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 Post subject: 39mm Keihin FCRs
PostPosted: Tue Nov 22, 2011 10:35 pm 
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Joined: Wed Jan 28, 2009 9:27 pm
Posts: 132
Location: Auckland, New Zealand
model: 750 Sport
year: 1988
Hi
anyone running these? I just bought a set and will fit and try to get them running this weekend so if anyone has some advice or tips please let me know. thanks

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Clive


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 Post subject: Re: 39mm Keihen FCRs
PostPosted: Tue Nov 22, 2011 11:07 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5227
Location: southern Germany
model: 750 Paso
year: 1987
It looks like the covers of the float chambers have been removed in the past. If that`s done the small rubber boot on the side/accellerator pump is pulled off.
The only thing I`d generally do with used carbs is get some carb cleaner spray and clean them inside and out.
Here`s all I have about Keihin FCRs. (I don`t have any, I have the Mikuni TDMR)
http://www.box.com/s/329ay6zzob9yspyisl01
As the Keihins don`t have a choke you give it two or three hits with the throttle before starting.
Also keep the throttle opening cable in it`s lowest position as it`s hung now or else the throttle slider won`t fully open. (as least that was so on my friends` Elefant I had in the garage the past 4 months)
The rear/higher T connection is the carb breather which you should connect to a small bottle like used on the Ducs with Mikunis.
If you end up having carb flooding issues you may consider swapping the electrical with an underpressure fuel pump.
That`s all that comes to my mind. :)

G.


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 Post subject: Re: 39mm Keihen FCRs
PostPosted: Tue Nov 22, 2011 11:43 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3187
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
put the weber back on it :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: 39mm Keihen FCRs
PostPosted: Wed Nov 23, 2011 12:31 am 
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Joined: Wed Jan 28, 2009 9:27 pm
Posts: 132
Location: Auckland, New Zealand
model: 750 Sport
year: 1988
thanks for the info guys.
thanks G, I already have removed the tank pump and run a low pressure vacuum pump so should be fine. I also rebuild all carbs i get so hopefully all good.
Higgy I sold the webber to a guy who was rebuilding a Ford capri V6 long before i read all your info on it. Have since been running 38mm Mikunis. Pity really as I would have liked to try it on the track now, but mine ran so poorly on the road, and not knowing anything about them, just got rid of it.

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 Post subject: Re: 39mm Keihen FCRs
PostPosted: Wed Nov 23, 2011 3:48 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1318
Location: SF Bay Area
model: 750 Sport
year: 1990
While you can run the manifolds from a Monster or SS,(which I believe you are already running) shorter manifolds are always better. If you get Malossi short manifolds, you can split the carbs. you will need to put elbows on the ends of the carbs to your aircleaners.

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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: 39mm Keihen FCRs
PostPosted: Wed Nov 23, 2011 10:49 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5227
Location: southern Germany
model: 750 Paso
year: 1987
Splitting those carbs is not so easy as you`ll need a second throttle linkage etc. Also short carb manifolds will shift the torque curve from low to high end which may be good for track use but imho less preferable for street use. I don`t agree they are always better.
Not being a fan of elbows in general and in special if they are too long, U-shaped etc these filters will fit:
K&N 2530 (was posted here in the forum before. I guess it`s SN-2530)
Image
Unifilter UP4060A (the Keihins shown have the SS/Monster airbox adapters mounted)
Image
Image
Raimair has filter socks that fit over trumpets (use cable ties to hold them)
http://ramair-filters.com/motorbike/fra ... rbike.html

G.

Btw if anyone knows of a spare/cheap set of Keihin FCR (41) inlet trumpets let me know


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 Post subject: Re: 39mm Keihen FCRs
PostPosted: Thu Nov 24, 2011 6:59 pm 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1318
Location: SF Bay Area
model: 750 Sport
year: 1990
I must admit, that I only speak from what I have heard about splitting the carbs, as I have not done it myself. But seeing them installed, it seems the faster, easier install is with them together, and use the longer manifolds. It also gives you a chance to actually make an airbox, and the airfilter situation is much easier to resolve. And you can put nice big/long intake velocity stacks (trumpets).

I keep searching to find a good deal on a set of FCRs, as I understand they are the best choice to get the most performance from the Ducati engine. I can't quite swallow $800 for a set. But Christmas is coming......

Cheers,

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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.


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 Post subject: Re: 39mm Keihen FCRs
PostPosted: Thu Nov 24, 2011 7:10 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3187
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Oh Boy FCR envy :mrgreen:

Shoulda kept the weber :lol: :lol: :lol: :thumbup: :thumbup: :beer: :beer: :wacko:

_________________
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: 39mm Keihin FCRs
PostPosted: Sat Nov 26, 2011 1:31 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3187
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Quote:
I keep searching to find a good deal on a set of FCRs


not to long ago there was a guy had several sets went for around 200, at least the first few till people found him on fleabay, so keep tryin :thumbup:


stacks http://www.ebay.com/itm/Velocity-Stack-50mm-Replacement-Blue-35-41mm-Qty-2-/190604596833?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item2c60eb5661


Manifolds http://www.ebay.com/itm/Ducati-SS-Monster-Intake-Manifolds-Keihin-Carbs-/250896425516?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item3a6a97a22c


for 175 they should be tricolor at least :wacko:

_________________
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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