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Question on Mikuni 29 rebuild

  • Thread starter Thread starter burningdead
  • Start date Start date
B

burningdead

Guest
Hi all. I recently purchased a 1979 GS1000 :-D and rebuilt the carbs. I'm new to the site and have a question regarding my Mikuni 29s.

In addition to the fuel tubes, ports on carbs #1 & #2 and #3 & #4 are connected via an additional short piece of tube. When I reassembled everything I couldn't find the short section of hose that ran from carb #2 to carb #3 (I figured it had been accidentally thrown away), so I cut a piece of fuel line and placed it between these two carbs.

When I attempted to attach the throttle spring I found that the spring and the tube wanted to occupy the same space. I referred to some pictures I had taken prior to disassembly and saw that #2 and #3 were connected only by the fuel tube and the ports above the fuel tube were uncovered.

My question: Do these ports need to be capped/plugged, connected to each other, or left alone?

carbs1.JPG



Any help would be greatly appreciated.

Thanks,
Chris
 
I don't have 29's but the 22 VM's on my '79 550 do not connect the ports you are pointing at. I think the ports in question are not drilled through - try poking a piece of wire in the port to see if they are drilled through.

Not sure this helps but a photo of my 550 carbs is below. Note - throttle linkage is in a different place.

Picture017.jpg
 
Thanks for the quick response.

Nessism said:
I think the ports in question are not drilled through - try poking a piece of wire in the port to see if they are drilled through.
Click to expand...

Using a long piece of fuel line I was able to blow air through each port with the throttle open. I can't say at what position the ports opened.

Thanks,
Chris
 
burningdead said:
Thanks for the quick response.



Using a long piece of fuel line I was able to blow air through each port with the throttle open. I can't say at what position the ports opened.

Thanks,
Chris
Click to expand...

Hey Chris,

Those ports are float bowl vents. Opening the throttle shouldn't make any difference.
 
Nessism,

Thanks for your assistance. I don't know what I was smoking yesterday. I just stuck stuck a piece of fuel line on each port and was unable to draw air through either. Feeling slightly retarded. Question resolved. Ports are plugged.

- Chris
 
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