Cross-country motorcycle composition 200 words.

Because of environmental protection, the mountain climbing vehicle that used to be dominated by two-stroke machine should also be dominated by four-stroke machine. In order to make up for the congenital deficiency of four-stroke machine, professional off-road motorcycles will be equipped with the highest specification four-stroke single-cylinder engine. Honda CRF250 is a typical example. The excellent MX off-road motorcycle is one of the strongest 250 off-road motorcycles in the world.

The first generation of CR250R appeared as early as 1977. After more than 20 years of continuous evolution, it was renamed CRF250R in September 2003, and it was launched with new specifications, which immediately caused a sensation in the whole off-road motorcycle industry. In September 2005, Honda announced the new improvement of CRF250R in 2006.

Honda is famous for its durability and reliability, so the new improvement in 2006 only changed the throat and increased the caliber of carburetor to improve its performance. Although the new changes did not increase the peak output of the engine, the throttle response was more pungent, and the output was more surging after 6000 rpm, but the tail still maintained the previous level.

The weight of CRF250R is only 93.5kg, but the peak output exceeds 42ps and the torque is as high as 2.9 1kg-m! If CRF250R can be converted into street accessories, that would be the best! Looking at the specification table of CRF250R again, we thought we had taken the wrong record of a sports car: aluminum alloy double-wing beam cradle frame, 47mm inverted front fork, Pro-Link connecting rod tail shock absorber ...................................................................................................................... I wish I could walk in the street. ...

2006 Honda CRF250R Specification Sheet

Engine form

Four-stroke water-cooled SOHC 4 baffle single cylinder

Cylinder diameter x stroke

78.0 mm x 52.2 mm

Compression ratio 12.9: 1.

Total exhaust gas volume

249.4 ml

maximum horsepower

42.9ps/ 1 1, 000 rpm

acrotorque

2.97km2/9500rpm

Frame form

Aluminum alloy double-wing beam bottom cradle type

Transmission system wet multi-piece five-front-speed chain drive

Fuel supply 40 mm FCR carburetor

Tilt forward (r)

27 50′

Traction distance (t)

123mm

Front suspension system

47mm inverted fork, 3 15mm stroke.

Rear suspension system

Pro-Link single-cylinder hydraulic spring with a stroke of 3 13mm.

Tire (front)

80/ 100-2 1 5 1M

Tire (rear)

100/90-19 57m

Front brake system

240mm diameter drill head with double piston floating calipers.

Rear brake system

240mm diameter drilled disc with single piston caliper

Long x wide x high

2172 x 827x1277mm

Wheelbase (of a vehicle)

1479mm

The minimum ground clearance is 36 1 mm.

Seat height

965 mm

dry weight

93.3 kg

Cylinder capacity

7.3 liters