2005 Honda CRF250R Motocross Model

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4Strokes
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2005 Honda CRF250R Motocross Model

Postby 4Strokes » Tue Jul 05, 2016 9:02 am

05crf250r.jpg
New for the 2005 Honda CRF250R

A completely new engine design and a host of chassis improvements create a brand-new CR250R- a machine destined to be a winner in 2005. Consult owner's manual for optional racing parts. Suggested Retail: $5,999 USD.

Specifications
Model: CRF250R
Engine Type: Type: 249cc liquid-cooled single-cylinder 4-stroke, Unicam; 4-valve
Bore and Stroke: 78mm x 52.2mm, Compression Ratio: 12.5:1
Carburetion: Keihin 37mm flat-slide with throttle position sensor (TPS)
Ignition: Solid-state CD with electronic advance
Transmission: Close-ratio five-speed, Final Drive: #520 chain; 13T/51T
Susp., F: 47mm inverted Showa cartridge fork, 16 rebound & comp. damping; 12.4" travel
Susp., R: Pro-Link Showa shock, spring pre-load, 17 rebound & comp. damping (13 lo & 3.5t hi); 12.4" travel
Brakes, Front: Single 240mm disc, 2-piston caliper; Rear: Single 240mm disc
Tires, Front: 80/100-21; Rear: 100/90-19
Wheelbase: 58.2 inches
Rake (Caster Angle): 27.50°
Trail: 123 mm (4.8 inches)
Seat Height: 38 inches
Ground Clearance: 14.2 inches
Dry Weight: 204 pounds
Fuel Capacity: 2.0 gallons
Color: Red

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4Strokes
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Posts: 1224
Joined: May 02, 2016

New for the 2005 Honda CRF250R

Postby 4Strokes » Mon Dec 04, 2017 3:23 pm

  • New cylinder design features RC exhaust valve housed in removable case for improved sealing and performance.
  • New precision-cut stainless steel cylinder base gasket and revised port timing for improved bottom-end and mid-range power.
  • New cylinder head combustion chamber shape for improved bottom-end and mid-range power. New one-piece exhaust valve for improved sealing.
  • New piston dome shape for improved intake charge flow.
  • New piston features single keystone piston ring for reduced friction and improved sealing.
  • New crankshaft design for improved drivability.
  • New crankcase with redesigned intake port for smoother air flow and increased journal thickness to decrease crank deflection.
  • New six-petal reed valve with narrower profile for stronger bottom-end power.
  • New reed valve mounting angle to improve charge flow and top-end power.
  • New ECU mapping and RC valve control settings to match new engine power characteristics.
  • New exhaust pipe shape has increased volume for improved low- to mid-range power.
  • Thicker radiator core (from 24mm to 28mm) improves cooling capacity to handle extra power.
  • New front axle placement for improved fork action and turning.
  • New swingarm features a dual-axis, double-taper design with a large cast aluminum cross member that is lighter weight and stronger.
  • New rear hub is stronger and lighter.
  • New rear shock valving for improved bump absorption.
  • New Honda Racing-inspired graphics.


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