First Look: 2017 Honda CRF450R

Scritto giovedì 11 agosto 2016 alle 09:31.

First Look: 2017 Honda CRF450R

Ovviamente l’articolo è by VitalMX.com, come i testi in inglese che probabilmente nella giornata verranno tradotti, per ora vi inseriamo tutto così, potete apprezzare le nuove strutture della nuovissima Honda CRF 450R 2017, un opera d’arte del Motocross moderno!
Buona lettura e state connessi che arrivano le traduzioni!

PS: C’è anche la versione Enduro, la inseriamo per conoscenza….

PS2: Se CLICCATE il link qui sotto troverete le spiegazioni in italiano!

Honda CRF450R 2017 presskit (CLICCARE)

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It’s finally time, the bike that’s had the most talk of the year, the 2017 Honda CRF450R and its official info are finally revealed. After seeing it through a fence and down our lens a few weeks ago, we’re glad to see that the rumors were quite true and to confirm a lot of what he had learned the other day, along with surprising us with some goodies we didn’t expect.

Starting off, the forks, what everyone wants to know! Yes, the 2017 CRF450R does come with spring forks. More specifically, a production version of Showa’s latest generation twin-chamber A-kit level suspenders. These forks feature 49mm lower tubes, 14mm damping rods, and 25mm pistons; the same stuff used in Honda’s own works level forks just a few years ago. Having these forks on a production bike are a huge step, namely because of the cost involved in production. Just to confirm for those still scratching their heads, yes, these forks have springs in both sides and no air chamber to fiddle with.

Probably the second highest question on people’s minds, does it come with electric start? Not quite, but the rumors were true, it will be an optional part. The CRF450RX comes with it stock and you can get the electric starter and wiring harness as separate part numbers for the R model. This kit doesn’t have an exact price yet, but is expected to cost around $650 and doesn’t include a battery. The quality and weight of battery will depend on how much you’d like to personally spend. The electric started will be fairly straight forward to install, as there are mounting points on the back of the engine case for it, along with a plug in the backside of the kickstarter housing, which can be removed to insert the drive mechanism from the new electric starter.

Massive talking point for the new CRF450R is in the power plant. While the engine is technically all new, there are a few key changes. One, the intake is a downdraft design, similar to the Yamaha, but without spinning the cylinder head around. Due to a lower mounted shock, they were able to get their intake tract above the shock, giving it a straight shot into the cylinder head (without having to wrap around the shock first) and allowing for less intake angle while entering the combustion chamber. To match this, the valve angles have been decreased, and the valves enlarged by 2mms. Beyond this, they’ve also bumped the compression ratio from 12.5:1 to 13.5:1. Along with more aggressive cam lift and duration, this engine pumps out quite a bit more power. How much? According to the American Honda staff, the 2016 model produced 54.5 horsepower to the crank on their engine dyne, while the 2017 engine is putting out just about 60 horsepower on the same engine dyno. Equating to roughly a five-and-a-half (5.5) horsepower gain! Putting the Honda back into a more competitive light in pure numbers when compared to the competition.

Specifications – 2017 Honda CRF450R

  • Engine Type: 449.7cc liquid-cooled single-cylinder four-stroke
  • Bore x Stroke: 96.0mm x 62.1mm
  • Compression Ratio: 13.5:1
  • Induction: Programmed fuel-injection system (PGM-FI); 46mm throttle bore
  • Ignition: Full transistorized ignition
  • Transmission: Constant-mesh 5-speed return
  • Final Drive: 520 chain; 13T/49T
  • Valve Train: Unicam® OHC, four-valve; 10.0mm intake, steel; 8.8mm exhaust, steel
  • Front Suspension: 49mm fully adjustable leading-axle inverted telescopic Showa coil-spring fork; 12.0 in. travel
  • Rear Suspension: “Pro-Link swingarm system; fully adjustable Showa single shock; 12.4 in. travel.
  • Front Brakes: Single 260mm hydraulic disc
  • Rear Brakes: Single 240mm hydraulic disc
  • Front Tires: Dunlop Geomax MX3S 80/100-21 55M with tube.
  • Rear Tires: Dunlop Geomax MX3S 120/80-19 55M with tube.
  • Rake (Caster Angle): 27°22’
  • Trail : 116.0mm (4.6 in.)
  • Seat Height: 37.8 in.
  • Ground Clearance: 12.9 in.
  • Wheelbase: 58.3 in.
  • Fuel Capacity: 1.6 gal.
  • Color: Red
  • Curb Weight (Full tank of fuel, lubricants, tires, ready to ride): 243 lbs.
  • MSPR: To be Announced.

