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Old 09-18-2008, 11:33 PM   #1
White Nightmare
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Default V Twin Dual Carbs

Whats up fellas. I've heard on more than one occasion that a v twin can greatly benefit from running dual carbs. I guess its something to do with uneven vacuum or something like that. I was wondering what everyone's thoughts were on the subject.

-Chris
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Old 09-19-2008, 02:33 AM   #2
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Default Re: V Twin Dual Carbs

i ran a pair of mikunis from cycle xchange.pain in the ass,but i suck at tuning.i switched to an s+s. anyways do a search for dual carbs,or dual amals.its been covered a bunch.
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Old 09-19-2008, 02:57 AM   #3
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Default Re: V Twin Dual Carbs

I did search and didn't find much. I did find that amal carb thread but that was it.
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Old 09-19-2008, 04:26 AM   #4
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by White Nightmare View Post
Whats up fellas. I've heard on more than one occasion that a v twin can greatly benefit from running dual carbs. I guess its something to do with uneven vacuum or something like that. I was wondering what everyone's thoughts were on the subject.

-Chris

There's alot of information about dual carb setups in "The Linkert Book" from Victory Library.
http://victorylibrary.com/L-BK.htm
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Old 09-19-2008, 04:38 AM   #5
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Default Re: V Twin Dual Carbs

panhead, knucklehead, shovel or sportster ? makes a diff because of port design. have exp. with duals on all. let me know. happy motoring and via con Dios

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Old 09-19-2008, 01:04 PM   #6
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Default Re: V Twin Dual Carbs

Hi all,

That's what I did on my 54' KHK, some work...



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Old 09-21-2008, 02:27 PM   #7
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by thefrenchowl View Post
Hi all,

That's what I did on my 54' KHK, some work...



Patrick
Holy shit, is that a custom manifold?!?
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Old 09-21-2008, 04:52 PM   #8
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Default Re: V Twin Dual Carbs

Well, it's "custom" in that I made it meself!!!...T's been 3 years on the road, no probs.

http://www.harleykrxlrtt.com/twin_carb_manifold.htm

The "thing" in all its glory...



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Old 09-21-2008, 05:17 PM   #9
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Default Re: V Twin Dual Carbs

Wow, I'm impressed. My problem with those dual carb setups is that they often are a 2 into 1 into 2 manifold arrangement. Not yours though.
That is sweet.
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Old 09-21-2008, 05:46 PM   #10
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Default Re: V Twin Dual Carbs

I am running this 74" motor with a pair of 34mm Mikuni's. They hang from an old Kosman intake manifold, and the bike runs great. It takes a few primer kicks to get the bike to fire cold, but it runs nice with them.

I'm surprised to hear any probs with Cycle Exchange. Kenny has always been good to me, and his kits are nice too. I got the tuning info from Doug at Doug's Custom Cycles in GA, and they were easy to set up.
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Old 09-21-2008, 06:55 PM   #11
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Default Re: V Twin Dual Carbs

Got this dual Amal setup laying around ,might try it on one of my piles;anybody know anything about it? who made it, Etc.?

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Old 09-21-2008, 10:34 PM   #12
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by Fab Kevin View Post
I am running this 74" motor with a pair of 34mm Mikuni's. They hang from an old Kosman intake manifold, and the bike runs great. It takes a few primer kicks to get the bike to fire cold, but it runs nice with them.

I'm surprised to hear any probs with Cycle Exchange. Kenny has always been good to me, and his kits are nice too. I got the tuning info from Doug at Doug's Custom Cycles in GA, and they were easy to set up.
i love cycle x. i think the problem was me!the kit was super nice,and they are nice to deal with.the only thing i would have liked to see with the kit was longer threads on the cable fittings at the top of the carbs,but thats neither here nor there....
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Old 09-21-2008, 11:03 PM   #13
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Default Re: V Twin Dual Carbs

Thanks for the great responses fellas. It seems that every time I see a dual carb manifold for a Harley it always has a port of some kind that joins the two runners together. It seems like this port would defeat the purpose of a dual carb setup. Is there a reason that opening is there on most dual carb manifolds?

