2013 HONDA CRF250R

2013 HONDA CRF250R

Release date: 29th May 2012

Model updates: The CRF250R’s championship winning performance is further upgraded with stronger low and mid-range torque, plus fine-tuned suspension.

Contents:

1)      Introduction

2)      Model overview

3)      Key features

4)      Accessories

5)      Technical specifications

1. Introduction

Championship winning motorcycles cannot stand still; even though a Honda CRF250R won both U.S. Supercross Lites titles in 2012, knowledge acquired in both campaigns has been fed into development of the 2013 model. Large improvement in racing performance is often the sum of many small, marginal gains and nowhere is this more true than the highly-competitive 250cc motocross arena, where even the smallest change can have the biggest effect.

Honda has chosen to carefully evolve the CRF250R, as it has proven to be what is one of the most complete and well-balanced 250cc packages available to buy, enjoy, and race.

2. Model Overview

Honda’s engineers focused their efforts around the CRF250R’s engine and suspension performance. The engine’s response at low and mid-rpm has been boosted thanks to recalibration of the fuel injection, while the rear shock has been revised with new internals and damping rates. The front fork has a new, stiffer spring with damping to match. Taking advantage of the suspension’s upgraded performance are new Dunlop tyres; offering improved traction the rear also saves weight.


3. Key Features

3.1 Engine

The CRF250R’s 249cc, liquid-cooled four-valve Unicam engine has always impressed riders of all abilities with its broad spread of useable power, everywhere in the rev-range, plus a pin-sharp and instant throttle response. Bore and stroke remains 76.8mm x 53.8mm, with compression ratio at 13.2:1; the 30.5mm titanium inlet valves and 25mm steel exhaust valves are unchanged.

For improved drive and traction out of corners revised mapping of the PGM-FI fuel injection has boosted low/mid-range torque and power, and also allows the engine to make a little more power at peak rpm. To meet FIM noise regulations the rear exhaust muffler also features a new ‘Triangle Punch’ design on the internal baffle. A Honda patent, the pattern is highly efficient at passing exhaust gas to the glass wool wrapping, and at high rpm reduces noise output by 2dB with no loss of performance.

3.2 Chassis

The CRF250R’s steering geometry, aluminium twin-beam frame and swingarm are unchanged, but the Showa 48mm inverted cartridge forks feature new springs with a stiffer (from 4.4 to 4.6 Kg/cm) rate, for more precise handling through extra-rough sections of track. The forks’ internal sub-piston diameter has increased from 35mm to 37mm, for improved low speed damping. Both rebound and compression damping can be adjusted through 16 positions.

A redesigned internal damper adjuster bolt (up 2mm in diameter to 11.5mm), guide and coil spring improves the Showa rear shock’s high-speed control and bump absorption. Damping rates are firmer to suit. The Pro-Link rear suspension has 12.3in travel, plus spring preload adjustment and 17-position rebound adjustment. Compression damping is separated into 13-position (low-speed) and 3.5 turns (high speed).

The Dunlop MX51 Geomax 81/100-21 front tyre features a subtle tread pattern change that helps traction and aids rider confidence. The 100/90-19 MX51 tyre saves 400g of all-important unsprung weight from the rear wheel, using a lighter inner structure, with no loss of rigidity or grip. Protecting the front 240mm wave pattern disc and two-piston brake caliper is a new, two-piece cover identical to that fitted to the 2013 CRF450R; the rear 240mm wave-pattern disc and single-piston caliper also gets a CRF450R-spec cover.


4. Technical Specifications – CRF250R (ED-type)

ENGINE

Type                                        4 stroke single uni-cam

Displacement                          249.4cc

Bore x Stroke                          76.8 x 53.8

Compression Ratio                 13.2:1

Max. Power Output                27.9KW @ 11,000 r/min

Max. Torque                           26.2Nm @ 8,500 r/min

FUEL SYSTEM

Carburation                             FI

Fuel Tank Capacity                5.7L

ELECTRICAL SYSTEM

Ignition System                       Full transister

Starter                                     Kick

DRIVETRAIN

Clutch                                      Multi plate wet clutch

Transmission                           5 speed, constant mesh

Primary Reduction                  3,166

Gear Ratios

1st 2,357

2nd 1,888

3rd 1,555

4th 1,333

5th 1,136

Final Reduction                       3.769  (49/13)

Final Drive                               Chain

FRAME

Type                                        Aluminium twin tube

CHASSIS

Dimensions     (LxWxH)         2,181 x 827 x 1,271mm

Wheelbase                              1,489mm

Caster Angle                           27⁰

Trail                                         117mm

Seat Height                             951mm

Ground Clearance                  322mm

Kerb Weight                            105kg

SUSPENSION

Type                                        Front:   48mm inverted, 310mm stroke (275mm axle

travel), fully adjustable

Rear:   Pro-link, Fully adjustable mono shock, 133mm stroke

WHEELS

Type                                        Wire spoke

Rim Size                                 Front:   21 x 1.60

Rear:   19 x 1.85

Tyre Size                                 Front:   80/100-21

Rear:   100/90-19

BRAKES

Type                                        Front:   240mm Hydraulic disc

Rear:   240mm Hydraulic disc

All specifications are provisional and subject to change without notice.

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