jet sizing with a sidecar

BSA750four

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croydon surrey uk
I have a 1982 cb750k2 engine with Keihin VB52A inline carburettors. The standard size main jet is 102, mine has 98's installed. The previous owner has four DNA airpods fitted. Above 3500 rpm, when the main jet cuts in, the bike pops and bangs and stutters. I think the jetting is too lean.
Wondering if anyone has a side car and or has added air pods and experience with the jet sizing. Help would be appreciated to avoid the days of trial and error ahead.
 

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