-Chris
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Old 10-13-2008, 06:41 PM   #14
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Default Re: V Twin Dual Carbs

Any other dual carb setups? Lets see em fellas.

-Chris
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Old 10-13-2008, 07:16 PM   #15
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Old 10-13-2008, 07:17 PM   #16
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Old 10-13-2008, 07:23 PM   #17
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Old 10-13-2008, 07:28 PM   #18
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Default Re: V Twin Dual Carbs

I have these dual-carb Panheads, set up for a matched pair of Amal 932's. They were started over 40 years ago by Pat Leahy, when he was still at B&O Cycles. Guess what? They still aren't finished. I spend money on them when I can. They too have two 1/8NPT plugs in the intake spigots. The plugs are supposed to come out, and a balance tube is supposed to connect the two spigots together. It's supposed to work like the balance tube between two exhaust pipes does, that's what I understand. They'll go on my "keeper" Pan when they're finished.

As a sidenote, I got the new Custom Cycle Engineering catalog about a week ago. There's a couple pictures of Pat when he was a "kid" on the inside cover. One is Pat sitting on Randy Smith's 45 Magnum when they were both building it, and the other one is the "crew" right before they helped Randy with his shoot for the famous picture of Randy holding up the 45 Magnum.

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Old 10-14-2008, 07:02 AM   #19
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Default Re: V Twin Dual Carbs

Here's a link that has some interesting ideas on dual linkerts and manifolds.
http://knuckleheadtheology.blogspot....age-style.html
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Old 10-14-2008, 10:37 AM   #20
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Default Re: V Twin Dual Carbs

I'd really like to see the other side of this engine. I'm curious about thr pushrod arrangement. Some details on the cam would be even better. Anyone?

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Old 10-14-2008, 10:44 AM   #21
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Default Re: V Twin Dual Carbs

is there an intake available for dual amals on an ironhead?
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Old 10-14-2008, 01:44 PM   #22
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Default Re: V Twin Dual Carbs

http://www.youtube.com/watch?v=5rtOG...eature=related
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Old 10-15-2008, 07:24 AM   #23
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Default Re: V Twin Dual Carbs

I ran Del Orto flat slides,And It was outstanding,It does take a little patience,And a lot of test rides to get it spot on.But its worth it.
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Old 10-15-2008, 09:44 PM   #24
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Default Re: V Twin Dual Carbs

We're building a dual carb Pan right now. Might run 2 CV's on it.
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Old 10-16-2008, 01:39 AM   #25
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Default Re: V Twin Dual Carbs

Thanks for the pictures and info fellas. I do have a question though. How important is it to have a balance/crossover tube between the two carbs. Did the XR bikes have any kind of balance tube fitted from the factory? I noticed that the KR earlier in this thread had a crossover tube between the two runners on the manifold. Thanks guys.

-Chris
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Old 10-16-2008, 07:12 AM   #26
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Default Re: V Twin Dual Carbs

On the bikes with an XR/Vincent style setup (each cylinder has intake on rear and exhaust on front), what do you do about cam timing? Do you reverse the pushrods on the rear cylinder (so the exhaust rod is opening the exhaust valve). Jock-E-Shift posted the video of that beautiful dual carb pan, but I couldn't see any closeups of the pushrod tubes.

I don't understand how it works on a single cam bike. Four cam is another story, where each valve has its own personal cam (XR750, for example). Can someone please school me? Seriously, I don't get it.
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Old 10-16-2008, 07:55 AM   #27
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Quote:
Originally Posted by Sporticus View Post
On the bikes with an XR/Vincent style setup (each cylinder has intake on rear and exhaust on front), what do you do about cam timing? Do you reverse the pushrods on the rear cylinder (so the exhaust rod is opening the exhaust valve). Jock-E-Shift posted the video of that beautiful dual carb pan, but I couldn't see any closeups of the pushrod tubes.

