Yamaha is finally introducing an all-new snowmobile that can rival any segment competitor. Thanks to a radical new approach, the Japanese manufacturer claims that the new Nytro is light-years ahead of its predecessor. It targets customers after a powerful and nimble machine to tackle the roughest, most gruelling trails in the land.


Major engine revisions
The Nytro is motivated by a significantly revised version of the 3-cylinder Genesis 120 engine. In order to get the desired displacement, Yamaha engineers slightly increased its bore. Meanwhile, the stroke remains identical to preserve all the abilities of the old model at higher revs. Displacement was determined based on snowcross racing regulations. On January 14, 2007, the FX Nytro actually became the first 4-stroke snowmobile to win one of these highly competitive races. Although larger in size, the new powerplant weighs 5 kilograms less. How is that possible? Designers simply lightened and slimmed the crankshaft, camshafts and valve pushrods.

The engine benefits from an electronic fuel injection system with three 41-mm Mikuni throttle bodies. Yamaha saw fit to retain the balance shaft and electric start system to make everyday riding as enjoyable as always. While the performance of Yamaha's 4-stroke engines has never been questioned, you'll be thrilled to know that the Nytro should surpass the performance of 600-cc, 2-stroke engines. Engineers also claim that this new snowmobile will be more fuel-efficient than the 2008 Phazer since there is no reduction gear system. Therefore, lower engine revs are required to reach the same speed. What's more, it runs on regular gasoline.

A true snowcross
In terms of ergonomics, the new Nytro has virtually nothing in common with the previous model. The rider sits a bit higher and closer to the front, enjoying a more aggressive position than what the Deltabox II chassis allowed. This sportier yet comfortable stance definitely improves the riding experience on super bumpy trails.