![]() There's no needle valve (idle mixture screw) on the secondary side. The hole itself is the idle port restriction. Now off the top of my head, I sure don't remember what size that bit is! That's why notes are so important.īelow is the secondary side of the same carb.Ī very small drill bit is sticking out of the secondary idle port. The small squareish cavity by the end of the bit is the transfer slot. The big hole above the bit is the idle discharge port. If someone needs a picture, here's the amount a primary throttle slot is visible compared to a drill bit shank. ![]() Figured after its running, kendog can then readjust the primary thottle position to be between. I'm assuming its high likelyhood that when the engine is first started, someone may crank the idle speed screw in to keep it running. ![]() I'm trying to keep to initial basics and small steps.
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