Fuel injected 2010 Honda CRF250R breaks cover
Honda's 2010 model motocross bikes have broken cover with confirmation of EFI on a heavily revised CRF250R for the new year.
Honda's 2010 model CRF250R has received an overhaul for the new year
Honda’s 2010 model motocross bikes have broken cover in the United States over the weekend, with the big news being the confirmation of fuel injection on a heavily revised CRF250R for the new year.
As expected, the new 250 four-stroke has followed in the footsteps of its big brother CRF450R after it was revised with EFI for this year amongst a host of technical and styling changes.
Most notable for the new CRF250R is the EFI, an all-new compact engine packed into a new frame, and an updated cosmetic package, and a return to a single exhaust pipe after a number of years with a dual muffler configuration.
According to a press release issued by American Honda, the full list of changes and features for the model are as follows (expect details from Honda Australia this week with availability and pricing details):
New for 2010 Dark Country ipod
• All-new, more compact engine.
• Programmed Fuel Injection (PGM-FI).
• Progressive Steering Damper (HPSD)-equipped aluminium frame
• All-new front and rear suspension, featuring upper and lower fork tubes and a shock body developed exclusively for the CRF250R chassis.
• Redesigned higher-capacity airbox for enhanced breathing and increased power also improves filter access.
• All-new single-muffler exhaust system improves mass centralization.
• All-new bodywork.
Engine/Drivetrain
• All-new compact engine.
Fuel injection is featured on the new model
• Liquid-cooled four-valve Unicam(r) 249cc engine.
• Engine completely redesigned for improved power delivery from a significantly more compact package that lowers the centre of gravity and enhances mass centralization for improved handling.
• New forged slipper-piston material permits a thinner crown. Low-friction surface treatment ensures high-rev potential.
• All-new Programmed Fuel Injection system (PGM-FI) utilizes a 50mm throttle body with 12-hole injector fed by lightweight 50-psi pump to ensure optimum fuel atomization and precisely targeted fuel charge. System also improves fuel consumption.
• PGM-FI system monitors throttle position, intake air and coolant temperatures and manifold pressure to accurately map fuel charge and ignition spark, significantly improving partial-throttle response and helping to ensure excellent rideability.
• AC generator enlarged to service the PGM-FI system. Two crankshaft position sensors quickly determine crank position to provide quick starts, hot or cold.
• New mechanical water pump seal improves durability
• Kashima coating applied to the clutch basket and clutch centre improves clutch life and feel.
• All-new transmission ratios match engine power output.
Chassis/Suspension
• All-new HPSD-equipped Twin-Spar Aluminium Frame with forged-aluminium steering head. Spar height was reduced (70mm to 66mm) and width was narrowed (27mm to 26mm). Stronger downtubes improve front-end feel.
• Steering response and overall handling were improved by positioning the front wheel 15mm farther back and closer to the crankshaft.
• Frame, steering head and swingarm modifications permit a reduction in triple-clamp offset (22mm to 20mm).
• Removable rear subframe was redesigned to eliminate brackets. Shape altered to improve air filter access and narrow the bike profile.
• HPSD features a compact damper attached to the lower triple clamp and the steering head to allow more aggressive steering characteristics and assist straight-line handling. Damping action smoothly progresses as handlebar deflection increases, which produces very natural steering characteristics and feel.
• Pro-Link Rear Suspension features exclusive Showa integrated reservoir with all-new damping and spring settings.
• Brake system integrates the rear master-cylinder and fluid reservoir, eliminating the separate reservoir and hose.
• Link-type front-brake master cylinder and a lightweight brake rotor provide strong braking.
Additional Features
A single exhaust returns for 2010 rather than the two used on recent models
• Engine stop switch features an integrated LED pre-ride check indicator. This confirms the PGM-FI system is operating normally.
• All-new higher-capacity airbox improves filter access.
• PGM-FI tuning connectors located behind radiator shroud for easier access
• Redesigned larger radiators, improve cooling performance
• New fuel-tank tether eliminates need to disconnect fuel line to work on top end.
• Rider ergonomics are optimized by adapting the handlebar, seat and footpeg height to place the rider’s legs at the narrowest part of the frame for improved comfort and handling feel.
• Adjustable front-brake lever for improved control.
• Quick-adjust clutch perch for easy cable adjustment.
• Aluminium Renthal handlebar (971 bend) is rubber-mounted to help reduce rider fatigue and improve comfort.
Meanwhile the CRF450R has received minor revisions for 2010, including refinements to the fuel injection system that debuted this year, along with an auto-decompression system and revised suspension settings.
Stay tuned to MotoOnline.com.au for full details on the Australian release dates and prices when they are announced, as well as testing as soon as the models are released on local shores.
HONDA AUSTRALIA:
Honda’s 2010 CRF250R sets a higher benchmark than ever for impressive power and class-leading handling all rolled into one competition-ready package.
Honda didn’t have to look far for inspiration, adapting many of the same cutting-edge features found on the Pro Open class-leading CRF450R.
Boasting an all-new, more powerful, more compact engine with Programmed Fuel Injection (PGM-FI) combined with an all-new Twin Spar Aluminum Frame featuring the Honda Progressive Steering Damper (HPSD), the 2010 CRF250R continues Honda’s long-standing position of class dominance.
Its lighter weight, more potent liquid-cooled four-valve Unicam engine sports new forged slipper-piston material that permits a thinner crown. Low-friction surface treatment ensures high-rev potential, whilst the PGM-FI system ensures optimum performance and improved fuel consumption.
Overall, the changes to the engine incorporate an automatic variation of fuel flow and ignition timing depending on conditions, whilst gear ratios have also been revised to suit the overhauled engine. The bike also incorporates larger radiators as well as more durable pistons and valves.
An all-new single-pipe exhaust system design moves the muffler closer to the bike’s centre of mass, improving weight distribution and handling.
Its longer swingarm also improves stability as does larger diameter front forks and a lighter repositioned rear shock.
In addition to all-new bodywork borrowed from the CRF450R, Honda’s smaller motocrosser offers improved steering response and overall handling via a repositioned front wheel.
The new CRF250R will be released toward the end of the year.Pinocchio download
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