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 Post subject: paso con mikunis 750,,,no funciona bien
PostPosted: Thu Dec 29, 2016 9:19 pm 
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Joined: Mon Mar 18, 2013 3:55 pm
Posts: 14
Location: ALMERIA,ANDALUCIA,SPAIN
model: 750 Paso
year: 1988
Hola, os escribo en español porque creo que sera mas facil traducir que escribir yo mal en ingles.
Tengo una ducati paso 750 años 88..y le compre unos mikuni buevos de los que equipaban las ultimas ducati monster...compre los chicles y los difusores recomendados para la ducati paso en las tablas publicadas en esta pagina.
Funciona bien..arranca..etc...pero no puede subir a mas de 120 km/h ni en 4ª ni en 5ª velocidad...no anda mas.
Me podreis ayudar y decirme que hacer con ella?
Muchas gracias


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Thu Dec 29, 2016 11:34 pm 
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Joined: Fri May 01, 2015 9:31 pm
Posts: 55
Location: Australia
model: 907 I.E.
year: 1991
To me this sounds like a tuning issue at high load, large throttle which lots of people have commented on the forum.

have you read the tech article - viewtopic.php?f=1&t=705 (go down the page to the mikuni section) which will help you work out what you have and what jets you might need.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Fri Dec 30, 2016 9:06 am 
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Joined: Fri Jul 24, 2015 11:21 am
Posts: 129
Location: Belgium
model: 750 Paso
year: 1989
Hi Pepe,

https://translate.google.com/m/translate

This might help. .... :thumbup:

_________________
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Fri Dec 30, 2016 11:29 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5011
Location: southern Germany
model: 750 Paso
year: 1987
first of all there are numerous questions to answer:
- what is the complete and exact jetting of your Mikuni (from which Monster did it come from?)
- what exhaust are you using?
- what airfilter or airbox setup are you using?
- what spark plugs are installed?

While throttling from the carb running too rich can cause bad acceleration and limit speed it`s more likely it`s running too lean in which case you shouldn`t use the bike until the jetting is corrected. How do the sparkplugs look like? Are they black/wet or are there signs of them getting too hot? How does engine temperature behave and do the headers show any signs of discolouration?
Without knowing the answers to these questions one can only guess.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Fri Dec 30, 2016 4:39 pm 
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Joined: Mon Mar 18, 2013 3:55 pm
Posts: 14
Location: ALMERIA,ANDALUCIA,SPAIN
model: 750 Paso
year: 1988
Hello, the mikuni are the originals for ducati, unused, with: main jet 140, air 70, needle jet. Y-6 - jet needle - 5c19 in 3th from top - pilot jet 40 - air - 60 / 1.4.
Gio ca Moto - scape ... and v & h in the air
It does not want to rise of revolutions ... and until there, it works apparently well.
The candles color cafe au lait and are not wet


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Fri Dec 30, 2016 6:16 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5011
Location: southern Germany
model: 750 Paso
year: 1987
what does "v & h in the air" mean?
Except to the pilot jets it`s the original 750SS jetting used on an engine with an aftermarket 2in1 exhaust and foam filters on the Mikuni (without an airbox)? It is definitely running lean.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 12:24 am 
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Joined: Mon Mar 18, 2013 3:55 pm
Posts: 14
Location: ALMERIA,ANDALUCIA,SPAIN
model: 750 Paso
year: 1988
hi,it means filter conic for the mikuni,without box
What is necesary to go well?
i think im near of it..near of the ok...but,,, already isnt well
tel me what can i do,,,please!!!


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 5:46 am 
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Joined: Fri May 01, 2015 9:31 pm
Posts: 55
Location: Australia
model: 907 I.E.
year: 1991
Frank.61 wrote:
Hi Pepe,

https://translate.google.com/m/translate

This might help. .... :thumbup:



Yeah, my spanish is rudimentary but i never expected a carbie would translate as an egg.

