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 Post subject: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Fri Jan 15, 2010 5:33 pm 
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Joined: Sat Oct 31, 2009 1:14 pm
Posts: 36
Location: Jacksonville, NC USA
model: 750 Paso
year: 1988
For all you Dellorto/Mikuni 'converts' out there, did you ever have any regrets in discarding your Webers?
I have two complete Weber setups at home that I am experimenting with, but I am not fully convinced that I will ever be able to set them up to my satisfaction, so I am considering the Dellorto/Mikuni conversion.
I am not concerned one bit about originality as much as rideability and reliability.

It's time to cast your votes!!
Rick

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Rick
2004 BMW K1200RS
2004 Royal Enfield Bullet 500
1988 Ducati Paso 750
1981 Honda CBX 1050

'It's not the kill, it's the thrill of the chase"


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Fri Jan 15, 2010 7:04 pm 
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Joined: Fri Nov 13, 2009 4:33 pm
Posts: 317
Location: San Francisco Bay, California USA
model: 750 Paso
year: 1987
I purchased my '87 Paso with 40mm Del'Ortos and I am very pleased with the set-up. The carbs are real easy to adjust or rebuild, and they are Italian, and they work w/o fail. No fuel pump in the system is, I believe a good thing. The Del'ortos are simple and appropriate to the 750 Paso methinks and that's my two cents. Best, Randy.


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Fri Jan 15, 2010 8:11 pm 
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paso grand pooh-bah
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Joined: Mon Jul 26, 2004 12:00 am
Posts: 3081
Location: Finland
Not big troubles with Weber(only that "flat spot" in 90-100km/h speed), but i wanted something better, so converted to 40mm Dellortos what were too big(and very thirsty!) for "not modified" 750cc engine, so i turned to Mikuni's (from 750ss). :mrgreen: :mrgreen: :mrgreen: :smoke:

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Fri Jan 15, 2010 11:01 pm 
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Joined: Tue Jan 17, 2006 12:00 am
Posts: 332
Location: Lower Hutt, New Zealand
model: 750 Paso
year: 1986
Rick,

I also have Mikunis, the difference from the Weber is remarkable. The bike idles sweetly (no stalling at lights) and no annoying flat spot, just pulls cleanly. The bike also feels more powerful.
Cheers,

Fraser.

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Fri Jan 15, 2010 11:54 pm 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1323
Location: SF Bay Area
model: 750 Sport
year: 1990
Can't tell you about the Weber, as i haven't ridden a bike with one on it. I have ridden three 750 Sports with 36mm Dellortos on them, and they run just like they should, and get up to 115mph on a regular basis. Haven't run the Mikuni setup yet, but I have one on the shelf waiting for the day I can put them on and try them.

Cheers,

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1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 12:47 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
the answer to the weber flat spot is coming soon. detailed info will be provided.Unleash the true beast in any weber for less than the cost of any conversion. FCR performance at 1/10 the cost
no leaky del, no choked down mikuni, no $1000 keihins required. just some minor jetting changes a drill and new auxiliary venturi and some wiring mods. If you are a regular here on the Paso.org
you most likely have 90% of the mods done already.

115mph hahaha how about 145mph and clean up and down,easy start and no flat spot. And a sound only a Weber can make on a Paso.

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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: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 1:20 am 
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Joined: Fri Jan 15, 2010 7:24 pm
Posts: 56
Location: Ashland, Ky, USA
model: 750 Paso
year: 1988
When I got my first Paso (a 906), I ordered a K&N air-filter and jets from the European Paso. Installed the jets, set the low speed needle jets, put in the filter, and adjusted the idle. Top speed went to an indicated 140 mph and driveability was spot on. So far I haven't altered anything on my new (to me) 750 Paso.... but I will........ :thumbup: :thumbup: :thumbup: ......

