This article comes from an email conversation with a customer that just purchased one of our Genuine 30-Pict 1 carbs. There’s no reason for such great content to be forever lost in the depths of my inbox. So.. Let’s talk about how to properly install one. Words by the amazing, Jay Salser.
Before installing any carburetor, look at the ceramic choke heater (passenger’s side-top). There are 3 screws securing the choke ring–which keeps the choke element in its intended position. Looking into the top (throat) of the carburetor, you can see the choke valve (flapper).
Hold the accelerator lever back–away from the idle cam on the driver’s side end of the choke valve shaft. Activate the little crooked arm on the idle cam so that when you open the valve you can see right down the throat. Turn the little arm loose to see where the choke valve will come to rest. This flapper valve wants to be set to close very loosely! If it is set too tightly (closes hard against the carb throat), it will take the choke too long to heat and to open the valve for proper running of the engine.
Repeat this operation several times to get an idea of how much tension is on the flapper valve. If it is closing too tightly, do the following.
Slightly loosen the 3 screws on the ceramic choke element retaining ring. Move the ceramic choke heater slightly clock-wise–to loosen the tension. Turn counter clock-wise to increase the tension. Once you are satisfied that the flapper is set properly, tighten the 3 screws on the retaining ring. DO NOT OVER-TIGHTEN! These threads will strip easily. Just tighten firmly.
Hopefully the gasket between the carburetor base and the manifold flange comes with the carburetor.
When you bolt on the carburetor…..you want to snug the carb to the manifold flange but don’t try to wrench it with all of your might. The gasket will be squeezed when you firmly tighten the nuts equally. This forms the air-tight seal which is required.
Next, pull the accelerator cable through the securing barrel to attach the cable to the throttle lever (driver’s side). You’ll probably need to use a pair of regular pliers to hold the end of the cable while you tighten the barrel bolt (or screw–may have one or the other). Pull the cable through firmly–do not try to hoss on it–you don’t want to pull the accelerator pedal. But, you don’t want to leave it hanging slack, either.