Another carb related issue that I have encountered is a bad diaphragm on the secondaries. When that happens, you get little or no opening of the secondaries, which as you might expect, seriously reduces the power level. You can check that the secondaries are opening fully when you run on the dyno. Or you can find a major leak by taking off the vacuum chamber and sucking on it to see if the rod that actuates the secondaries goes in as it is supposed to. BTW, don't try any of the suggestions that you make the secondaries operate mechanically. That's one thing that has been specifically deemed verboten, and SEDiv tech inspectors occasionally do check secondary operation in impound for IT7s.
Last edited:
