Paso 750 missing
Paso 750 missing
After driving the paso for about 30 km it starts backfiring and cutting out.
Shoulkd I start with electrics (coils breaking down?) or fuel (vapourisation, pump failure, dirt in carb)?
Anyone experience similar previously?
Shoulkd I start with electrics (coils breaking down?) or fuel (vapourisation, pump failure, dirt in carb)?
Anyone experience similar previously?
907IE
Paso 750
CB 900FD
KX 500
KTM 500 with Zabel 700 Engine
zx10
Mobylette Cady
Paso 750
CB 900FD
KX 500
KTM 500 with Zabel 700 Engine
zx10
Mobylette Cady
- higgy
- paso grand pooh-bah
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- model: 907 I.E.
- year: 1992
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Re: Paso 750 missing
Start with fuel, then check electrics. Electrically start at the battery
G has a chart in the documents section
G has a chart in the documents section
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
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
-
- paso grand pooh-bah
- Posts: 574
- Joined: Thu Oct 27, 2011 7:47 am
- model: 750 Sport
- year: 1988
- Location: Wollongong,Australia
Re: Paso 750 missing
As Higgy said start with your fuel.Possibly clogged fuel filter,dirt or water in your tank.Back firing usually means lean especially on the over run so it sounds like it is starving for fuel.If you let it sit for a few minutes then ride it does it again run for a while before the same problem arises?.If so then fuel sounds like your problem.
Cheers
Andrew
P.S. also check your breather tube as that can become blocked causing a vacuum in your tank.
Cheers
Andrew
P.S. also check your breather tube as that can become blocked causing a vacuum in your tank.
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- Posts: 192
- Joined: Sun Jul 24, 2011 1:57 pm
- model: 750 Paso
- year: 1988
- Location: delta b.c. canada
Re: Paso 750 missing
what igntion system does your bike have digiplex or keyosan.
does it seem that it only happens when the bike get warm (after 30 km)
and after the bike sits for 5-10 mins does it start right away but will not rev above 3-4000
without backfireing
does it seem that it only happens when the bike get warm (after 30 km)
and after the bike sits for 5-10 mins does it start right away but will not rev above 3-4000
without backfireing
- fredskidoo
- Posts: 240
- Joined: Sat Nov 29, 2008 6:30 pm
- model: 750 Paso
- year: 1987
- Location: Hwy 1 - Tomales, CA - 94971
- Contact:
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- paso grand pooh-bah
- Posts: 1879
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- model: 906 Paso
- year: 1990
- Location: New Zealand
Re: Paso 750 missing
yeah ! me tofredskidoo wrote:Jeez - you had me thinkin' someone stole you ride! Whew!
I wish I was young again............Id be heaps smarter than last time
- fredskidoo
- Posts: 240
- Joined: Sat Nov 29, 2008 6:30 pm
- model: 750 Paso
- year: 1987
- Location: Hwy 1 - Tomales, CA - 94971
- Contact:
Re: Paso 750 missing
I had a similar problem . . . I had an Earwig stuck in my fuel line!!! Go figure
'87 750 Paso 751412
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- paso grand pooh-bah
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Re: Paso 750 missing
I read and re-read the posts and could'nt figure out what you meant.Then I noticed the thread titlefredskidoo wrote:Jeez - you had me thinkin' someone stole you ride! Whew!
Cheers
Andrew
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- paso grand pooh-bah
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- model: 906 Paso
- year: 1990
- Location: New Zealand
Re: Paso 750 missing
aussieAndrew2 wrote:I read and re-read the posts and could'nt figure out what you meant.Then I noticed the thread titlefredskidoo wrote:Jeez - you had me thinkin' someone stole you ride! Whew!
Cheers
Andrew
I wish I was young again............Id be heaps smarter than last time
- randtcastell
- Posts: 359
- Joined: Fri Nov 13, 2009 4:33 pm
- model: 750 Paso
- year: 1987
- Location: San Francisco Bay, California USA
- Contact:
Re: Paso 750 missing
I had a somewhat similar problem just recently: I would start the '87 750 Paso up no problem and it would idle fine and I'd ride off and it would then die. I'd pull over and it would not easily restart until maybe five minutes passed. Then I'd ride for 30 miles or so and the vertical cylinder would drop out. I'd pull over and another SF Bay Area Pasoista (Gunther) and I would fiddle with the electrics— checking connections, checking for spark, switching plugs etc. Ten minutes would pass and it would start up again fine and both cylinders would be firing. We'd ride off but after a few miles the vertical cylinder would drop out again. This happened several times over until we abandoned the idea of a long ride. As I tried to get home on the interstate highway, both cylinders died. By then, it was time to call the wife and get the truck and trailer out for a rescue. After a lengthy diagnosis (we all thought the problem was an ignition coil, bad wiring or a pick-up coil), the problem turned out to be the new fuel filter I had just installed when I replaced all the fuel lines and had the tank leak welded up and the tank cleansed of the loose rust within. I had plumbed the new fuel filter upstream from the fuel pump (as the old one was) but it seems the fuel pump just couldn't cope with the added strain of sucking the fuel through the new filter (even though I had installed it with the flow arrow pointing in the correct direction), hence starving the vertical cylinder first, then both cylinders of fuel. After removing the filter, it was apparent that there was a bit of staining from some minute rust particulate that passed through the filter in the tank at the petcock, but we could still easily blow our breath through the new inline filter. I guess the fuel pump is a sensitive old pump even though it is a very low pressure pump. Upon removal of the new fuel filter, the Paso has run perfectly under all conditions for 200+ miles. From now on, I'll just rely on the petcock filter and the filters at the fuel line banjos at each of the Dellorto PHM40's. Strange but true...
