Yamaha YZF

The bike performed and sold well, and was dominant in Supersport racing, but by '04 it already seemed long in the tooth. So this year, Yamaha introduced a bike that's more than a tweak but less than a complete redesign. It almost seems the tuning forkers have placed function ahead of form, as the new R6 gets a new, fully adjustable inverted fork and radial front brakes, but not the underseat exhaust that's so du jour. Indeed, the bodywork's virtually identical to that of last year's bike.

There are three more horses in harness, Yamaha says, despite the fact engine internals are unchanged from last year. Tuning the fuel injectors (now with 12 holes for better atomization), the ECU and the throttle bodies (now 40mm wide with adjusted stack heights) accounts for the difference.

Yamaha admits the mods are track-focused. Its rivals have gone even further, homologating bikes with slipper clutches, dual-stage injectors, eccentric swingarm pivots, titanium valves and the like. So it remains to be seen whether Yamaha has gone far enough to win in 600 Supersport. But one thing's for certain. On real roads, the 2005 R6's subtle changes pay big dividends in control and confidence.

Changes begin with the inverted fork and radial brakes, which necessitated stiffening the steering head and swingarm pivot areas to handle the added braking and cornering loads. The new front tire and fork adds half a degree of rake and a smidgen of trail. Both changes add stability. Although the new brake rotors are larger, they're also thinner for a net decrease in gyroscopic effect, Yamaha claims. Handlebar positioning has been subtly changed for increased leverage. The net effect is nothing short of brilliant. On street tires (R6s come shod with Dunlop 218s) the bike steers quickly yet feels dead stable despite the absence of a steering damper.

The brakes are excellent; strong and easy to modulate when trail-braking. Scrubbing a little speed or modifying cornering lines--even at big speeds on fully inflated street rubber--is stress-free. Then there's that brilliant bump-absorption ability. Ergos are not perceptibly different from last year's bike. It feels tiny. The seat is relatively low and narrow (even our 5-foot-7 tester could put both feet flat on the ground). The footpegs feel low, though I never dragged them. The bars feel low, too, though they're mounted above the upper clamp. You sit on--not in--this bike. The light-action clutch and reasonable torque from 5000 rpm help make the R6 a surprisingly practical vehicle. On standard suspension settings the ride is firm, but it takes the edge off most inner-city asphalt nasties.

Away from traffic and neighbors with sensitive hearing, the motor will spin to more than 15 grand, but there's no need to wring the R6's neck. Any time the tach needle's roughly vertical--say in the 10,000-12,000-rpm range--you can short-shift and stay on the level part of the torque curve. Up top, there are seamless, usable revs for those who want 'em. Real-world bliss.

Despite Yamaha's track-focused comment, the stock R6 is less happy on race rubber. When switched to Dunlop D208 GP-A tires for an afternoon at the track, the added grip was offset by a slight head shake that had even experienced racers queuing up for the shock adjustment tool. The interim solution was to soften shock preload, allowing the rear end to settle a bit and compensate for the taller rear tire. Have fun and ride safe!!!