Vector's engine provides top-end muscle

2005 Yamaha Vector
Broad power band? Full 120 horses? The next best 4-stroke from Yamaha?

These are the questions asked of the new Genesis 120 triple, the muscle behind three 2005 Yami's - the RS Vector, RS Rage and RS Venture.

Recently Dyno Tech Research, an independent dynamometer testing company, tested the RS Vector and pitted the new 120-horsepower machine against three '04 sleds from other manufacturers that compete with the Vector on the horsepower front. The results show that Yamaha didn't fib on its power statements.

Vector is Yamaha's direct response to compete in horsepower and performance with the high-performance 600 twins from Cat, Polaris and Ski-Doo. It's also a way to begin to replace the Venom and Viper. But comparing the new 4-strokes from Yamaha with the 600's is like comparing apples and oranges. They just aren't the same things.

To compete, the unique Yamaha sleds need more than 400 extra cc's, but then you've changed the ball game dramatically. That's a totally different discussion, but it's clear that Yamaha's new Vector is extremely competitive in the 120hp class.

In the dyno test, Vector topped-out at about 8,600 rpm. At 973cc and with 3-cylinders, there's a lot more under the hood on the Vector and the horsepower results show it. It recorded a solid 118.8 hp in an ambient air temperature of 56 degrees and Dyno Tech Research's Jim Czekala was confident that in normal cool winter air the machine would produce a true 120 hp. The test was run with the stock winter jets still in the Keihin carbs.

Looking strictly at the horsepower of the machines that were tested, it's obvious that Vector is superior on the low end and holds steady through the mid-range rpm.

For the most part, Vector's mid-range steadiness is better than the Arctic Cat F-6, the Ski-Doo REV, and Polaris' Pro X 600. Plus, the Vector doesn't fall off in horsepower as much as the 600's on top-end. Not to mention that the Vector performs all this with only about 50% of the fuel intake as the competing sleds.
Bottom Line
If you're looking for solid horsepower with NASCAR speed at the end of your power-band, coupled with great fuel economy, then this is the engine, and sled, for you. Vector's main advantage is its smooth pull that lasts from the time it engages and throughout the power band. At full straightaway blazing speed, there's a negligible drop-off in horsepower. Just keep reading and watching the trails because these new 4-strokes are only getting better!

This story ran in the December 2004 issue of American Snowmobiler magazine
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