I don't understand how it works on a single cam bike. Four cam is another story, where each valve has its own personal cam (XR750, for example). Can someone please school me? Seriously, I don't get it.

On a single cam engine I would assume that a new cam would need to be made.
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Old 10-16-2008, 09:39 AM   #28
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by Sporticus View Post
On the bikes with an XR/Vincent style setup (each cylinder has intake on rear and exhaust on front), what do you do about cam timing? Do you reverse the pushrods on the rear cylinder (so the exhaust rod is opening the exhaust valve). Jock-E-Shift posted the video of that beautiful dual carb pan, but I couldn't see any closeups of the pushrod tubes.

I don't understand how it works on a single cam bike. Four cam is another story, where each valve has its own personal cam (XR750, for example). Can someone please school me? Seriously, I don't get it.
In both cases you need a special grind cam.

standard cam
EX / IN / IN / EX

two front heads:
IN / EX / IN / EX

Same for the 4 cam motors
the two front head cams spinns in reversed direction compared to the rear head cams, so they cant be switched out (and there's a few more reasons why you cant swap them)

But anyway
You'll need to get a special grind cam done.
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Old 10-16-2008, 11:37 PM   #29
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Default Re: V Twin Dual Carbs

Here is an interesting read.


Quote:
The combination of partial vacuum, intake pulses, and acoustic wave pulses within the intake tract leads to another counterproductive phenomena called reversion, or fuel "standoff." Reversion is the process where airflow in the intake tract reverses direction momentarily during the valve overlap period. Typically, reversion is accompanied by a fog of fuel or fuel standoff seen at the carburetor's entryway. Reversion negatively affects the carburetor's ability to accurately meter fuel. It also increases the tendency of some V-Twin motors to puke oil from the air-cleaner housing. Sometimes engine builders install a full or partial cover over the end of a velocity stack. The cover creates a plenum, which calms the airflow and minimizes the undesirable vacuum effect caused by stack shrouding.
The Harley V-Twin engine's uneven firing pulses exacerbate the reversion phenomena even more. The V-Twin's 45-degree cylinder angle dictates that the time between the intake pulses for each cylinder is different. For example, the rear cylinder fires 315 degrees after the front, and the front fires an additional 405 degrees after the rear, completing the 720 degrees of crankshaft rotation required for the four engine strokes. This sequence typically results in the front cylinder achieving greater cylinder fill. Moreover, much of the charge drawn into the V-Twin's intake tract passes the carburetor venturi three times. Firstly, the rear cylinder pulls air past the venturi on the intake stroke. Then the air left in the intake tract reverses direction because of the pulse generated when the intake valve closes. Finally, that same air passes the venturi a third time during the front cylinder's intake stroke. The fundamental design and harmonics of the V-Twin engine create a constantly changing fuel mixture throughout a wide rpm range. And the larger the displacement, the greater influence these pulses have on carburetion.



Source
http://www.hotrodsbikeworks.com/tech...tribution.html
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Old 10-17-2008, 06:17 PM   #30
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Old 10-18-2008, 04:30 AM   #31
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Default Re: V Twin Dual Carbs

White Nightmare:
Quote:
How important is it to have a balance/crossover tube between the two carbs. Did the XR bikes have any kind of balance tube fitted from the factory? I noticed that the KR earlier in this thread had a crossover tube between the two runners on the manifold.
Balance pipe is just there to help the iddle side of things, not strictly necessary. Mine on this 54 KHK (NOT KR sadly!!!) is actually a bit too small, carbs work fine so I've never made it any bigger.

XRs never had a balance pipe...

Patrick
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Old 10-18-2008, 07:18 PM   #32
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Old 10-18-2008, 07:19 PM   #33
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yeah i have a sickness. so what?
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Old 10-18-2008, 08:32 PM   #34
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Quote:
Originally Posted by thefrenchowl View Post
White Nightmare:

Balance pipe is just there to help the iddle side of things, not strictly necessary. Mine on this 54 KHK (NOT KR sadly!!!) is actually a bit too small, carbs work fine so I've never made it any bigger.

