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 Post subject: Dellorto
PostPosted: Mon Apr 24, 2017 4:57 pm 
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Joined: Mon Apr 24, 2017 12:55 pm
Posts: 4
Location: Australia
model: 750 Paso
year: 1987
Hi
New to forum. I have a 1987 750 Paso with Dellorto carbs. Not sure of size but will check. I have just had them cleaned and re kitted by a local Ducati mechanic. The bike sat for 12 months previous to this so they were all gummed up with old fuel and crud. This past Sunday I took the bike on a 200km run to a motorcycle festival and have found that I'm having a few problems with them.
1/ There is a strong smell of fuel coming from the exhaust and around the general area of the carbs when idling.
2/ The bike stalls sometimes when parked at traffic lights.
3/ The engine seems to run with a (how do I describe it) it's sort of a, barp, barpbarp, barp, barpbarp, barp type of sound. As if it is misfiring. (I'm 59 years old. That sounds almost foolish.)
I have no idea what size jets are in these carbs and the bike has a set of aftermarket mufflers on it. Maybe Staintunes. I've also read on some pages about there needing to be a return or y junction to the stopcock because of to much fuel. Previously I had also heard the ticking from the fuel pump when the ignition was turned on but did not notice that when I turned the bike on today, so maybe the fuel pump has given out. Also the wire has come off from the temp gague. 2 wires in the vicinity I think a white one and a light brown one. Not sure which is correct. I think brown. So I have no idea how hot this bike is running.
Thanks for any help or advice.


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 Post subject: Re: Dellorto
PostPosted: Tue Apr 25, 2017 11:30 am 
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Joined: Mon Apr 24, 2017 12:55 pm
Posts: 4
Location: Australia
model: 750 Paso
year: 1987
Ok so I have been doing a lot more reading. It appears that the fuel pump is not needed with Dellorto's so it's not a problem if it's not working. I also see that it may be a problem with the coils so I will check the voltage there tomorrow.


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 Post subject: Re: Dellorto
PostPosted: Wed Apr 26, 2017 5:14 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5084
Location: southern Germany
model: 750 Paso
year: 1987
Hello and welcome to the forum and +1 for trying to anwer your questions yourself. :thumbup: Seriously.
Your Dellortos are probably 36s. While some say you can run carbs w/o a fuel pump it's better to stabilize fuel delivery by keeping it and the return hose to the tank. The use of a fuel pressure regulator is quite common to reduce the risk of the carbs overflowing. The use of a vacuum fuel pump is another alternative.

Cloth braided fuel hoses often "sweat" with age which can be another reason for the smell of gasoline.

The wire to the oil temperature sender is the brown one (you find the wiring diagram in the downloads on top of this forum). A white-black one is the power supply of the fuel pump.

Let's see what your voltage is at the coils.

You should get yourself new tires btw.

G.


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 Post subject: Re: Dellorto
PostPosted: Thu Apr 27, 2017 2:26 am 
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Joined: Mon Apr 24, 2017 12:55 pm
Posts: 4
Location: Australia
model: 750 Paso
year: 1987
Thanks for the reply. I've been looking for vacuum fuel pumps and regulators but not to shure wich ones will work. Do you have any recomendations.
Thanks
Phil


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 Post subject: Re: Dellorto
PostPosted: Thu Apr 27, 2017 4:09 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1533
Location: Newzealand
model: 906 Paso
year: 1990
Carbed Ducati Monsters were fitted with them . :)

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I wish I was young again............Id be heaps smarter than last time


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 Post subject: Re: Dellorto
PostPosted: Thu Apr 27, 2017 9:53 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5084
Location: southern Germany
model: 750 Paso
year: 1987
I like the ones from a Yamaha TDM or TRX better as all connections show in the same direction.
Basically you can use every fuel pump (electric or underpressure) which comes from a carbed 750 or 900cc engine. No matter if it`s a 2 or 4 cylinder.


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 Post subject: Re: Dellorto
PostPosted: Fri Apr 28, 2017 11:14 pm 
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Joined: Mon Apr 24, 2017 12:55 pm
Posts: 4
Location: Australia
model: 750 Paso
year: 1987
Thanks again. I have just ordered a new vacuum fuel pump. I have new Golden Tyres on the bike by the way. They seem really good so far after 200km. My voltage meter seems to be broken so I will borrow one from work today and see what I get at the coils. It also looks like I am missing some lights on the dashboard so will start working on fixing that also.


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