Honda CRF250R
Skirmishing in a close fought arena of competition, the CRF250R has consistently proven itself a polished performer. Its blend of power – the fluid way it produces it – and razor-sharp handling agility combin...
INTRODUCTION
In 2014 HRC’s engineers upgraded the CRF250R with the same aluminium beam frame and over-arching design philosophy of mass-centralisation as the CRF450R .
The new 2015 CRF250R expands on this direction of development with chassis and engine upgrades that tie it even closer to its larger capacity sibling , enhancing further its ability to cut lap times in the hands of both professional and amateur riders alike .
ENGINE
Honda’s 249cc MX power plant gained a redesigned cylinder head and inlet exhaust porting , with increased compression ratio . At this point in development HRC’s engineers focused on the rider’s ability to easily adjust the engine to suit conditions and riding style , plus exhaust efficiency and throttle feel.
The four-valve Unicam unit has always impressed with its broad spread of useful power no matter the revs , plus sharp throttle response.
Adding Honda’s EMSB to the mix has increased its usability further . This is a bonus for the club racer in particular ; rather than set up during the week and hope for matching condition at the weekend (or take a laptop to the track) , the rider just has to stop with the engine at idle and press and hold the button for just under a second to select the next map in sequence .
SUSPENSION
The fully adjustable right fork leg controls both compression and rebound damping force while the left fork leg compresses air using a damper-less structure . This distribution achieves a controlled right/left balance , enhancing reaction over bumps and stability while hard on the front brake.
Three chambers are employed by the left fork leg to manage effective ‘spring’ rate . The Balance chamber operates from the off and at low speed ; the Inner chamber is responsible for the mid-range stroke and the Outer Cylinder chamber is used as the forks near their bump stops.
Specifications
Engine
- ENGINE TYPE 249cc Liquid-cooled 4-stroke single cylinder uni-cam
- BORE AND STROKE 76.8mm x 53.8mm
- COMPRESSION RATIO 13.5 : 1
- CARBURATION Fuel injection
- IGNITION Full transistor
- STARTER Kick
- CLUTCH Wet multiplate
- TRANSMISSION Constant mesh
- DRIVE Chain
FRAME
- DIMENSIONS 2,181mm x 827mm x 1,271mm (LxWxH)
- WHEELBASE 1,489mm
- SEAT HEIGHT 951mm
- GROUND CLEARANCE 322mm
- FUEL CAPACITY 6.3 litres
- KERB WEIGHT 105.2kg
SUSPENSION
- FRONT Showa 49mm inverted SFF-TAC air fork (310mm stroke)
- REAR Showa monoshock using Honda Pro-Link system (317.6mm stroke, 133mm axle travel)
BRAKES
- FRONT 260mm hydraulic wave disc
- REAR 240mm hydraulic wave disc
TYRES
- FRONT 80/100-21inch
- REAR 100/90-19inch