Cole Seely: Riding the 2017 Honda CRF450R – More Motocross Videos

Honda Press Release Below:

Since its 2002 introduction, the CRF450R has earned an enviable racing pedigree, and the 2017 edition is the best yet, with superior technology and style. Riders know that the most important part of any motocross race is the start, and the new CRF450R Unicam® engine has been developed to achieve overwhelming performance in the first 100 feet of battle, offering increased power output but also allowing unparalleled traction. And while arriving to turn one first is significant, winning requires staying in front for the entire moto, which is why Honda engineers designed an all-new chassis with reduced weight and centralized mass. The result is a machine that is at once fast, reliable and forgiving, and that allows riders to more easily extract maximum performance, consistently turning low lap times while simultaneously taxing their bodies less.

Engine/Drivetrain

  • Downdraft intake layout increases power by reducing resistance, improving air-charging efficiency.

  • New combustion chamber with higher compression ratio, decreased valve angle for greater efficiency.

  • Use of finger rocker arm allows increased valve lift while retaining compact Unicam layout.

  • Coils on valve springs have oval cross-sections to allow low engine height.

  • New port layout with straighter flow for increased efficiency.

  • New piston with improved combustion efficiency.

  • Diamond-like carbon (DLC) on piston pin, rocker arm reduces friction, increases durability.

  • New, compact dual muffler with more-gradual pipe bends for smoother exhaust flow.

  • Shallower clutch assembly with fewer, thicker plates for narrower engine width.

  • Kick start standard, with electric start available as an accessory.

Chassis/Suspension

  • New layout allows improved traction through concentration of mass, lower center of gravity.

  • New, lighter sixth-generation aluminum twin-spar frame with revised geometry; allows improved cornering performance through reduction of torsional stiffness (lateral stiffness is unchanged).

  • New, lighter swingarm assembly with increased vertical and lateral stiffness.

  • New rear-suspension location lowers center of gravity.

  • Narrower cross section (down 30mm at radiator shrouds).

  • Aluminum rear subframe with extruded gussets for lighter weight.

  • Showa fork is now 49mm (up 1mm), with coil springs replacing air system.

  • New, lighter titanium fuel tank.

  • Kill switch/ignition-map-adjustment switch combined into one unit for reduced weight.

  • Dunlop Geomax MX3S tires.
  • Plastic bodywork with smoother layout and film-insert graphics for improved appearance and durability.
  • New front fender shape allows more-efficient air path to radiator.

2017 Honda CRF450RX

2017 Honda CRF450RX

To our surprise, Honda had something up their sleeve at their launch event, an all-new model known as the CRF450RX. We say a new model because this isn’t a replacement for the X model CRF450, but a new bike and model to take on the ever expanding off-road racing/cross country segment. Being that this is considered a serious off-road race bike, it’s based directly off the new 2017 Honda CRF450R, but with a few key changes.

Honda Press Release Below:

For 2017, Honda offers the brand-new CRF450RX, which is based on the 2017 CRF450R but with a number of differences that make it appropriate for closed-course off-road racing like the GNCC series campaigned by the JCR Honda team. Like its motocross-focused sibling, the CRF450RX is designed for maximum agility and performance, offering owners superior power along with effortless handling—the ideal woods-racing combination.

Engine/Drivetrain:

Smoother ignition map than CRF450R for better performance in low-traction situations.

Downdraft intake layout increases power by reducing resistance, improving air-charging efficiency.

Combustion chamber with high compression ratio, narrow valve angle for efficiency.

Use of finger rocker arm allows high valve lift while retaining compact Unicam layout.

Coils on valve springs have oval cross-sections to allow low engine height.

Port layout with straight flow for efficiency.

Diamond-like carbon (DLC) on piston pin, rocker arm minimizes friction, increases durability.

Dual muffler with gradual pipe bends for smooth exhaust flow.

Standard electric start, with kick start as a backup.

Chassis/Suspension:

Compared to CRF450R, suspension settings are more appropriate for technical off-road conditions.

With a 2.25 gallon capacity, the plastic fuel tank is larger than that of the CRF450R for increased range off-road.

Forged-aluminum side stand is standard to allow trailside parking.

Off-road-focused, durable Dunlop Geomax AT81 tires.

One-tooth larger rear sprocket than CRF450R, for better performance in tight woods conditions.

Different cylinder hanger than CRF450R, for comfort in technical off-road conditions.

Chassis layout maximizes traction through concentration of mass, low center of gravity.

New, lighter sixth-generation aluminum twin-spar frame with revised geometry; allows improved cornering performance through reduction of torsional stiffness (lateral stiffness is unchanged).

Lightweight swingarm assembly is stiff vertically and laterally.

Rear-suspension location lowers center of gravity.

Lightweight aluminum rear subframe with extruded gussets.

Coil-spring 49mm Showa fork.

Plastic bodywork with smooth layout and film-insert graphics for appearance and durability.

Front fender shape allows efficient air path to radiator.

Credit: ML512 by VITALMX.COM

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