XRs never had a balance pipe...

Patrick

Thanks for the confirmation and info Patrick.


This thread is pretty awesome so far. Definitely some nice setups in here.

-Chris
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Old 12-31-2008, 08:11 AM   #35
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Default Re: V Twin Dual Carbs

el mirage record holder '92-'08....81.5 ci.....139.925 mph fastest pass as 84ci......official 143.815 (unofficial 147)
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Old 12-31-2008, 10:47 AM   #36
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Old 01-01-2009, 09:53 AM   #37
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Default Re: V Twin Dual Carbs

This Pan was at Daytona in 2008:

Patrick

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Old 01-01-2009, 10:37 AM   #38
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by thefrenchowl View Post
Hi all,

That's what I did on my 54' KHK, some work...



Patrick
Very impressive looking and must have been a lot of work. Can you tell if there is a power difference from the single to the dual carb set up?

I am running dual carbs on my 1949 Panhead bobber and will post images here next.
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Old 01-01-2009, 10:39 AM   #39
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Quote:
Originally Posted by JOCK E SHIFT View Post
Nice side-by-side Linkert set up on your Knuck. I am running dual Linkerts on my Panhead. Any issues with the velocity stacks on yours?
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Old 01-01-2009, 10:42 AM   #40
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Quote:
Originally Posted by JOCK E SHIFT View Post
Joe's dual carb Pan shown here is an amazing bike thathe built mostly out of NOS Harley parts. We photographed this bike last year and are running a full feature on it in the April 2009 issue of American Iron Magazine.

Joe is a very talented machinist and his bike bristles with amazing work. Great bike!
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Old 01-01-2009, 10:48 AM   #41
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My 1949 Dual Carb Panhead bobber. The heads were modified in the 1960s by Dudley's in Long Island.







It runs strong and I am still working on various details on the bike.
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Old 01-01-2009, 11:52 AM   #42
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Default Re: V Twin Dual Carbs

a little something I've been working on.

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Old 01-01-2009, 01:03 PM   #43
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Default Re: V Twin Dual Carbs

my dual carb setup along with left and right amal carbs
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Old 01-01-2009, 01:32 PM   #44
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Talking Re: V Twin Dual Carbs

The primary cover on this Pan gives me a woody!
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Old 01-07-2009, 09:59 PM   #45
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Default Re: V Twin Dual Carbs

So how did the S&S dual throat intake/carb setup work....good? Bad? What type of carbs were ran on these original setups? What year did they first come out?
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Old 01-08-2009, 08:53 AM   #46
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Default Re: V Twin Dual Carbs

we used to keep the stock manifod inlets on ours also and run a tube/plenum between the heads so each cyl. could draw from both carbs. intrupted flow some but they didn't flow that wellanyway coming out the left on both cyls. works best like setop in pic, ft...left facing rear...rear....rt facing ft. better for port shape. 115 hp. 84cid 139.9 mph (147 mph unofficial) ran a balance tube to idle at all for drags but like xr750 not needed at 7500-8000 rpm. if no plenum between carbs, run big carbs. 38-42 mm. carbs on ours 38 mm amals.
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Old 03-02-2010, 10:30 PM   #47
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Default lets see some dual carb v twins{that work}

since i dont have enough problems in my life i wanna try a dual carb setup on my hot ironhead, if i rememer right branch used to make a dual 38mm kit, anybody running duals? what size? im thinking common plenum to smooth out the tuning ...lets see what you got.
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Old 03-03-2010, 10:32 AM   #48
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Default Re: lets see some dual carb v twins{that work}

thefrenchowl on here has this k model. http://www.harleykrxlrtt.com/twin_carb_manifold.htm
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Old 03-03-2010, 11:37 AM   #49
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Default Re: V Twin Dual Carbs

Here's the Amal's on my Ironhead, manifold courtesy of TroyFab!



