Yeah, pretty much the same for the MC21 and can also be applied to the MC18's and MC16.
The Later MC21 carbs have a "dimple" on the slide that can be used to visually align them, and all the other carbs can be visually aligned by the little crescent cut-outs at the bottom of the slide as they lift up and "touch" the top edge of the carb body.
Fine adjustment is then done with the air screws based on the venturi pressure measured with a vacuum gauge.
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Andy.
NSR-WORLD.COM
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