It sounds like he is giving you the right information. You need a needle and seat for a 38 mm Mikuni VM carb. I would go with a 1.5 size being you have a fuel pump. The 2.0 has a larger inlet hole but it is harder for the needle to shut off if there is to much fuel pressure. The viton tip means that it is a rubber style tip that is not affected by gasoline.
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