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Old 03-04-2010, 06:27 AM   #50
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Default Re: V Twin Dual Carbs

haven't seen any with dual SUs in this thread yet, so here's the setup on my '40 Knucklehead (no, the bike isn't finished).

-dan
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Old 03-04-2010, 07:57 AM   #51
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Default Re: V Twin Dual Carbs

this thread RULES! heres my stroker 45.
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Old 03-04-2010, 08:05 AM   #52
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a stroker 45, i bet that thing just sounds freakin righteous.

-dan

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Old 03-04-2010, 11:40 AM   #53
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Default Re: V Twin Dual Carbs

I have this VM29 Mikuni supercarbs for shovelheads. People say they are a bitch to tune is that so? I have a pretty cool set-up I was running. S&S heads with the 4 plugs & dual coils. I was also told that it has a big bore. It hauls pretty good with the s&s carb set-up. I was offered $300 for the set-up but dont know if I should sell it. What do you guys think?
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Old 11-26-2010, 10:10 AM   #54
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Default Re: V Twin Dual Carbs

I know this threads been down for some time, but I figured it'd be better to pull up an old thread for a related question than to start a new posting. I really dig the way those mikunis on FabKevin's scoot. The post said its an old Kosman piece. I was wondering if it was a piece they produced, or a custom one off. I know a lot of their business is one-off pieces.

Either way, I was hoping Kevin'd be willing to post a few more pictures of the intake. I'm tossing around big ideas for new exhaust and intake on a bike I don't even have yet, and vintage go-fast pieces like that are the cat's ass as far as I'm concerned.
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Old 11-26-2010, 01:11 PM   #55
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Default Re: V Twin Dual Carbs

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Originally Posted by OnVacation View Post
I know this threads been down for some time, but I figured it'd be better to pull up an old thread for a related question than to start a new posting. I really dig the way those mikunis on FabKevin's scoot. The post said its an old Kosman piece. I was wondering if it was a piece they produced, or a custom one off. I know a lot of their business is one-off pieces.

Either way, I was hoping Kevin'd be willing to post a few more pictures of the intake. I'm tossing around big ideas for new exhaust and intake on a bike I don't even have yet, and vintage go-fast pieces like that are the cat's ass as far as I'm concerned.
Cyclexchange sells the manifold and the carb setups. Good guy, I bought some stuff from him and talked to him on the phone. Check out his site and you'll see the kit he sells.

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Old 11-27-2010, 01:02 AM   #56
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Default Re: V Twin Dual Carbs

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Originally Posted by sixball View Post
Cyclexchange sells the manifold and the carb setups. Good guy, I bought some stuff from him and talked to him on the phone. Check out his site and you'll see the kit he sells.

Sixball
I saw the CycleX kits, which seem really nice. I was more hoping that the manifold Kevin had on his was a true dual runner intake, similar to the one on Buzz's Flattie. I like the look of the duals, but if I run dual carbs, I'd really prefer a true dual runner intake. Since Kevin said his was a Kosman piece, and Kosman is known well for their custom fabrication, I was hoping he may have a true dual runner intake.
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Old 11-20-2011, 12:21 PM   #57
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Default Re: V Twin Dual Carbs

I have a couple of questions about the factory KR dual tillotson set-up as described in the Competion Racer Model KR, KR-TT, and XLR-TT instruction. I'm working with a pair of HD carbs that appear to be modified in the way the instruction describes with the 12 degree velocity stack on the inlet end and the fixed Idle adjustment screw on the rear carb.

1) The picture shows a lever added to the oposite side of the throttle shaft assembly where the accelerating pump lever would go, but makes no reference to it in the instruction. I was ready to bolt up the linkage and found that the hole on the throttle lever is quite a bit less than the 10-32 ball stud on the P-103-S ball joint. Looking into it I found that I was working on the wrong side of the throttle lever assembly and there was an additional part. Is that correct? Any ideas about sourcing it?

2) The carb pair I have is missing some parts and I'm sourcing from a box of stock carbs. In picking throttle shutters, I have a pair that fit easily but have a small gap all the way around between the disk and carb throat. I also have a pair that fit the throat exactly but not into the throttle lever assembly slot. how important is a tight fit?

