Hello everyone, my problem is with carb #4 on my GL 1200 Interstate. This carb will not sync out of the four, and it appears to not show enough vacuum for the sync gage to work, the needle does not move at all. The little tube going out from the carb to the slow air valve appears to be all plugged up. I've tried putting a thin wire into it but it only goes in so far. I've tried carb cleaner and it just spits it back out in my face. I've tried blowing it out with 100psi air pressure, and ziltch, nada, nothing clears it out. The elbow tube appears to be put in by pressure but it will not budge. Any input from savy members will be greatly appreciated.