Needle jet/ emulsion tube

[BA80]

This is the first time I've run into this. It seems I read something about it a long time ago but I can't find it now.

On the set of SF carbs I'm going through right now there are 2 different needle jets, both are X-2 but one set has 4-4-4-4 bleed holes and the other has 3-2-3-2 bleed holes. There are 2 of each.

All the others I've done were the 4-4-4-4. Is this right and where do they go back in. I didn't see when I took them out because they were covered in green stuff.

[MPittma100]

Emulsion tubes

The ones I have been into also have the 4-4-4-4 tubes. I think Yamaha did this on the 1978E, 1979F, and 1979SF. Don't believe they went to the combination until 1980 and 1981. They then put the tubes with more holes (richer) in the two center carbs.

[BA80]

I was thinking the richer running set would go to the 2&3 carbs for cooling purposes. However, since those are air bleed holes wouldn't the ones with FEWER holes be the richer running ones?

[red bandit]

I've seen this in several SF's. Less air holes is richer, the inside two (2&3). The ones with 4-4-4-4 were in the E & F. From what I've seen anyway.

[BA80]

Thanks y'all. That's what I was thinking but I wanted a second opinion.

[bikerphil]

Yes, less holes = richer and go in carbs 2 + 3. Air runs thru those holes, not fuel.

[natemoen]

I have a set of carb's that I believe are from an sf that I have been going through. They also are all x-2 tubes but there is also a number under them. 2 of them are a 300 something number and the other 2 are a 200 something number (don't remember the exact number).

[3Phase]

I have a set of carb's that I believe are from an sf that I have been going through. They also are all x-2 tubes but there is also a number under them. 2 of them are a 300 something number and the other 2 are a 200 something number (don't remember the exact number).

From carburetors.com:

Series 266 Size X2 Type P
Holes from bottom 4,4,4,4
Application BS34 1979 XS1100SF Carb #2 & #3
Yamaha Part# 3H3-14941-02 

Series 300 Size X2 Type P
Holes from bottom 0,0,4,2
Application BS34III 1980/81/82 XJ/XS 1100
Yamaha Part# 3H5-14941-02

Series 301 Size X2 Type P
Holes from bottom 4,4,0,2
Application BS34 1978/79 XS1100E/F All and 1979 XS1100SF Carb #1 & #4
Yamaha Part# 2H7-14941-02

In case the list gets mangled here's the post:-
Help Find A Cure for Crazcnuk's bike? View Single Post

[mack]

Scott

I remember three years ago someone posted that chart and it was determined to be in error. Less holes go in the 2 &3 carbs.

[BA80]

Hmmmmmm........... Is the chart wrong? It certainly seems to be.

I have the 266's and 301's.

[3Phase]

Boo me!

I remember three years ago someone posted that chart and it was determined to be in error. Less holes go in the 2 &3 carbs.

Looking at it again this morning I think you're right and I'm wrong wrong too -- fewer holes go in #2 and #3 carburetors.

Are the part numbers and hole counts correct and they're just listed for the wrong carburetor location? We can't actually buy them any more so it's probably a moot point unless someone finds new ones in a back room somewhere.

I can't edit the stupid thing now, the original thread has been enshrined forever in archival concrete and carburetors.com has gone the way of the Dodo.

.

[mack]

Scott

I've been tearing out floors all day so I'm pretty bagged but if I remember correctly, the original chart from mikuni was correct but the transfer of data using a different program lead to the error. But the bottom line is that it was caught quickly at the time by one of the long standing members. maybe Ken talbot, I'm not sure. I'm too tired to head out to the shop to check. In fact I'm skipping supper and just heading to a bath and bed. The hole count is also wrong, it's 4-3-4-3 not 4-4-0-2 for the 301's

[BA80]

I've been tearing out floors all day so I'm pretty bagged but if I remember correctly, the original chart from mikuni was correct but the transfer of data using a different program lead to the error. But the bottom line is that it was caught quickly at the time by one of the long standing members. maybe Ken talbot, I'm not sure. I'm too tired to head out to the shop to check. In fact I'm skipping supper and just heading to a bath and bed. The hole count is also wrong, it's 4-3-4-3 not 4-4-0-2 for the 301's

Sorry mack but I'm sitting here looking at them and it's 3-2-3-2. Send you a pic if you like.

Doesn't really matter though, they need to go in the center. that's what I was looking for.

[mack]

Greg

Told you I was tired. Back at it today. Knees aren't what they used to be. Man I'll be glad when this renovation is done.