Vacuum secondaries spring

[patrickt]

Originally Posted by FredG

The adjustable was going to be my next option after I see how much of a change the spring made. What did you use as the determining point for the opening. Best info I could find was right before the engine bogged when you punch it.

Fred

Yep, you open it up so the secondaries "flop" open, and cause a bog, and then you close off the screw a bit, test it out, close it off some more, test it out, close it off some more, test it out, the bog is now gone, so, open it up, test it out, either leave it where it is or ease it back a hair and you're done. Now, if you change your air cleaner to a low restriction type, you must change your setting or you will lose power noticeably.