De Paris

Good morning all I have not found the BS 38 configuration for a 750 kit. thank you Here the terraces of Cafés are open
 
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.
 
I'm using the 1201 with good results on our XS - the 801 would work, but @ 11AH equivalent could be marginal.

PS - I also use Shorai LFX14L2-BS12 (14AH equivalent) with good results on our XS
 
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