Originally Posted by Portholme
Sorry. Didn't make myself clear. We have a carb balancer but I'm not sure of what the settings should be. Do we need to adjust to a set number across all four or pick one of the carbs and balance the others to that number. If it's a set number, where do I get those set up numbers from??
The lower carb has no adjustment screw and you syncronize the remaining 3 carbs to the specs of the lower one . This one is the reference for all other carbs .
Instead of using the standard "vibrating" 4x balance gauges you can take a few meters of transparent hoses which you nail as a loop on a 2m wooden plank . Then you fill them partially with oil - red ATF for instance and put the plank upright next to the engine .
One open end you connect to the lower carb , the second open end to the carb above . Then start the motor in low idle .
Due to vacuum differences between 1st and 2nd carb the oil level in one hose will go up while the other side goes down . The trick is to turn the sync screw in a way that the oil level on both sides is on THE SAME LEVEL = means in both carbs is EXACTLY the same vacuum .
This way you can syncronize then also the 3rd + 4th carb with the lower reference carb .
Have just done this to my F100 and it runs great .
Tomorrow I could post some pictures if some´body is interested ..
Regards - Jürgen