:-)


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 5:48 am 
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Joined: Fri May 01, 2015 9:31 pm
Posts: 55
Location: Australia
model: 907 I.E.
year: 1991
paso750 wrote:
what does "v & h in the air" mean?
Except to the pilot jets it`s the original 750SS jetting used on an engine with an aftermarket 2in1 exhaust and foam filters on the Mikuni (without an airbox)? It is definitely running lean.


I'd agree... without changing jets you could just restrict the airflow and see if makes a difference. Would only take 2 minutes.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 11:18 am 
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Joined: Mon Mar 18, 2013 3:55 pm
Posts: 14
Location: ALMERIA,ANDALUCIA,SPAIN
model: 750 Paso
year: 1988
ok,ill restrict the air flow..and tell you if my bike go to....be well or not.
i havent my bike now here...but soon ill see if is ok or not this action


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 12:33 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5011
Location: southern Germany
model: 750 Paso
year: 1987
Restricting airflow is a good test to prove what seems obvious. But it`s just to verify, it`s not a solution.

Before you try other jets do move the clip of the needle from 3rd to 4th notch from top and see what difference that makes.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Sat Dec 31, 2016 4:12 pm 
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Joined: Thu Nov 29, 2007 2:38 am
Posts: 253
Location: UK
model: 907 I.E.
year: 1990
is not only a matter of Airflow, it could also be turbolence caused by the speed that is effecting the airflow

Airboxes are there for a reason, is not only to hold the filter , but also to create an enviroment of calm air.

I dont think removing it is a wise move, better having the carbs fitted with a modded airbox.

Years ago I was visiting a well known Italian tuner and I was puzzled about a mod they use to make to the 748SP, SPS & RS airboxes, basically they where putting a small diafram in front of the airbox openings so that the air entering had go around it and slow down a little and by douing this the turbolence would be lower. That little mod was worth 2BHP extra over a certain speed and RPM.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Mon Jan 02, 2017 1:25 am 
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Joined: Fri May 01, 2015 9:31 pm
Posts: 55
Location: Australia
model: 907 I.E.
year: 1991
angelix wrote:
is not only a matter of Airflow, it could also be turbolence caused by the speed that is effecting the airflow



I agree, you only have to meddle with a modern Japanese bike airbox and see how quickly you loose low speed throttle response or get strange flat spots. I remember fitting a GSXR1100 filter to my GSXR750 back in the early 90's (before i rode Ducatis) and loosing all power... the "only" difference was the inlet hole for the 1100 filter was a few mm bigger...

My suggestion to restrict airflow was just to see if enriching the mixture is the direction of the solution, not an optimum suggestion. You can quickly tie/cable tie a rag around the filter and go for a ride and see if you can pull over 120km (where he ran out of puff) and if you don't have any confidence fiddling with carbies it's an easy check to see if you need to learn more about the jets etc.

It's a classic way of testing one's limited knowledge of how a carbie works.

It might also stop him leaning the motor out excessively riding it to a more knowledgeable mechanic.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Mon Jan 02, 2017 4:51 am 
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paso grand pooh-bah
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Joined: Tue Oct 26, 2004 12:00 am
Posts: 1308
Location: Kapiti, New Zealand
model: 750 Paso
year: 1988
:cool:



With this kind of problem it's always a good idea to make sure the carburetors are getting all the fuel they need at the bigger throttle openings.


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 Post subject: Re: paso con mikunis 750,,,no funciona bien
PostPosted: Thu Jan 05, 2017 11:01 pm 
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Joined: Mon Mar 18, 2013 3:55 pm
Posts: 14
Location: ALMERIA,ANDALUCIA,SPAIN
model: 750 Paso
year: 1988
Hello again, after getting my ducati Paso to work acceptably, began to fail, when I went from being dead, to get first gear and try to roll with it, began to fail and did not let up revolutions, was momentarily in a Cylinder. I have the impression that there is an electric fault that ends in a combustion fault.
What can it be now? I'm demoralized with my bike, I'll never get it to work well?


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