Honda CBX250RS (MC10) 1983

1983 Honda CBX250RS Pictures, Price Specs

1983 Honda CBX250RS is a naked road sports bike equipped with a radial 4-valve DOHC single-cylinder 249cc engine.
Honda CBX250RS
Honda CBX250RS photo in new original/standard condition.
Release date: 1983-05-20

Honda CBX250RS has inherited the basic characteristics of the Honda CB250RS, which is popular for its excellent maneuverability and ease of handling, and has newly designed high-performance air-cooled, 4-cycle, DOHC single-cylinder engine (249cc) with the RFVC (Radial Four Valve Combustion Chamber). The sports bike “Honda CBX250RS” was released on May 20th 1983.

The engine had a valve arrangement and a combustion chamber shape called "RFVC system" at the time. In order to burn the mixture of gasoline and air with ideal efficiency, it is ideal to have a hemispherical combustion chamber. The result was the RFVC system, a radial 4-valve combustion chamber. The output obtained by ideal combustion efficiency was 30ps, and high fuel consumption of 58km per liter (at 50km/h level driving) was also realized. In terms of styling, it's like a general cowlless sport with no sharp points. The transmission is a 6-speed transmission, and the front brake is a disc type (rear is a drum). With a low seat height of 770 mm, it was a high-performance basic model that was easy to handle. In 1985, the CBX250S with a similar model name appeared, but it was a different model with a different engine.

This Honda CBX250RS was developed in pursuit of a high-performance, easy-to-ride basic sports model. The engine employs a groundbreaking RFVC system that realizes a hemispherical combustion chamber with four radially arranged valves for ideal combustion efficiency. As a result, the diameters of the intake and exhaust valves have been expanded, and a center plug system that enhances flame propagation performance has been made possible, greatly improving combustion efficiency and intake and exhaust efficiency. Furthermore, by adopting the DOHC system, high-speed rotation and high output have been achieved with a maximum output of 30PS and a maximum torque of 2.4kg-m. at the same time. In addition, the intake efficiency has been improved from low speed to high speed.

1983 Honda CBX250RS Price

Sales plan (domestic/annual) : 18,000 units (planned).
National Standard Cash Price was 368,000 yen

(Hokkaido and Okinawa prices are 6,000 yen higher and exclude some remote islands.)

Combined with the adoption of the dual carburetor system, it achieves good response and ease of handling in the medium and low speed range and high power in the high speed range.
The frame uses a lightweight, highly rigid semi-double cradle. As for the suspension, the front wheels use hydraulic disc brakes equipped with Honda's unique dual-piston calipers that demonstrate excellent braking power. In addition, newly designed large-diameter spokes with a flat cross section are used for the front and rear wheels. The rear cushion is equipped with a reservoir tank that reduces heat dripping. In addition, the low seat height of 770mm makes it easy to get your feet on, making it a high-performance road sports bike that is even easier to handle.
As a result, Honda's 250cc class sports bikes are enriched with 10 models and 14 types, from on-road to off-road and trekking. This has made it possible to meet the needs of a wider range of customers.

1983 Honda CBX250RS Specifications

Total length (m)2.020
Width (m)0.745
Total height (m)1.060
Length (m)1.360
Minimum ground clearance (m)0.175
Seat height (m)0.770
Vehicle weight (kg)142
Dry weight (kg)129
Capacity (person)2
Fuel consumption (km/L)58.0 (50km/h level running test value)
Slope climbing ability (tanθ)0.46 (about 25 degrees)
Minimum turning radius (m)2.3
Engine modelMC10E air-cooled 4-stroke DOHC 4-valve single cylinder
Displacement(cm3 )249
Compression Ratio10.5
Max output (PS/rpm)30/9,500
Max torque (kg-m/rpm)2.4/8,000
Carburetor modelPH02
Starting methodSelf-operated
Ignition methodCDI
Lubrication methodCombined pumping and splashing method
Lubricant capacity (L)2.0
Fuel tank capacity (L)15
Clutch typeWet multi-plate coil spring
Transmission typeConstant mesh 6-speed return
Transmission ratio1st2.923
2 speed2.000
3 speed1.550
4 speed1.304
5 speed1.125
6 speed1.000
Reduction ratio2.714
Caster (degrees)27
Trail (mm)98
Tire sizeFront90/90-18 51S
Rear110/90-18 61S
Brake typeFrontHydraulic disc brake
RearMechanical leading tray link
Suspension systemFrontTelescopic
RearSwing arm type
Frame formatSemi-double cradle
1983 Honda CBX250RS white
1983 Honda CBX250RS picture - white.

The Honda CBX250RS was the first motorcycle sold in Japan by Honda in May 1983 as a new 250cc sportsbike to replace the popular CB250RS. The engine is based on the XR series and has specific links to the XR350 bottom end, including a 6-speed gearbox and the same oil pump.


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