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Here's the high-speed needle; it affects the operating temperature of your engine. A good temp range is between 220 and 230 degrees F.
The low-speed needle doesn't have to be adjusted as often as the high-speed needle. Sometimes, it might not need to be touched at all. When you set the low-speed needle, pinch the fuel line and listen to the engine; the rpm should slowly rise and then fall.
Rich Lean
Here you can get a good look at all the needles on this carb. The high-speed needle is on the top right, the low-speed needle is in the middle of the arm and the idle screw is on the front.
