With kind permission of Scottsta22.
Mild 2T-G with mild cams and over-size pistons.
Shows how stock jetted 40mm Solexes could be at their limit. A change to the next size up Outer Venturi, removal of the Internal Sleeve and a couple of sizes up on the Main Air Jet and 100hp will be there for the taking.
That dip is most likely a combination of lengths of intake and exhaust tracts, and valve timing. It's that "resonance" thing lots of people talk about and it would move in the rev range as jetting is changed.
Regards
Rodger
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