When the secondary throttle plate is horizontal check that the bottem edge of primary slide is flush with the top of the carb bore. I belive this is what the manual is refering to. I ussually set the carbs at 5mm, As yamaha changed the spec in 85, I find it helps with the 3500rpm stumble that is common problem for the bike.
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Winston
85 xt600Z
02 YZ250
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