The best just keeps getting better. The bike that started the 4-stroke revolution benefits from a host of engine and chassis improvements for 2009. The transmission had been revised, as have the CDI and “shorty” muffler. Even the swingarm and linkages has gone under the microscope for better balanced handlig and reduced weight. The bike that started the trend just keeps on getting better.

Some times it can be the little things that in the end make the difference.

We have changed a number of big items on the ‘09 YZ450F including the transmission and swingarm, but we didn’t forget the little details either. We’ve added more adjustability to the handlebars, redesigned the rear hub. Heck, we even changed the seat and clutch lever. If you are serious about racing … the 2009 YZ450F is the bike for you.

2009 Yamaha YZ450F – USA Specifications
MSRP* $7,399 (Team Yamaha Blue/White) Available from July 2008
$7,499 (White/Red) Available from July 2008

Engine
Type 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves

Bore x Stroke 95.0 x 63.4mm

Compression Ratio 12.3:1

Carburetion Keihin FCR MX39

Ignition CDI

Transmission Constant-mesh 5-speed; multiplate wet clutch

Final Drive Chain Drive

Chassis
Suspension/Front Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel

Suspension/Rear Fully adjustable single shock; 12.3-in travel

Brakes/Front Hydraulic single disc brake, 240mm

Brakes/Rear Hydraulic single disc brake, 245mm

Tires/Front 80/100-21-Dunlop 742FA

Tires/Rear 120/80-19-Dunlop 756

Dimensions
Length 86.4 in

Width 32.5 in

Height 51.4 in

Seat Height 38.9 in

Wheelbase 58.8 in

Ground Clearance 14.7 in

Fuel Capacity 1.8 gal

Wet Weight 238 lb

Other
Warranty 30 Day (Limited Factory Warranty)

Source:  http://www.totalmotorcycle.com/photos/2009models/2009-Yamaha-YZ450F.htm

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