup
PostPosted: Thu Oct 20, 2011 3:46 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1319
Location: SF Bay Area
model: 750 Sport
year: 1990
Yeah, its both cylinders.
And yes, I was fiddling with the connectors by the ECU.
I was putting in a breather box, and pushed the wires around alot. I guess I'll go back and check the connectors. Seems likely.
Thanks,

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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