Jetting for Mikuni VM18

Brian H /
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Hey quick question. My stock carb on my 1978 Honda express just isn’t working well after cleaning and tuning. My question is if I put a Mikuni vm 18 will work with the stock cylinder. Also what jets would work for stock. Doing research people have said 110-120 range but that is with an upgraded 70cc kit. It has to be lower for stock right?

Thanks!

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