| 词条 | Honda CRF450R | ||||||||
| 释义 |
|name = Honda CRF450R |image = |caption = |aka = |manufacturer = Honda Motor Company |parent_company = |production = |model_year = |assembly = |predecessor = |successor = |class = Motocross |engine = Single-cylinder, SOHC, Multivalve, water-cooled, four-stroke |bore_stroke = |compression = |top_speed = |power = |torque = |ignition = |transmission = |frame = |suspension = |brakes = |tires = |rake_trail = |wheelbase = |length = |width = |height = |seat_height = |dry_weight = |wet_weight = |fuel_capacity = |oil_capacity = |fuel_consumption = |turning_radius = |related = |sp = }} The Honda CRF450R is a four-stroke racing motocross motorcycle built by Honda Motor Company. It is the successor to the Honda CR250R two-stroke. The Honda CRF450X is the enduro version of the Honda CRF450R. Notable changes
First generation: 2002-2004{{Infobox Motorcycle| name = First Generation CRF450R | image = | aka = | parent_company = | production = 2002-2004 | predecessor = Honda CR series | successor = Second Generation CRF450R | engine = 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 11.5:1 compression | power = | torque = | transmission = 5-speed | suspension = Front: 305mm travel Rear: 315mm travel | brakes = Single disc, 240mm | tires = | rake_trail = | wheelbase = 59.4 in | length= | width= | height= | seat_height = 28.6 in | dry_weight = 224.9 lbs{{citation needed|date=July 2016}} | wet_weight = | fuel_capacity = 2.4 gals | related = | similar = }} The CRF450R was introduced in 2002. Unlike the competing Yamaha YZ426, the first generation CRF450R has an aluminum frame. In 2003, Honda added a longer shock and new linkage to raise the rear end and steepen the head angle. In 2003, camshaft, exhaust, and ignition map were revised. The handlebar size was changed to {{Convert|7/8|in|abbr=on}} in 2004. Second generation: 2005-2008{{Infobox Motorcycle| name = Second Generation CRF450R | image = | aka = | parent_company = | production = 2005-2008 | predecessor = First Generation CRF450R | successor = Third Generation CRF450R | engine = 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.0:1 compression | power = | torque = | transmission = Close-ratio five-speed | suspension = Front: 47mm inverted Showa cartridge fork with rebound and compression damping adjustability; 12.4 inches travel Rear: Pro-Link Showa single shock with spring preload, rebound damping adjustability, and high/low-speed compression damping adjustability; 12.5 inches travel | brakes = Front: Single 240mm disc with twin-piston caliper Rear: Single 240mm disc | tires = Front: 80/100-21 Rear: 110/90-19 | rake_trail = 26.79°, 109.4mm | wheelbase = 58.7 in | length= | width= | height= | seat_height = 37.6 in | dry_weight = 218.5 lbs (claimed)[1] | wet_weight = | fuel_capacity = 1.9 gals | related = | similar = }} The second generation CRF450R had a redesigned motor and frame with new bodywork styling from the new CRF250R. In 2008, the Honda Progressive Steering Damper (HPSD) was introduced, allowing the steering geometry to be more aggressive. Third generation: 2009-2012{{Infobox Motorcycle| name = Third Generation CRF450R | image = | aka = | parent_company = | production = 2009-2012 | predecessor = Second Generation CRF450R | successor = Third Generation CRF450R | engine = 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.0:1 compression | power = | torque = | transmission = Close-ratio five-speed | suspension = Front: 48mm inverted KYB Air-Oil-Separate (AOS) with rebound and compression damping adjustability; 12.2 inches travel Rear: Pro-Link KYB single shock with spring preload, rebound damping adjustability, and high/low-speed compression damping adjustment; 12.6 inches travel | brakes = Front: Single 240mm disc with twin-piston caliper Rear: Single 240mm disc | tires = Front: 80/100-21 Rear: 120/80-19 | rake_trail = 26° 52', 114.2mm | wheelbase = 58.7 in | length= | width= | height= | seat_height = 37.6 in | dry_weight = | wet_weight = 234.8 lbs (claimed)[2] | fuel_capacity = 1.5 gal | related = | similar = }} The third generation CRF450R had fuel-injection and an all-new bike to match. Fourth generation: 2013-2016{{Infobox Motorcycle| name = Fourth Generation CRF450R | image = | aka = | parent_company = | production = 2013– | predecessor = Third Generation CRF450R | successor = | engine = 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.5:1 compression | power = | torque = | transmission = Close-ratio five-speed | suspension = Front: 48mm inverted KYB PSF® (Pneumatic Spring Fork) with rebound and compression-damping adjustability. 12.2 inches travel. Rear: Pro-Link® KYB single shock with adjustable spring preload, rebound damping adjustability, and high/low-speed compression damping adjustment. 12.4 inches travel | brakes = Front: Single 240mm disc with twin-piston caliper Rear: Single 240mm disc | tires = Front: Dunlop MX51FA 80/100-21 Rear: Dunlop MX51 120/80-19 | rake_trail = 27° 04', 116mm | wheelbase = 58.7 in | length= | width= | height= | seat_height = 37.5 in | dry_weight = | wet_weight = 242.7 lbs (claimed)[3] | fuel_capacity = 1.66 gal | related = | similar = }} The fourth generation of the CRF450R introduced a new twin-exhaust to centralize mass. Also new to the fourth generation were air forks. Fifth generation: 2017-2018The 2017 CRF450R offers a new engine design and optional electric start. The air forks were switched out in favor of Showa coil spring forks. Sixth generation: 2019-presentThe 2019 CRF450R features an all-new chassis and swingarm and a launch control setting. See also
References1. ^[https://web.archive.org/web/20160818170235/http://news.honda.com/newsandviews/article.aspx?id=2374-en] {{Motorcycle-stub}}2. ^[https://web.archive.org/web/20160818183555/http://news.honda.com/newsandviews/article.aspx?id=4729-en] 3. ^[https://web.archive.org/web/20160818192914/http://news.honda.com/newsandviews/article.aspx?id=6701-en] 1 : Honda motorcycles |
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