4. SECOND STAGE DIAPHRAGM

Function

The second stage diaphragm operates the second stage throttle depending upon throttle position and engine load.

Problems

If the second stage diaphragm is not operating properly the following may be experienced:

1. Poor acceleration.

2. Inability to reach full speed.

Inspection

1. Locate the two vacuum supply holes for the second stage diaphragm housing. (See Fig. 1 )

2. While the plate block section is removed, lift the second stage diaphragm and place fingers over the vacuum holes in the venturi. (See Fig. 2.)

3. Release the diaphragm. Vacuum will hold the diaphragm if there are no leaks.

4. If the diaphragm is bad, only it needs replacing. (See Fig. 3)

5. Reassemble carburetor using all new gaskets. (See Fig. 4)