Manifold to Carb

gprust · Nov 12, 2012

Hey all,

I made the jump and bought a single flat slide 34mm Mikuni to replace the single old round slide carb on my 71 Commando. When I removed the old carb, obviously, I removed the tube connecting it to the intake manifold. I don't know what brand the manifold is, but it looks like it is stamped with "SI" on the top. Someone used what looks like a piece of radiator hose to connect the two. And because I switched to the flat slide, I trimmed the rubber tube to help the fitment of the carb.

My question is this: I was wondering if there is a proper tube to use, or should I try to fit the old tube back into place?

Thanks in advance for the help.

cmessenk · Nov 12, 2012

Give the guys at Sudco a call...they'll be able to hook you up.

http://www.sudco.com/

mikegray660 · Nov 12, 2012

without seeing it - if you mean an old mikuni round slide? then something like this? says VM but TM fits too

http://www.ebay.com/itm/Mikuni-Carburet ... 5b&vxp=mtr

if its a single manifold for a amal 932 then a mikuni flange won't bolt on properly (holespacing is different)

gprust · Nov 12, 2012

I talked with sudco and they said they didn't have what I was looking for.

There's nothing for the rubber tube to bolt to. I'm not so much looking for a flange and just a tube.

RoadScholar · Nov 12, 2012

I may be able to help you. Call the shop tomorrow afternoon (after 2 PM est) and I'll see what I can do for you, assuming that you haven't solved your problem by then.

RS

pete.v · Nov 12, 2012

How about a picture of your manifold?

rpatton · Nov 12, 2012

Is this what you need?

cmessenk · Nov 12, 2012

pvisseriii said:
How about a picture of your manifold?

Yes, please send a photo of your carb and intake manifold with the "tube" removed. I just went out to take a look at my TM34 and my carb to manifold adaptor looks very similar to what mikegray660 posted.

Matt Spencer · Nov 12, 2012

Cunning swine use REINFORCED radiator tube, from Bulldozer / industrial source . IF they have to use a coustom piece. As it WONT Split . Wich could lead to trouble .Why I know a H2 thats big end went after the rubber tube split , scrap metal .

geo46er · Nov 13, 2012

Hi,
Clubman racing sells the type of one-into-two manifold that you must have. I don't know if they could sell you the rubber tube but you give them a call and find out.

http://www.clubmanracing.com/carbsandkits.php

GB

gprust · Nov 13, 2012

So I took a second look at it last night.

I didn't realize it Sunday night that I could remove that dark grey flange. Which looks like someone fabricated.

I suppose my question now is whether it's better to buy the rubber flange like mikegray660 shared or order a metal one like those from clubman racing and some tube like rpatton posted?

Too much stuff to buy but I don't know what the right solution is.

Thanks in advance for the help.

J.A.W. · Nov 13, 2012

Have a look at the J.P.N. Monocoque thread currently running,[viz, Steve A`s recent post] ,- he has posted a link to a photo of a `74 spaceframe which clearly shows the Amal Mk 2 Concentric mounting sleeve you require, - from memory, it has internal ribs that locate positively, but if you go with a cut off hose section you may have to use some kind of adhesive or mechanical means of preventing it slipping off, even when hose clamped.

pete.v · Nov 13, 2012

What you have there will work, I guess, if you can find the right piece of tube to couple up to that carb. What does the outside measure up to be.

Before you go and buy a 34mm adapter, measure your flange mounting bolt hole to adapter centers. There are 2 different ones. If your manifold is for a 36mm and above, the mounting hole will be too wide for the 34mm flange.

If you have to, I have opened a 34mm flange hole before to fit on a 36mm manifold. I recall the flange part itself has metal impregnated with the rubber around it so it was fasten able. Much less cost than buying a new manifold. What you have may have been a solution to the differance in centers hole measurments. Do some checking.

By the way, you WILL love that TM34.

J.A.W. · Nov 13, 2012

Why not spring for a 2nd TM 34, & run both? HVC Cycle [on line store] sells them for a reasonable price - they will pre-jet for you like-wise.

mikegray660 · Nov 13, 2012

just buy that flange and be done with it - for some $30 it is the right part and not some monkey piece of sheet - the carb will fit right and it will be a airtight seal - the VM34 and TM34 both will fit the same flange (i've switched them out to compare the VM to the TM - there is a minor bit of difference of the TM over the VM @ higher RPMs - a stock bike putted around may not show much difference as the VM is an excellent carb too)
:shock:

gprust said:
So I took a second look at it last night.

I didn't realize it Sunday night that I could remove that dark grey flange. Which looks like someone fabricated.

I suppose my question now is whether it's better to buy the rubber flange like mikegray660 shared or order a metal one like those from clubman racing and some tube like rpatton posted?

Too much stuff to buy but I don't know what the right solution is.

Thanks in advance for the help.

cmessenk · Nov 13, 2012

geo46er said:
Hi,
Clubman racing sells the type of one-into-two manifold that you must have. I don't know if they could sell you the rubber tube but you give them a call and find out.

http://www.clubmanracing.com/carbsandkits.php

GB

Hey, Geo, just curious if you're heading on down to Florida this winter?? I moved to a new house off the beach last year and would be happy to meet up and have a beer / coffee if you find yourself in the general neighborhood. Send me a PM if it's a "go".

Manifold to Carb

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