Yamaha has been secretive about the 2010 Yamaha YZ450F, but it looks like the wait was worth it. The 2010 Yamaha YZ450F looks ready for dirt and we are looking forward to doing a full-test very soon. Amazing suspension revisement. Genius. They put all the right things in the right places. Cant wait to see what these things are going to be like to work on. Shorter stroke? Larger 4 valve instead of 5. WHHHEEEW. Hope the injection system is tits. Sign me up for the whitey.A new aluminum frame and swingarm are used, with the main frame constructed out of sixteen different pieces of aluminum designed to provide optimum rigidity and feel. The entire rear suspension was reengineered in order to keep the rear shock in the center of the machine, a position previously used by the airbox (now repositioned to the front of the motorcycle). Reworked triple clamps hold last year’s ultra-plush Kayaba Speed Sensitive fork and reduce offset down to 22mm (from 25mm). The fork also benefits from 10mm longer suspension stroke, updated damping characteristics and still offers both compression and rebound damping adjustment. What has taken so long for someone else to finally reverse the freaken cylinder head. Cannondale and now ATK has been doing it for years. It makes total sense so what's taking so long. It look's like Yamaha took the best of the cannondale of yesteryears and the husaberg of today to make one beautiful. Hopefully we will see these changes on the WR. Then you will have my check! 
Engine
This cut-out shows the new 1.6 gal. fuel tank, relocated for 2010 on the YZ450F to underseatFor 2010 the YZ450F’s engine employs revolutionary new ideas we’ve never seen on a Japanese motocross bike. The first thing you’ll notice, besides its sharp new angular bodywork, is the way the 449cc liquid-cooled Single is positioned in the frame. It’s canted rearward for two reasons. First to exploit combustion force and second to keep the bikes reciprocating mass as centered and low as possible. You’ll also notice that the exhaust now exits from the rear of the engine. This was done in order to maximize the engine’s intake and exhaust efficiency by offering a direct path for both fuel and exhaust to flow through the engine.
The bike’s air intake system has been relocated to the front of the bike underneath the fuel tank just like on Yamaha’s YZF-line of sportbikes. A 12-hole fuel-injector shoots fuel into the 44mm Keihin throttle body attached to the front of the engine. It’s powered by a battery-less high input generator that is powered as soon as the kick start is touched.
The cylinder utilizes a bigger bore, shorter stroke format (97.0 x 60.8mm) with a higher compression ratio (12.5:1). A new 4-valve cylinder head replaces last year’s 5-valve component, and, in conjunction with the shorter piston stroke reduces the overall height of the engine. A new “tornado” exhaust system snakes trough the rear of the bike and is designed to complement the new engine’s power characteristics. The 5-speed transmission and cable-actuated wet clutch has also been updated for improved feel and shifting performance
2010 Yamaha YZ450F Specs
Engine: 449cc Liquid-cooled 4-Stroke Single; 4-valve
Bore and Stroke: 97.0 x 60.8mm
Compression Ratio: 12.5:1
Fuel Delivery: Fuel-injection
Transmission: 5-speed; cable actuation
Front Suspension: Kayaba Speed Sensitive; 2 way-adjustable for compression and rebound damping; 12.2 in travel
Rear Suspension: Kayaba gas charged shock absorber; 4-way adjustable for preload, high/low-speed compression, and rebound damping; 12.4 in. travel
Front Brake: 250mm disc with twin piston caliper
Rear Brake: 245mm disc with single piston caliper
Tires: 80/100-21 Dunlop D742FA, 120/70-19 D756
Seat Height: 39.3 in.
Ground Clearance: 15.0 in.
Fuel Capacity: 245 lbs.
Color: Team Yamaha Blue/White; White Red
Warranty: 30-days <>
Engine
This cut-out shows the new 1.6 gal. fuel tank, relocated for 2010 on the YZ450F to underseatFor 2010 the YZ450F’s engine employs revolutionary new ideas we’ve never seen on a Japanese motocross bike. The first thing you’ll notice, besides its sharp new angular bodywork, is the way the 449cc liquid-cooled Single is positioned in the frame. It’s canted rearward for two reasons. First to exploit combustion force and second to keep the bikes reciprocating mass as centered and low as possible. You’ll also notice that the exhaust now exits from the rear of the engine. This was done in order to maximize the engine’s intake and exhaust efficiency by offering a direct path for both fuel and exhaust to flow through the engine.
The bike’s air intake system has been relocated to the front of the bike underneath the fuel tank just like on Yamaha’s YZF-line of sportbikes. A 12-hole fuel-injector shoots fuel into the 44mm Keihin throttle body attached to the front of the engine. It’s powered by a battery-less high input generator that is powered as soon as the kick start is touched.
The cylinder utilizes a bigger bore, shorter stroke format (97.0 x 60.8mm) with a higher compression ratio (12.5:1). A new 4-valve cylinder head replaces last year’s 5-valve component, and, in conjunction with the shorter piston stroke reduces the overall height of the engine. A new “tornado” exhaust system snakes trough the rear of the bike and is designed to complement the new engine’s power characteristics. The 5-speed transmission and cable-actuated wet clutch has also been updated for improved feel and shifting performance
2010 Yamaha YZ450F Specs
Engine: 449cc Liquid-cooled 4-Stroke Single; 4-valve
Bore and Stroke: 97.0 x 60.8mm
Compression Ratio: 12.5:1
Fuel Delivery: Fuel-injection
Transmission: 5-speed; cable actuation
Front Suspension: Kayaba Speed Sensitive; 2 way-adjustable for compression and rebound damping; 12.2 in travel
Rear Suspension: Kayaba gas charged shock absorber; 4-way adjustable for preload, high/low-speed compression, and rebound damping; 12.4 in. travel
Front Brake: 250mm disc with twin piston caliper
Rear Brake: 245mm disc with single piston caliper
Tires: 80/100-21 Dunlop D742FA, 120/70-19 D756
Seat Height: 39.3 in.
Ground Clearance: 15.0 in.
Fuel Capacity: 245 lbs.
Color: Team Yamaha Blue/White; White Red
Warranty: 30-days <>
Source Motorcycle-usa,com
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