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Thread: Carb and Timing Tuning

  1. #11
    robertm
    i think youre going to find that 32 degrees of total timing is not enough. but like he said just run it on the gps and keeping stepping up the timing. i have mine set at 38 degrees of total advance.

  2. #12
    Lavey Huffer
    I learned to set the idle screws with a tach.
    tap the acc. pump very lightly with your finger
    and re-adjust until there is'nt a drop in the idle
    bog= too rich
    rev=to lean
    try to find a happy medium
    idle circuit is very important it dictates how the carb will run until WOT

  3. #13
    HP350SC
    Thats what im after. Im about to order a LM-1 a/f meter.
    A/F meter is the way to go for jetting. Plan to spend a few hours on the water, hopefully your bowls are easy to remove. Bring a good selection of jets covering a broad range. I cut a qt. oil bottle in half, then pull the lower rear bowl screw first, to drain it each time.
    Regarding target A/F mixtures...
    Mild cammed motor will idle near stoich 14.7, big cammed 13.0- 13.5.
    Assuming you are not knock limited, for mean best torque aim for 12.5 AFR, midway between lean and rich best torque (12.2:1-12.8:1)
    On boosted motors that are knock limited, 12.2 if not rich best torque of 11.76 will increase flame speed at very high rpm, with side benefit of surplus fuel to cool combustion.

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