INTRODUCTIONYounger racers may be smaller in stature, but that doesn’t mean they can’t have a giant-sized heart for racing—and winning. So for these younger racers, Honda designed the CRF150R/RB as an integral part of the CRF® racing lineup.
ENGINE/DRIVETRAIN

Liquid-cooled 149cc,4-stroke engine offers unrivalled performance and ease of use.

Lightweight, compact, internal auto decompression and handlebar-mounted hot-start system provide easy starting, hot or cold

Crankshaft is made of high-strength, low-carbon steel with carburised main journals for maximum durability at sustained high-rpm operation

CHASSIS/SUSPENSION

Front and rear suspension settings unique to the CRF®150R deliver ideal bump-absorption characteristics

Handlebar bend optimizes rider position and comfort

Lightweight, high-tensile steel frame with large-diameter frame tubing and cross-member provides excellent turning performance and straight-line tracking

ADDITIONAL FEATURES

Large-capacity airbox and reusable two-stage foam air filter

Lightweight plastic body components (radiator shroud, sidecovers, rear fender, seat base, fuel tank, front fender and front number plate) offer a slim, aggressive style

Seat-cushion foam follows the shape of the fuel tank, providing a smooth transition to increase rider mobility and comfort

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 .
ENGINEHonda’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 .
SUSPENSIONThe SFF-AIR-TAC front suspension has been developed for the CRF250R by Showa to unlock the frame’s extra performance potential and shaves 1.3kg weight compared to the 14YM .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 TYPE249cc Liquid-cooled 4-stroke single cylinder uni-cam
BORE AND STOKE76.8mm x 53.8mm
COMPRESSION RATIO13.5 : 1
CARBURATIONFuel injection
IGNITIONFull transistor
STARTERKick
CLUTCHWet multiplate
TRANSMISSIONConstant mesh
DRIVEChain
DIMENSIONS2,181mm x 827mm x 1,271mm (LxWxH)
WHEELBASE1,489mm
SEAT HEIGHT951mm
GROUND CLEARANCE322mm
FUEL CAPACITY6.3 litres
FRONT TYRE80/100-21inch
REAR TYRE100/90-19inch
FRONT SUSPENSIONShowa 49mm inverted SFF-TAC air fork (310mm stroke)
REAR SUSPENSIONShowa monoshock using Honda Pro-Link system (317.6mm stroke, 133mm axle travel)
FRONT BRAKE260mm hydraulic wave disc
REAR BRAKE240mm hydraulic wave disc
KERB WEIGHT105.2kg

INTRODUCTIONThe CRF450R has proven itself a big hitting package at all levels , while its reliability , longevity and build quality have set the benchmark .And it has constantly evolved ; every single model year since its inception has delivered updates from Honda’s busy competition program around the world .In the 2015 season Honda’s development engineers have chosen to make small changes that make a big difference , and the new CRF450R – out of the crate – is about as close as it’s possible to get to the feel of a Factory MX1 machine .
FRAMEThe CRF450R’s mass-centralised core and low centre of gravity reduce physical inertia with improved high-speed stability . Rake of 27.40°, with trail of 114mm and wheelbase of 1,492mm gives razor-sharp turn-in and increased feel for available traction ; all-up kerb weight is 111kg . The aluminum swingarm provides massive rigidity for less deflection in ruts and improved corner-exit traction .
SUSPENSIONNow in its second generation the KYB PSF2s build their advantage in directional stroke transitions from compression to rebound . Within each leg a revised ‘upright’ cartridge structure with 32mm piston saves critical unsprung weight , while on the compression damping side a new design uses internally charged pressure to eliminate the sealing material . This has reduced friction by 10% , creating front suspension with enhanced response and feel .
ENGINE

Increased power and torque off the very bottom with a smoothed , linear delivery through the middle plus increased peak output and extra rpm at the top end are the net results of the engineers’ development time .

This gives the rider confidence to get on the gas early , pick up consistent drive on and through the turn with extra rpm up top to reduce gear changing .

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 .

ENGINE TYPE449cc Liquid-cooled 4-stroke single cylinder uni-cam
BORE AND STOKE96.0mm x 62.1mm
COMPRESSION RATIO12.5 : 1
CARBURATIONFuel injection
IGNITIONFull transistor
STARTERKick
CLUTCHWet multiplate
TRANSMISSIONConstant mesh
DRIVEChain
DIMENSIONS2,188mm x 827mm x 1,271mm (LxWxH)
WHEELBASE1,492mm
SEAT HEIGHT952mm
GROUND CLEARANCE329mm
FUEL CAPACITY6.3 litres
FRONT TYRE80/100-21inch
REAR TYRE100/90-19inch
FRONT SUSPENSIONKayaba 48mm inverted PFS2 (310mm stroke)
REAR SUSPENSIONKayaba monoshock using Honda Pro-Link system (315 stroke, 133.5mm axle travel)
FRONT BRAKE260mm hydraulic wave disc
REAR BRAKE240mm hydraulic wave disc
KERB WEIGHT111kg