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 12:35 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5494
Location: southern Germany
model: 750 Paso
year: 1987
145mph with a stock bike is something you dream off unless that is just read off the speedometer which may indicate quite optimistic at that speeds :)
Top speed loss with carb conversions I guess are in most cases due to missing airbox. Top speed and open filters just don`t combine that good.


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 4:21 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
have not had time to verify with the gps,of course it is the speedo Still it runs clean all the way thru........ :thumbup:

My dreams? warm summer days and a nice ride well below 145mph :thumbup:

only time I get to go that fast is on the way to the Desmo picnic :lol: :lol: :lol: :lol: :lol:

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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


Last edited by higgy on Sat Jan 16, 2010 9:46 pm, edited 1 time in total.

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 5:28 pm 
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paso grand pooh-bah
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Joined: Mon Jul 26, 2004 12:00 am
Posts: 3081
Location: Finland
Gearing ratio(sprockets) makes also big difference to top speed... I dont need so much top speed (at all) here. With suitable sprockets Ducati behaves much nicer in city traffic and in curvey roads and U can beat very many jap bikers with suitable gear ratio in twisty roads(what fits very well to me!)... :mrgreen: :mrgreen: :mrgreen: That "top speed" is not so important. More important to me is behaving of bike/engine, gearbox, brakes, etc.... :thumbup: Now to hot Sauna! with :beer:

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KTM 990 Adventure -08 metal dark grey
Paso 750 -89 red/metal grey
Paso 907IE -91 red/metal grey
Paso 907IE -91 red
2xST4S -02 red/metal grey
ST2 -01 red/metal grey
Volvo V70 Bi-Fuel Classic/titanium


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sat Jan 16, 2010 6:54 pm 
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Joined: Fri Jan 15, 2010 7:24 pm
Posts: 56
Location: Ashland, Ky, USA
model: 750 Paso
year: 1988
Sometimes you can put on a bigger rear sprocket and actually go up in both speed and acceleration :idea: . I did this on my 900SS and gained a few mph because the bike would pull more rpms' in high gear. Before gearing it would run an indicated 130 mph (how ever fast that is) and about 134-136 afterward :shock: :shock: :shock: ...

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Mon Jan 18, 2010 3:20 am 
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Joined: Sat Oct 31, 2009 1:14 pm
Posts: 36
Location: Jacksonville, NC USA
model: 750 Paso
year: 1988
...waiting on that flat-spot answer, Higgy...
:beer:

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2004 BMW K1200RS
2004 Royal Enfield Bullet 500
1988 Ducati Paso 750
1981 Honda CBX 1050

'It's not the kill, it's the thrill of the chase"


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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Mon Jan 18, 2010 11:23 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
grand pooh bahs are proofing it, won't be long. Dotting "i's and crossing "t's" takes a little time. You will have a nice project for the rest of the winter :cool: :cool: :cool:
With a little luck we can release it into the wild next month
Have a few other ditti's to add as time allows. One is a trial of the Grose jet with our other mods. Also plan to see what works on the 750 Sport and Paso
Future additions will be on ECU remapping and Welding up 16 inch wheels to 17 inches.
Also would like to get a dyno run into the mix to verify our work and document top end speed maybe put a modded weber on the flow bench to see if there is any more
power to extract in a simple fashion with a minimum of fuss. :thumbup:

Romus has done a first rate job of putting all on paper :beer: :beer: :beer:

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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: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Sun Jan 24, 2010 9:13 pm 
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Joined: Mon Dec 31, 2007 2:07 pm
Posts: 27
Location: louisville, ky
model: 750 Sport
year: 1990
I am shopping the Dellortos now, but would love to explore simple repairs to the Weber, cleaned & rebuilt last year it did exactly what they said it would.............surge pop poof, still love the bike!
eh

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 Post subject: Re: Weber or Dellorto/Mikuni; Final Answer?!
PostPosted: Wed Feb 10, 2010 11:12 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3259
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Delayed release to add a section on cam timing :wacko:

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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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