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carburettor for Inter

Forums

Hello, I´m rebuilding a 1948 international from

parts for use on street.

What would be the best carburettor for this purpose.

Thanks Kurt

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From my experience of using a TT carb, a racing DellortoSSi and a pre -monoblock 289 on the road  I would suggest one with a tickover!. The 289 or similar would be my choice as I looks the part. I would still carry a small fire extinguisher though and protect the mag from drips.

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Agree with Robert that a TT carb can be a bit tricky to set up for road use. My 16H has it's old 276. The ES2 has a Monobloc. The Comet has a Concentric. The Venom a Mikuni VM. All runs well for road use. As you intend to use the Inter, it doesn't need to be exactly original. A Monobloc is not a bad choice, almost period. Try to figure out what is easiest to fit to the engine. If you are familiar with setting up an AMAL, go for one. The Mikuni VM is quite easy to set up too, only thing is that there could be a problem finding the right needle. If you have a friend who is better on setting up a carb than you are, choose one he is familiar with. An old worn instrument with worn throttle and jets + clogged drillings can give you extra problems.

Good luck, Mike

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Hi, I have a '37 Alloy Inter motor in a post war Manx plunger frame which is used on the road

the TT carb was well worn, so ordered up a new AMAL 930 Concentric from Surrey Cycles who jetted it accordingly. Worked perfect straight out of the box, it starts easy and even ticksover. I added a long intake trumpet as well. So wouldn't hesitate to use one of these plus they are relatively inexpensive.

All the best Simon

Concentric Carb for Inter

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Hi Kurt,

   I also agree with Robert as I used a 289 on my Inter many years ago and it is possible to bore them out to 1+5/32" which is the Inter size. 15 degree float chambers are available and if you use a Monobloc 375 long type bell-mouth it all looks very convincing. If you use a Monobloc carb check the plastic float as these could deteriorate with age and modern fuels.

   The TT.carb gets some bad comments, but you can get a tick-over, you have to adjust the cable so the slide hangs on the cable. When you turn the handlebars it might make the engine speed up a little, but it's not really a problem. Starting is just a matter of practice, so try different settings until you find the best set-up for cold and hot starting which will not be the same, it seems the amount you flood them that is the tricky bit !

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I have a 500cc clubman  inter from 1952 which has a TT carb and it causes me trouble when hot, or pulling off from cold.

 Anyone know what the settings are, especially the throttle cutaway.  Mine has a 7 cutaway on inspection which I think is too large and causing problems with overheating (weak mixture?)

 A friend lent me a 930 concentric set up for his inter and that has a 5 cutaway but on opening the throttle 1/4 plus it knocks out black smoke and misfires - rich mixture, (although works perfectly on his standard inter)  ..any ideas anyone

  

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Hi Mark,

   The type of silencer or exhaust will affect your carburation, especially regarding the slide cut-away. If you have the borrowed 930 fitted you will probably need the same silencer as your friend. Also if you have Manx cams, this might affect the pick-up, depending on how they have been timed.

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I've just started riding a prewar Inter. It has a brass TT carb refurbished by PO. As far as I'm concerned it just does its job. Maybe a different one might do it differently. Tick over is dealt with rather crudely by hanging the slide from the cable, with a big knurled lock nut to help. That must be locked or unexpected things may occur.

The TT looks decorative, which surely is much of the point in riding such a noisy and oily beast!

Mark...I'll look up the notes on cutaway etc. when I get home from work.  Mine is prewar but notoriously they scarcely changed! At about £50 per slide  there is a limit to how much you can afford to experiment.

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David / John

 thanks for the replies and your help.

 I have a straight through (although its silencer shaped) and I was told it had race cams.

 The Amal carb co also lists a 7 cutaway as standard on its website but any manual I have seen its a 5 or 6 

Any help or advice appreciated

 Kind regards

 Mark

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For what it's worth  these are the details of mine according to the notes in my possession.

Flange marking 34/041  10TT 34

Needle 10, middle notch of 7

Needle jet 109

Main jet 320

Bore 1 + 5/32"

Throttle slide 6 (cut away 3/8")

 

 

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