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A simple displacement change will not force as big a change in jetting as you might think. Opening the exhaust and removing the air box will force greater jetting changes. Bear in mind that Yamaha used no fewer than 5 different variants of the BS38 on different models of the XS650 in North America alone. I do not know what differences if any were present on European models, but a starting place would be here: www.amckayltd.com/carbguide.pdf.