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The Genesis 150FI 4-cylinder engine is designed to build high horsepower and keep weight low. It cranks out about eight additional horsepower over its forebear, the Genesis Extreme™, to hit 150hp class performance. It also weighs 7 pounds less than the Genesis Extreme. The engine’s high-tech fuel injection system also delivers quick, crisp throttle response and as a bonus it runs significantly cleaner than most snowmobile engines on the market today.
Fuel injection system
More than just a bolt-on part of the Genesis 150FI, the fuel injection system required a full engine redesign. The low-pressure system uses an injector and butterfly valve throttle body to aid in delivering outrageously crisp throttle response, 150 horsepower production and class-leading fuel economy.
Rear-exiting 4-2-1-2 titanium exhaust
The exhaust pipes coming out of the Genesis 150FI engine are configured in a 4-2-1-2 design. The exhaust, featuring titanium head pipes, adds to the engine’s higher output and also reduces weight. The patented rear exit design serves many performance-enhancing functions. First, it cools the pipe by running it down the tunnel, where it can be snow-cooled. Second, it reduces the amount of under-hood heat produced. Third, the rear-exiting design distributes weight for a finely balanced sled.
2.2 pound lighter forged crankshaft
The forged crankshaft in the Genesis 150FI is 2.2 pounds lighter than the original crankshaft design in the Genesis Extreme. This is a large contributing factor in the Attak’s razor-sharp throttle response.
In order to generate consistently-strong engine performance in any condition, all Genesis 150FI sleds feature a small radiator and electric fan assembly on the right hand side of the engine cab.
15x136x1.25-inch Camoplast Rip Saw track
The Camoplast Rip Saw track is a standard feature on the Attak. It has been widely acclaimed in the industry as the best all around OEM track for acceleration, cornering bite and everyday trail usage. The Rip Saw track is the result of a collaborative effort between Yamaha and Camoplast.
Second generation front suspension geometry
The geometry of the second generation front suspension features short spindles and long A-arms. The suspension was engineered to deliver excellent cornering stability and consistent turning effort throughout its travel stroke. It delivers 9 inches of vertical travel and sets the skis at 42.7 inches. Steering is consistent, because the spindles are maintained at a constant 23 degrees.
Aluminum HPG front shocks
The High Pressure Gas (HPG) shocks on the Attak’s second generation front suspension geometry deliver consistent performance with excellent fade resistance. They are rebuildable and rechargeable for years of quality service.
Integrated airbox/small hood
The design on the Attak is very efficient, often integrating many functions into one component. One such example is the use of the airbox as a part of the hood design. The upper element, closest to the headlight, is comprised of the silencer cover for the airbox. This design feature allows for a significantly smaller hood piece, which reduces weight.
The Attak features a lightweight magnesium chaincase. The exotic material cuts a pound from the previously used aluminum chaincase on other models.
Lightweight hydraulic brake system
The lightweight 4-piston brake system delivers solid stopping power without fading, even in high-use applications. It also incorporates a lightweight, double-finned, self-cooling brake disc.
Mono Shock™ RA 136 rear suspension
The Mono Shock RA 136 cuts an amazing 12 pounds off of the ProAction™ 136 suspension formerly used on previous models. Like the 121-inch version, the 136 offers riders a full 20 clicks of compression adjustment on the 46mm aluminum HPG shock. The dial is located on the left of the tunnel, near the rider’s leg for easy access from the seat. The Mono Shock RA 136 delivers 11.7 inches of vertical travel.
Deltabox™ II with comfortable rider-forward position ergos
The primary design objective of the Deltabox II chassis was to create a comfortable rider-forward posture. The ergonomic treatment is achieved by moving the handlebars forward by 6 inches and raising them by 4 inches. The seat is also roughly 2.5 inches taller and the seated position is 8.375 inches forward of previous models. With this positioning, the rider can go from sitting to standing and back again easily and comfortably. It also further centralizes the combined mass of sled and driver, for razor-sharp handling.
Wide, hooked handlebars
To match the tall and forward rider position, a tall, hooked handlebar is standard fare on the Attak. The design incorporates keyed slot hooks on both sides to eliminate unwanted hook rotation. The hooks have the same grip material as the main bar section, for more consistent control, regardless of hand position.
Tall, comfort seat
The Attak has a tall, comfortable seat. It has been specifically built for the hard-charging rider who likes to ride aggressively. The seat features the roomy cargo space. The seating position is 6 inches forward and 2.5 inches taller than the conventional seat. The added height of the seat makes it even easier to go from sitting to standing, while the firmer foam provides extra comfort.
Apex-style digital gauge
The Attak features a digital gauge cluster. Readouts include barometric measurements, dual trip meters and a clock! In addition to these functions, the gauge has been styled to match the aggressive lines of the Apex body work.
Standard electric start
Yamaha’s electric starter system allows consumers to fire up their Attak with the turn of a key. There is no pulling on a nylon cord to get this high-tech engine growling! Electric start has been a standard feature on all of Yamaha’s 4-stroke machines.
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