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This may be stating the obviouse, but I suspect that until the aero is improved you will hit a limit on sprocket changes improving fuel economy.
I have a Yamaha WR250 that I have a 14T front sprocket for, but have not instaled because the bike can not maintain a reasonable highway speed [100km/h, 60mph] in 6th gear in head winds. So until I can make some aero improvements the 14T sprocket will sit on the shelf.
Keep up the good work, when do you expect to be installing your "Vetter" tail end?
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