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.
