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2010 Yamaha YFZ450X

Posted in Vehicle Reviews on July 1, 2010
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Photographers: Yamaha Motor Corp.

If you've been drooling over Yamaha's new track-friendly YFZ450R, but you wish it was narrower and had features geared for riding or racing on tight trails, Yamaha has granted your wish with the new YFZ450X.

The narrower, lighter YFZ450X is available in three color schemes, including the white shown here.

What's different about the X model? Well, it's narrower than the R model by 2.7 inches; it has a newly designed front suspension; new steering geometry; a lighter rear axle; and lighter, but structurally more rigid wheels.

To delve into more detail, the X suspension is similar to the R in that up front, there's an independent double wishbone with fully adjustable KYB piggyback-reservoir coilover shocks and in the rear there's a cast aluminum swingarm with fully adjustable KYB piggyback-reservoir coilover shock. The X, however, has shorter A-arms and shorter shocks up front. Yamaha says all of these things allow the X to soak up bumps while also allowing the rider great handling through tight, technical terrain.

Up front, there's an independent suspension with KYB piggyback-reservoir coilover shocks.

Powering the X is the same potent engine that's found in the R model. It's a five-titanium -valve, DOHC, liquid-cooled, single-cylinder 449cc engine that uses the cylinder and head from the championship-winning YZ450F motorcycle. The camshafts are designed just for ATVs, they hammer out superior low- to mid-range torque, and they push through to a high-revving top end. The engine is also equipped with electronic fuel injection featuring a 42mm Mikuni throttle body, 12-hole Denso injector system and a Mitsubishi 32-bit ECU. This EFI system has been tweaked for the X model and features a setting specifically designed for those situations unique to technical woods riding.

Like the R model, the X has the Yamaha-exclusive lightweight no-weld cast aluminum frame; a five-speed transmission; chain drive; dual vented disc front brakes with two-piston calipers; wave-style ventilated hydraulic rear brake with two-piston caliper; and Pro Taper handlebars with four-position adjustability.

Also like its brother, the X model has an instrument panel located on the fender in front of the rider and it has indicators signaling low fuel, coolant temperature, check engine, and neutral gear in a straightforward LED display. There's also a thin yet roomy seat with more padding in the back for a more comfortable ride and there's large, wide footpegs with kick-ups that provide maximum traction and added comfort when moving around on the machine.

So there you have it. The new YFZ450X is Yamaha's response to those wishing for a narrower, trail-friendly version of the incredible YFZ450R.

Vehicle model: 2010 Yamaha YFZ450X
Base price: $8499
Colors: Team Yamaha Blue/White, White/Red

Type: Single-cylinder DOHC four-stroke, liquid-cooled w/fan
Displacement (cc): 449
Bore and stroke (mm): 95 x 63.4

Transmission: 5-speed manual clutch
Final drive: Chain

Front: Independent double-wishbone, Kashima-coated piggyback shocks, high/low speed compression, rebound and threaded preload adjustments, 9.4 inches of travel
Rear: Cast aluminum swing arm, piggyback high/low speed compression, rebound and threaded preload adjustment, 11.0 inches of travel

Front: Dual ventilated hydraulic discs, twin-piston calipers
Rear: Wave-style ventilated hydraulic disc, twin-piston caliper

Front: AT21x7-10 Radial Rear: AT20x10-9 Radial
Weight (lb): 400
Length (in): 70.7
Width (in): 46.1
Height (in): 41.9
Seat height (in): 31.9
Ground Clearance (in): 4.5
Fuel capacity (gal): 2.6
Wheelbase (in): 50.0


Yamaha Motor Corp.
Cypress, CA

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