Which Emulsion Tube?

[MPittma100]

As I tear down a set of 1979SF carbs, I find two emulsion tubes with 4 sets of 4 holes and the other two have alternate hole sets of 3 and 2.

Are these the correct tubes? If so, which locations are they supposed to be. When coming apart, the two 4 hole tubes were on cyls. 3 & 4. The 3-2 hole tubes were on cyls. 1 & 2. Does not seem right.

Thanks, MP

[motoman]

As I tear down a set of 1979SF carbs, I find two emulsion tubes with 4 sets of 4 holes and the other two have alternate hole sets of 3 and 2.

Are these the correct tubes? If so, which locations are they supposed to be. When coming apart, the two 4 hole tubes were on cyls. 3 & 4. The 3-2 hole tubes were on cyls. 1 & 2. Does not seem right.

Thanks, MP

If there correct, two for center two cyl. and other two for outer two cyl. Which is where?.......havent a clue associated with the early carbs.

[bikerphil]

The holes are air bleed holes, the tubes with the least holes (richer) go in carbs 2 and 3 to provide a slightly richer mixture for better cooling on the two center cylinders.

[MPittma100]

Good to Know

The holes are air bleed holes, the tubes with the least holes (richer) go in carbs 2 and 3 to provide a slightly richer mixture for better cooling on the two center cylinders.

Thanks Motoman and Phil. They were not in the correct place but they will be.

Mike

[skids]

Phil hit the nail on the head.

[MPittma100]

Nail

Phil hit the nail on the head.

As usual. We like it that way. That information is not in the book.

MP

[bikerphil]

Pretty sure that Standard carbs (early style) have the same 4 tubes across, only the Special had the mix. BTW, the mains were always the same size across on the board on all early type carbs.