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Idle Jet Problem on 9Super7 So, I got a new replacement 9Super7 carb from Speedway, at no added cost to me. Now the accelerator pump works. Hurray.
But now the left idle circuit is not working. The right jet will slow the idle speed if I close it down, and gets a little rough if I open it too far. However, the left idle jet has no effect on engine idle at all, from closed tight to three turns out. With a triple carb set up, I must try every possible solution before removing the center carb base, just because I do not want to mess with the progressive linkage set up, unless I have to. What is the best way to clear that blocked idle circuit? The two secondary carbs have no idle circuits, which simplifies idle adjustment, but depends on having both secondaries throttle plates completely and exactly closed at the same time. Otherwise, it is like trying to get a smooth idle with a big vacuum leak. Easier said than done! Thanks. |
Re: Idle Jet Problem on 9Super7 Remove the idle jet, main jet and emulsion tube in the offending side. Use a 7/64" drill bit as a measuring device and pass it through the idle jet passage to visually inspect if it's been drilled all the way through. I have seen them not drilled all the way... China quality control is sometimes iffy.
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Re: Idle Jet Problem on 9Super7 Pulled the carb all apart and verified that the idle jet passages are all clear. Replaced the adjustable main jets with .045 and adjusted the linkage between secondaries so that both are tight closed at idle. Now it idles and runs like a champ.
Yep, against all advice I tried the adjustable jets, because I thought it might be easier to get to the right mixture on the 3x2 setup. Nope, it just doesn't work. I thought I was opening the adjustable jets exactly the same amount, but I ended up with the main jet on the side with the supposedly bad idle jet way too rich. This time it was pilot error, not Chinese quality control. |
Re: Idle Jet Problem on 9Super7 Good info... Did not realize you were using adjustable jets.
Glad you got it sorted. |
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