Yamaha FJ1200 1991 - Boost Sensor

[Speedy Gramps]

a lot of spit back from carbs ,, got that almost fixed .

? ? ?  question  the vacuum line on the #2  carb goes to some type of  mechanical  timing advance  ,, if I  pull the line off  the  carb  side and  SUCK  on the line  ?  should  I be able to suck  air through the  tube  ?  or would /  should it be plugged  and  NO  AIR  is pulled through the  tube ??

I have owned it from day 1   1991  and it does have a vacuum advance under the faring ,,,, I just  do not know  if it is working  correctly  .

Thanks Speedy Gramps

[FJmonkey]

It should seem plugged. It help flash off fuel when you chop the throttle to meet emissions standards. No performance gain with it.