Pic 2 shows the tubes from the balancer plugged into spigots screwed into the carbs.
Pic 3 shows the balancer 'gauge' itself. The upper ball bearing is static, the lower one is actually oscillating from side to side by about 3/16" with the vacuum pulses of the motor. Correct sync happens when the lower ball is centred underneath the upper ball, as it is pretty much here.
If the lower ball is not underneath the upper one then the screw and locknut on the top of the carb being worked on is used for adjustment. The locknut is loosened and the screw turned, which will move the lower ball left or right. When it sits under the upper one you're in sync.
Carb #1 is then complete, and the balancer is then plugged into carbs #3 and #4 and the process repeated.
Total time, including taking the tank off: less than 1/2 an hour.