1987 Ducati P750
1973 Honda CB450
2022 KTM RC390
1973 Honda CB450
2022 KTM RC390
- ducinthebay
- paso grand pooh-bah
- Posts: 1323
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- model: 750 Sport
- year: 1990
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Re: Paso 750 missing
Randtcassel,
sounds as though your old fuel pump just that. Old. I think you found the limit of what it can do at this point. While I haven't taken a fuel pump apart, it does have moving parts, and they do wear out over time. I suppose the correct thing to do is to check to see what pressure it is putting out. Easy way is to just disconnect the fuel line from the bottom of the tank and direct it into a bucket and turn on the key and see what output looks like.
Do you still have the restricting jet in the fuel line? Maybe time to yank it out.
Cheers,
Phil
sounds as though your old fuel pump just that. Old. I think you found the limit of what it can do at this point. While I haven't taken a fuel pump apart, it does have moving parts, and they do wear out over time. I suppose the correct thing to do is to check to see what pressure it is putting out. Easy way is to just disconnect the fuel line from the bottom of the tank and direct it into a bucket and turn on the key and see what output looks like.
Do you still have the restricting jet in the fuel line? Maybe time to yank it out.
Cheers,
Phil
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.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
- randtcastell
- Posts: 359
- Joined: Fri Nov 13, 2009 4:33 pm
- model: 750 Paso
- year: 1987
- Location: San Francisco Bay, California USA
- Contact:
Re: Paso 750 missing
Hey Phil:
Thanks for your response and knowledgeable opinion. I have previously remove the restricting jet in the fuel line. I wish there was either a viable replacement for the fuel pump that was a plug and play solution or a way to eliminate the item from the circuit. But for now, I'll just ride 'till it fails. I had a great 220 mile ride yesterday mostly through the Santa Cruz Mountains:
Part 1: http://g.co/maps/4622z
Part 2: http://g.co/maps/5j3du
No problems, just temps in the nineties.
Best, Randy
Thanks for your response and knowledgeable opinion. I have previously remove the restricting jet in the fuel line. I wish there was either a viable replacement for the fuel pump that was a plug and play solution or a way to eliminate the item from the circuit. But for now, I'll just ride 'till it fails. I had a great 220 mile ride yesterday mostly through the Santa Cruz Mountains:
Part 1: http://g.co/maps/4622z
Part 2: http://g.co/maps/5j3du
No problems, just temps in the nineties.
Best, Randy
1987 Ducati P750
1973 Honda CB450
2022 KTM RC390
1973 Honda CB450
2022 KTM RC390
- ducinthebay
- paso grand pooh-bah
- Posts: 1323
- Joined: Sat Sep 03, 2005 12:00 am
- model: 750 Sport
- year: 1990
- Location: SF Bay Area
Re: Paso 750 missing
I really should have been out there too. Great roads.
We should meet up at Alices for a ride some weekend.
Cheers,
Phil in Fremont.
We should meet up at Alices for a ride some weekend.
Cheers,
Phil in Fremont.
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.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
-
- paso grand pooh-bah
- Posts: 574
- Joined: Thu Oct 27, 2011 7:47 am
- model: 750 Sport
- year: 1988
- Location: Wollongong,Australia
Re: Paso 750 missing
Mc tool wrote:aussieAndrew2 wrote:I read and re-read the posts and could'nt figure out what you meant.Then I noticed the thread titlefredskidoo wrote:Jeez - you had me thinkin' someone stole you ride! Whew!
Cheers
Andrew
Good onya .Still flogged you on Friday night though
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- Posts: 247
- Joined: Thu Oct 22, 2009 10:38 am
- model: 750 Paso
- year: 1986
- Location: Mildura ,Australia
Re: Paso 750 missing
Try your local Auto parts store,I found a cheap fuel pump that bolted straight up to the existing mounts and was really easy to plumb in,and best of all it was the cheapest they had in stock.Still working fine after 3000 km's !randtcastell wrote: I wish there was either a viable replacement for the fuel pump that was a plug and play solution or a way to eliminate the item from the circuit. But for now, I'll just ride 'till it fails.
Here's what it looked like :
They are dead easy to wire in also. J.