3) It appears that there are some additional adjustment needles for where the main jet plug screw would go. Its on the opposite side of where the intermediate adjustment screw is. Should I use them or source stock main jets?

4) I got two diaphram covers in the box o' carbs that look like the snowmobile kind. They ok to use? they fit.

5) For the clamp that bolts to the back of the intake manifold between the cylinders, I'm just going to cut it out of a 1" nipple from a plumbing store. Any better ways?

6) The illustration in the factory material shows no use of choke. I'm going to put this set-up on a KHK for street use and keep the choke. Any advice other than trial and error?

Thank you,

richie

PS hi Patrick, this is the same project from 4-5 years ago on your site. I got married and had two kids in the interim. slowly getting some time freed up after bedtime.
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Old 03-18-2012, 03:20 PM   #58
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Default Re: V Twin Dual Carbs

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Originally Posted by scraper View Post
is there an intake available for dual amals on an ironhead?
These dudes sell one. http://www.trumpnut.com/shop/Cycle-P...ld/prod_3.html
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Old 03-18-2012, 04:06 PM   #59
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Default Re: V Twin Dual Carbs

Dual Amal 930 intake for Ironheads.
http://mcleanmetalwerks.com/carb.htm
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Old 03-18-2012, 05:12 PM   #60
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Default Re: V Twin Dual Carbs

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Dual Amal 930 intake for Ironheads.
http://mcleanmetalwerks.com/carb.htm
These dudes sell one. http://www.trumpnut.com/shop/Cycle-P...ld/prod_3.html

Looks like both of your links offer the exact same handmade intake. Even the descriptions in each link are almost the same wording...so why does one cost exactly $100.00 more than the other?
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Old 03-18-2012, 07:57 PM   #61
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Default Re: V Twin Dual Carbs

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Originally Posted by kickstarts View Post
These dudes sell one. http://www.trumpnut.com/shop/Cycle-P...ld/prod_3.html

Looks like both of your links offer the exact same handmade intake. Even the descriptions in each link are almost the same wording...so why does one cost exactly $100.00 more than the other?
The wonders of capitalism - I personally love it!

Make it yourself: $20

Buy it from somebody who makes it: $125

Buy it retail from the yuppycatalog: $225

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Old 03-18-2012, 09:10 PM   #62
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Default Re: V Twin Dual Carbs

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The wonders of capitalism - I personally love it!

Make it yourself: $20

Buy it from somebody who makes it: $125

Buy it retail from the yuppycatalog: $225

Finally deciding to learn fabricating skills: Priceless!
Oh, I'm with you, I just found it strange that the same intake was advertised 2 places with the same ad copy but such a diparity in pricing between the 2 sites.

It's not even a manifold, it's a manifold adapter. I'd at least expect a dedicated manifold for $225.
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Old 05-06-2012, 04:58 PM   #63
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Default Re: V Twin Dual Carbs

here picture of a set i just finished up



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Old 05-06-2012, 04:59 PM   #64
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Default Re: V Twin Dual Carbs

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Old 04-15-2014, 03:51 PM   #65
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Default Re: V Twin Dual Carbs

A friend of mine who knew I was looking for heads for my 48 sent me a craigslist link to these yesterday. before I could even decide if this was even an option for me I called the dude up and made the purchase before someone else snagged them up. I was told these were done by Jerry Branch back in the 80's and the guy I bought them from has had them since the esrly 90's and never did anything with them. It will be interesting to see how these work out and the new direction it has taken this project to.




