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TROUBLESHOOTING GUIDE - Holley

TROUBLESHOOTING GUIDE - Holley

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Engine blows out black exhaust smoke. The fuel mixture is too rich. Reduce the jetting size (use caution to be sure not to go lean) or increase the power valve to a higher factor to prevent it from opening too soon. Look for leaking needle and seat in carb and excessive fuel pressure. Engine runs too rich and spark plugs are black and sooty.

  Smoke, Holley

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