What carb do I have?

[scrambler]

After rebuilding the petcock today, I'm taking a close look at the carbs. I'm guessing they are add on since there is a choke and cable on the handlebar, that is not connected to the carbs. there is a choke lever on the left side. Mic is on the left side of the carb, and Mikuni Kogyo is on the right. when looking down at the carbs from the riding position, there is a small nipple on the 2nd carb from the left, a large nipple ( where the gas line is now ) in the center, and another small nipple on the 4th carb from the left. which line do I connect to the diaphram side of the petcock?
Scrambler.

[Spyderman]

need pictures so we can give you an identification if the type of carbs you have

[Steve]

Would also help to know what bike you have, so intelligent suggestions can be made.

.

[scrambler]

yeah, sorry, 79 gs 1000e. I'll see if I can get some pics up.

[scrambler]

Only lets me do one at a time, here they are.

[scrambler]

No 2 of the file

[scrambler]

3 of 4 of the file

[scrambler]

4 of 4 of file
click on the thumbnail for a really large photo.

[Nessism]

A little hard to tell but those look like VM29's. Worth a pretty penny unless I'm seeing things. If the drain plug looks like these those are VM29's.

Oh, and I don't think these carbs have a vacuum line nipple. The two outer hoses are vent lines.

[scrambler]

Thanks Nessism, I looked underneath and they do have that drain plug.
so, how do I get my newly rebuilt petcock to work with these carbs?
Scrambler.

[7981GS]

???

Yours...


Look an awful lot like these:



Daniel

[Nessism]

Thanks Nessism, I looked underneath and they do have that drain plug.
so, how do I get my newly rebuilt petcock to work with these carbs?
Scrambler.

How about buying a thread in vacuum port nipple, similar to those used for performing a sync job? Screw it into one of the threaded sync ports in the cylinder head.

[KEITH KRAUSE]

Thanks Nessism, I looked underneath and they do have that drain plug.
so, how do I get my newly rebuilt petcock to work with these carbs?
Scrambler.

If you have 29's then you'd need to set the petcock to prime position. Turn it off when parked.

[scrambler]

Thats the way it was set up when I bought it.
it would only give the carbs gas on the prime side. set it in the main side and it would starve at least two of them. and of course leak gas into the engine. will it make a difference since I have rebuilt the petock?

[KEITH KRAUSE]

Thats the way it was set up when I bought it.
it would only give the carbs gas on the prime side. set it in the main side and it would starve at least two of them. and of course leak gas into the engine. will it make a difference since I have rebuilt the petock?

If you have a vacuum petcock, then without vacuum, it will only pass fuel in prime position.