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Old 04-15-2014, 04:30 PM   #66
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Default Re: V Twin Dual Carbs

Makes me Giggle quietly.....
Beemer guys and such with dual carbs working hard to convert to single Carb...Harley guys [and other single carb designs] dying to go Dual Carb......
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Old 04-15-2014, 06:41 PM   #67
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Default Re: V Twin Dual Carbs

Quote:
Originally Posted by hatch View Post
Yeah....more carbs=more trouble.....but they look SOOO COOL!!!!.....
By coincidence...Friend called today. Got his Outlaw Street DragBike ready with brand spinnin Dual runner Injection system...said to me
"wait till ya see it ..It's Baddass lookin"
I'll see it at the April BowlinGreen Harley Drags...
Maybe even get a Pic for ya!!!!!
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Old 04-16-2014, 10:17 AM   #68
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Default Re: V Twin Dual Carbs

Real dual carb heads get rid of three 90○ turns in the intake. Seems like a no brainer. Dual carbs with one intake= waste of money that probs flows worse. Imo
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Old 04-16-2014, 11:51 AM   #69
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Default Re: V Twin Dual Carbs

qoute;"By coincidence...Friend called today. Got his Outlaw Street DragBike ready with brand spinnin Dual runner Injection system...said to me
"wait till ya see it ..It's Baddass lookin"
I'll see it at the April BowlinGreen Harley Drags...
Maybe even get a Pic for ya!!!!!"

Well, i for one, would love to see a pic of that! Not sure what a "brand spinning dual runner injection system" is but i know that from a performance and longevity standpoint, EFI or FI is the way to go! In the last 35 yrs of owning these type vehicles, i believe i`v had just about every type on the market. From the Bosch fuel distributor systems to the std electronic port injected systems, that i consider to be the best. Knowing that the Bosch electronic trigger`d systems were fired in sets of two,led me to mod a single carb Triumph intake for two Bosch injectors, pointed straight at the intake valve. The stumbling block was how to re-map the ECM for a shorter "spray" time for the large automotive style injectors. Nobody was doing that stuff back then, getting your ECM re-mapped now is somewhat commonplace!
However,before i got somewhat competent on these systems, someone gave my wife a very clean Volvo wagon with an engine compartment wiring harness that was irretrievably screwed! [someone had cleaned the engine compartment with an corrosive cleaner that softened up the insulation on the wiring harness to the consistency of peanut butter.] never did see injector reference via the "noid" light nor did it ever kick the fuel pump on. [although i could hotwire the fuel pump and it did pump] So i did the only thing a hillbilly with a welder would do, and thats build a stub manifold for a Weber "sidedraft" carb that i got in a trade! did away with the external hi-pressure fuel pump and added a "clicker" type electric lo-pressure pump. That car ran quite reliably for a # of yrs after. Not as good as if it still had the timed injection system, but good enough for the ole lady to run grocery`s in!
My ? is this, has anybody ever tried the Weber on dual throat Harley? Was the S&S dual throat a Weber type carb? Did they get it right? The Euro-type gearhead i got this carb from said they were a race upgrade for the Cortinas and Volvo engined MG`s and such that required the sidedraft configuration.
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Old 04-16-2014, 11:51 AM   #70
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Default Re: V Twin Dual Carbs

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Originally Posted by foureasy View Post
Real dual carb heads get rid of three 90○ turns in the intake. Seems like a no brainer. Dual carbs with one intake= waste of money that probs flows worse. Imo
I hope my experience setting these up proves to be that...
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Old 04-16-2014, 02:45 PM   #71
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Default Re: V Twin Dual Carbs

They look like they'll work great. And they're setup for readily available spigot type carbs, of which smaller ones might make it runner better on the street.
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Old 04-16-2014, 04:25 PM   #72
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Default Re: V Twin Dual Carbs

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Real dual carb heads get rid of three 90○ turns in the intake. Seems like a no brainer. Dual carbs with one intake= waste of money that probs flows worse. Imo
I have duals on one intake and it runs beter than on the super E

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Old 04-16-2014, 04:28 PM   #73
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Default Re: V Twin Dual Carbs

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I have duals on one intake and it runs beter than on the super E
Are those 30mm Mikunis?
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Old 04-16-2014, 05:36 PM   #74
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Default Re: V Twin Dual Carbs

I had that same set up, dual 28mm mikunis, ran a cycle x manifold. worked well.
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