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Old 03-02-2006, 07:06 AM
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If you look at the throttle blades from the bottom the transfer slot will make a perfect square. If you have too much transfer slot it will idle rich.

The transfer slot delivers fuel as the carb transitions from the idle circuit to the main circuit.

Some carbs have a stop on the secondaries that can be altered to crack them open to allow a little more air. This is better than drilling the throttle valves.
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