carbs Help needed identifying emulsion tubes

[Nelson]

Hi everybody,

I've never started a new topic, so please feel free to take the pi$$.

I'm trying to fit a set 38mm Mikuni carbs to my Sladsibe 1100

 

0

 

 

So I thought I'd get them a set of new emulsion tubes from Robinsons.

However, when they arrived, they are completely different to the originals.

 

 

 

The originals have a series of holes down the sides (like every other set I've seen).

The new ones are solid tubes.

Also the holes down the centre are tiny compared to the originals.

The needles don't fit down them. 

I contacted Robinsons to check, & the part numbers check out, but they are looking into it.

The carbs were suppose to be off a standard GSXR 750 with airbox.

Anyone any ideas ? 

 

 

[Duckndive]

Look like early 1100. "K , L"  Slingshot Carbs

[Nelson]

They have the 'power-jet' rudder tube thing, thought they were a 750 carb.

[Jaydee]

2 hours ago, Duckndive said:

Look like early 1100. "K , L"  Slingshot Carbs

I know it could've been added after but 11K/L carbs don't have an extended idle screw cable. The carb tops look tall (might be wrong, tiny photo), like what's on b12 and water cooled 750/11's.

You can narrow down the search by checking the if the carbs are designed for single cable or dual push pull cables. Also measure the internal bore, (36, 38mm?) and the spacing.

My guess (and just a guess) would be water cooled 750 (pre SRAD).  

[Nelson]

They measure 38mm, are single cable & have the power jet system.

they are suppose to be GSXR 750 M 1992

[Captain Chaos]

powerjet, idle adj. cable, choke knob on carb bodies, 38mm, all the signs of being 750 L/M carbs. 750W has choke lever on handlebars.

They could be from a USA bike in which case the jetting is completely different (127,5 main jets for example).

[Duckndive]

11 hours ago, Jaydee said:

I know it could've been added after but 11K/L carbs don't have an extended idle screw cable. The carb tops look tall (might be wrong, tiny photo), like what's on b12 and water cooled 750/11's.

You can narrow down the search by checking the if the carbs are designed for single cable or dual push pull cables. Also measure the internal bore, (36, 38mm?) and the spacing.

My guess (and just a guess) would be water cooled 750 (pre SRAD).  

Good point dint spot the extended idle screw...............

thought blandits were 36mm

 

[Captain Chaos]

2 minutes ago, Duckndive said:

thought blandits were 36mm

they are. 38's were only mounted on 750's, 1100's have 36's or 40's.

[Nelson]

Thanks Captain

They have a 140 main jet & the power  jet is blank or is a blocked off jet.

So it seems like they might be off a Uk 750 M.

So here's the original emulsion tube.

.

Its got 2 X 3 drillings & 2 X 2 drillings.

Here's the new one from Robinsons.

 

It is the same size, however, no drillings & the hole for the needle is way smaller.

I've only ever seen them with holes drilled in the sides, never blank.

Anybody had experience or remembers what the emulsion tubes look like.

 

[Captain Chaos]

I have a set of 38's from a 750M (for parts), the code on the carbs is 17D30, and AFAIK the emulsion tubes are still original, with 1 X 1 and 3 X 2 holes. Code on the tubes is 64B and 0-B (I think, eyesight is slightly affected by beer consumption). Hole for the needle is the smaller one like on your new tubes.

[Captain Chaos]

and I see here that the part no. of your new tubes is replaced by 09494-00675 (part 27).

[Nelson]

Thanks for the info & web site Chaos

Looking at the MSP site, the 750 M 1991 emulsion tube is 0724, jet needle 0 - 8

Looking at the emulsion tubes that came with the carbs, they seem to have the identification markings:

631, then some kind of symbol, then, 0 - 8

Not 100% because eyesight affected by being an old git.

I've cleaned the original tube, but no markings at all.

So, you think I need part No 0675 & Robinsons might have used the old part No. 0724.

Here's the original needle, the original emulsion tube & the new emulsion tube.

I measured the needle, it's near as 2.98 / 3.00 at the top & 2.58 / 2.6 at the very tip.

[Nelson]

Just to make life more interesting, I've found this part No. 0677 at this site.

http://www.cmsnl.com/

 

[Captain Chaos]

first find out what carbs you have exactly. On the left side of the left carb body there should be a code, 17D30 for example.

With that code and the factory service manual (which I have here) we can find out what emulsion tubes and jets etc should be ordered.

[Nelson]

Mr Chaos,

That sir, would be MOST EXCELLENT.

Now, this number, I've had a look & its not immediately obvious, it's probably me being numb (not for the first time), however, where bouts is it ?

Many thanks for the offer.

 

[matt]

The last couple of sets of emulsion tubes I've had didn't have the holes drilled along the tube.

That needle looks a bit odd, shouldnt it be tapered?

Also the original emulsion tube in the centre of your photo, has it still got he main jet screwed into the end of it?

[Nelson]

Hold on, wait a minute, they do have a number......

It's real faint, they don't make it easy.

The start of the number is faintest so, it looks like a line sloping back, a 1 or maybe a 7,big maybe.

Then fairly sure it's a D, then 42.

Hi Matt, welcome.

All the tubes I've seen, have all all been the same: two pairs of two sets of holes.

Also the hole for the needle is only about 1/3 the size of the original tube.

The needle tapers from about 3.00mm to 2.6mm, it tapers all the way but has three distinct bits.

Your right, odd.

The tube in the middle has the cap & main jet screwed in, so I don't loose them.  

 

[Oilyspanner]

It looks like a jet kit - D or DJ then a number or two is Dynojet - Original Mikuni parts don't work with their stuff, it has to be one or the other. I've seen the oddly tapered needle before somewhere on the net. Best check all the jets for make and sizes.

[Nelson]

Cheers Oily, thoughs numbers are from the side of the carb body. 

[Oilyspanner]

Mikuni mark their jets and have their Japanese character, the small square inside a square, stamped on most of them - Dynojet normally have dj on them. If the carb spacing is the same as your old carbs, the 38s have to be from 750 L or M - I can't remember if there is a lightly stamped number on the outside of the carb body on yours, if there is it will be as Cptn says.

To get the most from your carbs, you'll need to match the diameters of the carb throat and inlet port - a 2mm ridge all the way round will cause a lot of turbulence and damage flow.

[Captain Chaos]

so the carbs' code is 17D42. I'll have a look in the service manual this evening and then I'll be able to tell you more.

[Nelson]

Hi Chaos

Thanks for the reply, the number on the carb body is:

1 or 7, then D42. 

Oily, thanks again, the carb body no. is as above. 

Got a bit confused further up, the old original tube has no identification no. 

The new ones are 631, the square in a square (now you have told I can see it) then 0 - 8

The spacing is spot on & I'm running 40s at the moment 

Thanks fellas

[Captain Chaos]

just had a look in the service manual and 1 or 7 then D42 is not listed. Sorry dude

I'll have a look in another manual (Clymer) tomorrow at work.

[Nelson]

Bottom !

Cheers for trying Captain, much appreciated. Hope Clymer come up trumps.

 

Spoke to Robinson's today, they had re-ordered the emulsion tubes & had a look.

They also didn't like of them & thought the tubes looked 'odd'.

They're going to give the big dudes at Suzuki a turn, I'll post the results.

 

Watch this space

 

[Captain Chaos]

Clymer does not mention 17D42 either. You'll have to wait for Suzukis answer.