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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through October 21, 2004 » Carb query - anyone with Weber downdraft?? « Previous Next »

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Kaudette
Posted on Saturday, October 16, 2004 - 05:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Anyone out there set up a Buell with a Weber carb? Twin 40mm downdraft too much for a 1200?

Bueller....Bueller...

Thanks in advance!
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Rick_a
Posted on Saturday, October 16, 2004 - 05:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I think not. I've thought about that myself. Someone's going to do it eventually.

A stock carb/throttle body is basically only feeding one cylinder at a time. Theoretically more power would be available with dual carbs/throttle bodies as it'd eliminate cross- scavenging and excessively high intake velocities at high RPM.

Go for it!
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Wyckedflesh
Posted on Saturday, October 16, 2004 - 06:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Not sure what carb Bud from Denmark is running (which reminds me...Bud I haven't had the chance to get the shipping cost together yet...) but he is running a downdraft carb.
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M1combat
Posted on Saturday, October 16, 2004 - 08:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Appleton HD in WI tried it... Not with that carb though.
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Wyckedflesh
Posted on Saturday, October 16, 2004 - 09:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

coughIowacoughHDcoughnotcoughappletoncough

They used a Jetski downdraft carb.
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Glitch
Posted on Saturday, October 16, 2004 - 11:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Didn't someone use a Honda carb?
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Odie
Posted on Sunday, October 17, 2004 - 12:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

More fuel would be good but the heads needs to be flowing good enough to use the fuel though. I know Thunderstorm heads are good but just something to think about. Sort of like a car being "over-carbed"......
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Wyckedflesh
Posted on Sunday, October 17, 2004 - 01:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Odie it isn;t a flow problem from what I understand, its a supply problem, IE: the carbs can't seem to keep up wiht the demand...
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M1combat
Posted on Sunday, October 17, 2004 - 01:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Oh yeah... he he... Waterloo Iowa : ).
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Bud
Posted on Sunday, October 17, 2004 - 03:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

bud from denmark...ahum coughcough

i'm from the NETHERLANDS...

and no the carb is not on my bike,
but on a bike from a friend off mine
and it's a carb form a honda firestrom a 48 mm downdraft
it took a wholelot off time to even get the thing running ( new jet's and all ) right, and it's still far from perfect ( running 1:10 )and fuel starving over 5000 rpm ( it suck the bowl empty )
that's something for this winter to fix
but thats on a 88" xb engine setup ; )
i't not something i would recommand
better try a weber downdraft from a porsche ( 4 cyl. ) or something
or better jet, put a fancy Fi on it
( i'm not saying that the stock Fi isn't fancy or crap, i't just not tunable )

gr,B

ps. wycked...
i got the t-shirt waiting : )
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Mrh
Posted on Sunday, October 17, 2004 - 05:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

'87-'88 Ducati 750 Paso used a Weber 44 DCNF two-barrel carb.

(Message edited by mrh on October 17, 2004)
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Kaudette
Posted on Sunday, October 17, 2004 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

tks for the great input so far - Dual 40mm downdraft Webers it is...
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Rick_a
Posted on Tuesday, October 19, 2004 - 01:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Sweet.

I read somewhere online about a shop that put dual CV's on an S2...I don't remember what heads they used. It took them a lot of experimentation to get them jetted correctly but that thing made some serious power. Tilley did the same with their Pro Thunder bikes, too.
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