Running on one cyclender

discussions specific to the 750 Paso

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viper1
Posts: 68
Joined: Tue Dec 03, 2013 12:12 am
model: 750 Paso
year: 1988
Location: DePere, WI USA

Running on one cyclender

Post by viper1 »

It's backfired a few times but now is running on one cyclender (the fornt one actually) it has spark, I took the tank off and cleaned the main jet (the one you see on the top) Blew it out a few times put it back in and still the same thing.....Any idea's? Running the stock webers.
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higgy
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Re: Running on one cyclender

Post by higgy »

You can find G's excellent chart in the documents section

http://ducatipaso.org/docs/general/
Checklist - engine wont start v2.0.zip
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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paso750
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year: 1987
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Re: Running on one cyclender

Post by paso750 »

check p.3 of the FAQs.
viper1
Posts: 68
Joined: Tue Dec 03, 2013 12:12 am
model: 750 Paso
year: 1988
Location: DePere, WI USA

Re: Running on one cyclender

Post by viper1 »

paso750 wrote:check p.3 of the FAQs.

huh?
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paso750
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Re: Running on one cyclender

Post by paso750 »

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higgy
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Re: Running on one cyclender

Post by higgy »

P750 engine running on one cylinder (occasionally)

The problem could be everything from
pick-ups (quite rare)
incorrect pick-up clearance to flywheel (air gap)
pick up wiring (can break where it enters the engine cover. The pick-ups will measure the correct resistance if a wire isn`t completely broken which makes it tricky)
ground connection to CDI units
CDI units (quite rare)
wiring to the coils (kill switch, ignition switch)
coils
spark plug (HT) wires
spark plugs, incorrect electrode gap
carb synchronization

HT wires can age and if a coil has cracks in the housing it can be affected by temperature or humidity.
The most common problem though is the wiring with bad connections and old wires with copper rust.
Measure the voltage at the coils and CDI units (orange wire) and if it isn`t nearly the same as the battery voltage clean the kill switch and all electrical connections (specially the main ground connections) then do the wiring mod.
https://app.box.com/s/waxvk1l9g47phfybd6n9
One indicator of low voltage at the coils is if the dropped out cylinders kicks in when rpms are increased.
Electrical resistance of bad connections does increase with heat btw.

To rule out parts like CDI units or coils swap them from one cylinder to the other (one part at a time) then see if the problem shifts to the other cylinder. If the problem remains the same the parts swapped are ok and the problem is somewhere else.

If the issue remains check compression and valve clearances.
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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paso750
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Posts: 5558
Joined: Sun Jul 18, 2004 12:00 am
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year: 1987
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Re: Running on one cyclender

Post by paso750 »

you`re so kind hearted these days higgy :) :thumbup:
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higgy
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Joined: Tue Jul 29, 2008 9:50 pm
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Re: Running on one cyclender

Post by higgy »

you`re so kind hearted these days higgy :) :thumbup:
No, not really, just try to only pic fights with those that are armed to the teeth and ready to rumble :beer:


or fools and their Idiocrity :banghead:

Oh, maybe you're correct.He did spell Cylinder incorrectly, guess I need new glasses :drunk:
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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