Attached is the Tuning manual for your Mikuni VM Carburetors
see second post below
see second post below
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2 & 1/4 as sir admin said if you're on low elevation. 2&1/2 usually for mountainous place.how to tune the air and fuel mixture accurately? i already followed that 2 and 1/2 but it seems like too much air is coming into the carb. what is the technique thnx