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 Post subject: Hi all 900ss with 750 paso ignition help
PostPosted: Thu Jun 18, 2015 5:24 pm 
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Joined: Wed Jun 17, 2015 5:55 am
Posts: 6
Location: UK
model: 900 SS
year: 1990
Right hoping for some confirmation on a digiplex 2 ignition fault, my 1990 bike has stopped sparking on the rear cylinder at 3700 rpm rev it up and rear cylinder cuts out, remove plug cap ground a new plug confirm s spark literally stops!, changed coils wiring from front to back and surprisingly it still stops sparking on the rear cylinder which indicates to me pickup or digiplex, pick up either works or not as far as I know and front is fineso assuming a new digitplex is required, front cylinder is fine on either coil and everything else passes as ok any thing I have missed? And I also assume a Paso 750 digiplex would work ok, air tube is also ok as is the digiplex earth HELP :-)


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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Thu Jun 18, 2015 6:50 pm 
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Joined: Sun Jan 16, 2005 12:00 am
Posts: 257
Location: The Netherlands
model: 750 Paso
year: 1989
Hi, did you changed the coils also from vertical to horizontal..? Suppose you allready tried other spark plug cables etc to be sure..?

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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Thu Jun 18, 2015 8:02 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3159
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
check the ignition switch

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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Fri Jun 19, 2015 9:26 am 
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Joined: Tue Jun 16, 2015 9:31 am
Posts: 5
Location: Germany
model: 750 Paso
year: 1988
Has the pickup-line the greatest possible distance to the ignition cables?


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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Fri Jun 19, 2015 12:15 pm 
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Joined: Wed Jun 17, 2015 5:55 am
Posts: 6
Location: UK
model: 900 SS
year: 1990
Yes 're coils, rewired them both, same fault, the pickup is working fine to the horizontal cylinder and both cylinders are fine to3700 rpm when the rear stops sparking, ignition switch must be ok because it's starting fine


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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Sat Jun 20, 2015 9:31 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 542
Location: Scotland
model: 907 I.E.
year: 1994
But the ignition switch is well known weak point and can develop resistance across the contacts dropping the volts on load. If the volts are down that could be a reason for the sparks stopping on the rear cylinder. The rear may be more sensitive to a reduced voltage. The cure for the ignition switch is to fit a relay to do the switching, triggered by the ignition switch.

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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Sat Jun 20, 2015 12:14 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3159
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Quote:
ignition switch must be ok because it's starting fine


maybe yes maybe no

The purpose of the relay mod is to eliminate the ignition switch as a well known trouble spot and to lower the electrical stress on the switch to prolong its life. Moving the headlight load away from the switch also helps with ignition issues as well as the life of the switch

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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: Hi all 900ss with 750 paso ignition help
PostPosted: Wed Jun 24, 2015 8:06 pm 
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Joined: Wed Jun 17, 2015 5:55 am
Posts: 6
Location: UK
model: 900 SS
year: 1990
Paso ecu fitted and now perfect :-)


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 Post subject: Re: Hi all 900ss with 750 paso ignition help
PostPosted: Wed Jun 24, 2015 9:31 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3159
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
just got lucky, was a wiring issue most likely

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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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