Yamaha YFZ450
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The Yamaha YFZ450 is a high-performance, four-stroke ATV (All-Terrain Vehicle). Introduced in 2003 as a 2004 model, it was a huge leap forward relative to its competition. It uses many light-weight materials to give it the lowest dry-weight (350 lbs.) of any 450-class sport ATV. They also tend to have more power than that of the Honda trx450r.
This ATV was considered "revolutionary" and the "biggest step toward an off the showroom floor race ready ATV available by any the four major Japanese manufactures". By the end of the 2004 ATV racing season, three of the four National Championships were claimed by riders riding the Yamaha YFZ450: Keith Little, Brandon and Bill Ballance and Brett Oakley.[1]
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[edit] Model Year Changes
The YFZ450 model as a whole has not changed much; however, many small changes have been made throughout its run.
[edit] 2004
- First model-year, introduced all-new
[edit] 2005
- Banana pipe introduced
- Hot start level plug changed from rubber to aluminum
[edit] 2006
- New crankshaft with increased stroke to 63.4mm (up from 62.0 mm. This made it a true 449 cc. Previously a 439 cc engine
- Larger capacity radiator
- Titanium heat-shield
- Longer steering stem, revised handlebars, and thicker padding in seat
- Aluminium rear grab-bar replaces steel design
- Aluminium front bumper to replace steel design
- Replaced the twin-row bearing carrier swingarm with a round-housing swingarm which made adjusting the chain easier
- Twin-piston rear brake calliper
- LED taillight
- Revised head design (very slight difference, parts interchangeable among years 2004-2008)
- Revised carburetion, and ignition timing
- New tire design
- Longer travel rear shock
- New front suspension settings
[edit] 2007
- ProTaper aluminium handlebars
- Revised front brake master cylinder and lever
- Drilled rear brake disc
- Internal oil jet to lubricate piston bottom
- Improved clutch
- better shocks with high and low speed adjustment.
[edit] 2009
- 2009 YFZ 450R for MX
- Fuel injection
- Better suspension 80% bigger reservoirs longer travel
- Aluminium steel hybrid frame
- 405 lbs wet weight
[edit] 2010
- 2010 YFZ 450X for XC
- less suspension travel
- 400 lbs wet weight
- dropped the YFZ 450
[edit] Specifications (2007)
[edit] MSRP
- $6,999 (Base Model)
- $7,449 (Special Edition)
- $7,599 (Bill Ballance Edition)
[edit] Engine
- Type:2004-2005 439cc, 2006-2011 449cc, 4-Stroke Single, Liquid Cooled w/ Fan, Titanium 5-Valve DOHC
- Bore: x Stroke 95 mm x 63.4mm
- Compression Ratio: 11.4:1
- Fuel Delivery—2004-2008 Carburetion: Keihin 39 mm FCR w/ Throttle Position Sensor,
2009-2011 Yamaha Fuel Injection(YFI), 42mm
- Ignition: DC - CDI
- Starting System: Electric
- Transmission: 5-Speed Manual Clutch
- Drive Train: 2WD; Sealed O-Ring Chain
[edit] Chassis
- Suspension: Front: Independent Double Wishbone, 9.1” w/ Rebound, Compression and Threaded Preload Adjustment
- Suspension: Rear: Cast Aluminum Swing Arm, 10.1” w/ Rebound, Compression and Threaded Preload Adjustment
- Brakes: Front: Dual Hydraulic Disc, Twin Piston
- Brakes: Rear: Hydraulic Disc
- Tires: Front: AT21 x 7-10 Radial
- Tires: Rear: AT20 x 10-9 Radial
[edit] Dimensions
- Length x Width x Height: 72.4” x 46.1” x 42.9”
- Seat Height: 31.5”
- Wheelbase: 50.4”
- Ground Clearance: 4.4”
- Fuel Capacity: 2.6 Gallons
- Dry Weight YFZ 450: 350 Pounds
- Wet weight YFZ 450: 378 lbs
- Wet weight YFZ 450r: 405 lbs
- Wet weight YFZ 450x: 400 lbs
[edit] Other
- Lighting: Dual 30W Krypton Multi-reflector Headlights & 21/5W Brake light
- Colors: Team Yamaha Blue/White; White/gray; Yellow/Black (Special Edition)
- Warranty: 6 Month (Limited Factory Warranty)
