Bultaco 370 Mikuni Flat Slide jetting

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Aug 10, 2007
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#1
Hi,
I have a bultaco 1977 370 pursang,i have just rebuilt the engine and is now 390cc.Can anyone give me some info on jet sizes for a Mikuni 38mm flat slide carb with a power jet to suit this engine or at least a starting point?
any info would be helpful...

Regs