Which way is up for the butterflies?

[audiocontr]

I see one side has a small pin hole off to the side of the central axis. Which way does this face? Up / down? Towards the choke or away?

[TechMOGogy]

This may be helpful?

[audiocontr]

Thank you, but nope. Doesn't help. I assumed they were balanced but it appears its not the fact. This diagram doesn't indicate which way is up (there is a pin hole on one side)

[McCall Pinz]

As I recall, the edges of the butterflies are angled so they seal before being completely flat. It's hard to explain, but imagine a shallow sloped roof with fascia(edge) vertical. If its flipped over it won't seal right.

I have some pictures here, but I cat see the holes...
https://plus.google.com/photos/11596512 ... k9mTtYSHZA

Maybe in this one?
http://www.goatwerks.com/images/Carb%20 ... rb26lg.JPG

[audiocontr]

On the right track.

In my best Scotty voice - "Damn it Jim, I'm a sales guy not a pinzgauer mechanic."

This is a specific one that I'm afraid only Jim can answer.

[Jim LaGuardia]

Depends on the base type. MK1 and MK2 bases have large external screw and the dot is on top facing the idle screw ports.
MK3 small idle screw have a machined area that faces up towards the idle screw ports, dot on bottom facing away from idle ports.

[audiocontr]

Fantastic! Thanks Jim!