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Owner: Daschicken
Cibbie: 1988 Honda CBR 250R
Displacement: 0.249 L
Fuel type: gasoline
Transmission: manual
Curb weight: 355 lbs
Coefficient of drag: 0
Frontal area: 0 sq.ft.
Description: 1988 CBR 250R. 4 cylinder 250cc, 17000+ rpm.Currently in process of mild restoration: New fairings, new paint on rims. One of very few in America.

Current gearing 17/51
Stock gearing: 17/54
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.

I am aiming for a lifetime mpg of around 65, I want to beat(match...) those single cylinder 250s!
Build Thread: Cibbie-1988 CBR 250R
Current Mods: Aero: None

Drivetrain: 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, 51T rear sprocket (54T stock), carbs synced

Electrical: None

Planned Mods: Aero: Reinstall aero front fender when it gets back from painting, front radiator ducting and partial rear ducting, Foam blocks to cover front "air intakes", rear fender from mc14/mc17, belly pan to cover exhaust and deflect air from rear tire

Drivetrain: Adjust idle speed from 1500 rpm to 1200 when engine is warm, extra brake drag reduction clips(or some to begin with...), re-sync carbs with a manometer, 0W40 Mobil 1 FS Euro formula oil, make a set of headers that aren't bigger than a LITER BIKE'S!

Electrical: Clean up grounding points, lighter battery, dank white LED underglow, ecliptech LED taillights

Riding style: Limit screaming to when it will be productive

Misc mods: Aluminum subframe, drill out less important bolts for weight reduction, bro,
Official Fuel Economy Ratings
EPA city 0 mpg(US)
EPA highway 0 mpg(US)
EPA combined 49.7 mpg(US)

Actual Fuel Economy Performance
Lifetime 52.21 mpg(US)
Last 3 tanks 52.56 mpg(US)
90 days 48.49 mpg(US)
View Fuel Log
Last updated: Nov 13, 2022

(Created: 2015-06-07 22:11:04 / Modified: 2022-12-22 21:58:42)

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