Picture above is not my bike, but mine looks basically the same.
1988 CBR 250R. 4 cylinder 250cc, 18000+ rpm.Currently in process of mild restoration: New fairings, new paint on rims. One of less than ten in America.
EPA combined rating set to average of MC19s and MC22s on fuelly
ODO and speedo may be off and inflating mileage numbers, but have not confirmed yet.
Planning a frontal area and coastdown test to determine Cd and CdA.
Drivetrain: Non O-ring chain, Aftermarket muffler (bringing down mileage), 90 main jet (stock is 85), 1 5/8 turns out for pilot jet(stock setting instead of richer), 38 PSI front, 41 PSI rear, all four spark plugs indexed to intake valves
Aero: Front radiator ducting and partial rear ducting, Foam blocks to cover front "air intakes", rear fender, belly pan to cover exhaust and deflect air from rear tire, fork air deflectors
Drivetrain: Taller gearing, adjust idle speed from 1500 rpm to 1200 when engine is warm, extra brake drag reduction clips
Electrical: Clean up grounding points, lighter battery
Riding style: Limit screaming to when it will be productive