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What carb do I have?

  • Thread starter Thread starter scrambler
  • Start date Start date
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scrambler

Guest
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.
 
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need pictures so we can give you an identification if the type of carbs you have
 
yeah, sorry, 79 gs 1000e. I'll see if I can get some pics up.
 
4 of 4 of file
click on the thumbnail for a really large photo.
 
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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.


IMG_0740.jpg


IMG_0743.jpg
 
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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.
 
scrambler said:
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.
Click to expand...

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.
 
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scrambler said:
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.
Click to expand...
If you have 29's then you'd need to set the petcock to prime position. Turn it off when parked.
 
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?
 
scrambler said:
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?
Click to expand...
If you have a vacuum petcock, then without vacuum, it will only pass fuel in prime position.
 
So Keith, when you say turn it off when parked, do you mean set it on the on position?
 
scrambler said:
So Keith, when you say turn it off when parked, do you mean set it on the on position?
Click to expand...
To avoid the possibility of fuel passing through when the motor is off you need to move the lever to off position. If the petcock is operating as designed then the on position would also not allow fuel to pass in the absence of vacuum.
But I would use off position. No chance of fuel passing through even if the petcock diaphragm fails to seal (in your case/running non-vacuum carbs).
 
There is not an off position on this petcock.
it has On, Reserve and Prime. so in this case, on should serve as an off position, once I seal up the vacuum side, correct?
Scrambler.
 
scrambler said:
There is not an off position on this petcock.
it has On, Reserve and Prime. so in this case, on should serve as an off position, once I seal up the vacuum side, correct?
Scrambler.
Click to expand...

True that! No off position. Keith has been drinking Kawasaki koolaid so long he forgot.:-\\\
 
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