GS1000S Mikuni VM carbs

[Jonnyg]

Good afternoon I'm currently working on a 1978 GS1000s trying to set the carbs up, but im struggling to get them to balance up. I have a low vaccuum reading on Cylinder 3. As i lower the slide on number 3 to raise the Vac it is forced on the venturi floor which then lifts all the other slides causing engine to race. I have replaced the inlet rubbers,O,rings and clamp rings to remove air leaks, checked valve clearances all within spec. compression cold is 150 psi for all 4 cylinders. loosing my already thinning hair know any help appreciated Thanks John 

[Jonnyg]

Sorted it operator error there are three breathers off the back of the carbs as I thought,  No No No the pipe off No3 is a Vac pipe hence the low reading What a Fecking Idiot  

[TonyGee]

1 hour ago, Jonnyg said:

Sorted it operator error there are three breathers off the back of the carbs as I thought,  No No No the pipe off No3 is a Vac pipe hence the low reading What a Fecking Idiot  

Doh !!!!  

[Jonnyg]

1 minute ago, TonyGee said:

Doh !!!!  

Got a 550 to do as well and I know know why that one wouldn't balance up too 

[Poldark]

Don't feel too bad.  One time, I did similar, but the opposite.  Hooked up the vacuum port to the vacuum actuated fuel petcock, then capped off the other two "vacuum" ports.  After I figured out that they weren't vacuum ports, but carb vents, it ran so much better.