The Honda CB250RS is a 250 cc motorcycle designed for road use. It has a four stroke, four valve, air cooled, single cylinder engine, which was built for the earlier XL250S trail bike. The RS is known for its slim build, with a dry weight of only 128 kg, and nimble handling. The engine featured counter rotating balancers which reduced vibration and allowed a lighter frame. Further weight savings were achieved by making the engine as stressed component. Early models were kick-started (with a completely superfluous automatic decompression lever), while later Deluxe models (designated RS-D) came with electric start and different paintwork. The bike has a front disk brake and rear drum brake, and while it had only a single cylinder, it had twin exhausts.
The engine generates modest power and achieves a top speed of around 150 km/h or 90 mph. Early models sported 26 hp, while later models reached 33 hp. The bike was known for being hard-wearing and reliable. It is also very fuel efficient, achieving up to 70 mpg (3.4 L/100km). One known issue with the bike was that at around 50,000 miles an RS will often suddenly stop and this can usually be traced to a faulty ignition coil in the alternator. The CDI also tended to fail on high-mileage bikes.
Overall the CB250RS is a fun, low cost motorcycle, and has a loyal following among students and delivery riders for both its economical and nimble characteristics. The CB250RS was phased out of production in the mid-late 1980s.
Engine and transmission
Displacement: 248.00 ccm (15.13 cubic inches).
Engine type: Single cylinder.
Stroke: 4.
Power: 26.00 HP (19.0 kW)) @ 8500 RPM.
Compression: 9.3:1.
Bore x stroke: 74.0 x 57.8 mm (2.9 x 2.3 inches).
Valves per cylinder: 4.
Fuel control: OHC.
Cooling system: Air.
Gearbox: 5-speed.
Transmission type final drive: Chain.
Chassis and dimensions
Front tyre dimensions: 3.00-18.
Rear tyre dimensions: 4.10-18.
Front brakes: Single disc.
Rear brakes: Expanding brake.
Other specifications
Top speed: 146.0 km/h (90.7 mph).
Max Power : 26.00 HP (19.0 kW) at 8500 RPM.
Power/Weight Ratio: 0.18 Hp/Kg.
0-100 km/h : 7.6 seconds.
0-60 mph : 7.2 seconds.
Weight incl. oil, gas, etc:148.0 kg (326.3 pounds).
Fuel capacity: 13.00 litres (3.43 gallons).
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