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Lifan 125 Jetting Please Help

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I am trying to help a friend with a newly acquired Lifan 125 engine. He is having a severe bog when twisting the throttle hard. He is using a Mikuni VM22 carb from unknown origins. Can anyone recommend a jetting or needle spec for this setup.

Thanks.

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my Lifan 150cc was suplied with ShengWey carb (similar to Keihin) with #98 mainjet. Spec sheet calls this a "PZ-27", but carb body stamped "PD16." (it includes an accelerator pump which I disabled). Ran too lean as jetted, but runs well with #110 mainjet. Mikuni jets are sized differently -- I tried a 26mm Mikuni, but it ran poorly. Sometimes California imports are setup too lean (To meet pollution specs?) Bogging at highspeed eliminated with richer mixture...

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