Here is a power and torque graphic for the Genesis 130 FI (fuel-injected three cylinder 1050cc four-stroke) found in the all-new 2008 Yamaha Nytro FX models.
The addition of fuel injection and the increase in displacement yielded a 16-horsepower gain over the Genesis 120 engine it is based on. â€œWe built this engine with an eye squarely on the ISR Stock 600 Class rulesâ€, said Yamaha Snowmobile Product Manager, Adam Sylvester. â€œWe wanted the new engine to be fast-revving and powerful for both competition and for consumers. We got everything we had hoped.â€
Yamaha brought a preproduction Genesis 130FI engine and a full-production Genesis 120 engine to (our old friend Olav Aaen) at Aaen Performance’s dyno testing facility for same-day, back-to-back testing in order to determine the extent of the performance difference.
Peak horsepower figures were 138.6 HP on the FX Nytro and 122.6 HP RS Vector. Both engines showed a very similar curve profile, holding their respective peaks for several hundred rpm.
Torque showed a similar gain, from the carbed 120 to the fuel-injected 130. The Vector engine showed a peak torque figure of 82.9 foot/pounds. The FX Nytro
engine pulled 94 foot/pounds at 7100 rpm. â€œThat kind of torque is near what consumers have found in competitive big-bore 2-stroke engines in the past,â€ said Yamaha Snowmobile Marketing Manager, Rob Powers.
The Genesis 130FI engine also showed a huge gain in torque down in the low end. At 3500 rpm, the new engine posted nearly 72 foot/pounds of torque. That is a 17-point improvement over the Genesis 120 engine. â€œConsumers are going to absolutely love the high torque this engine puts out at clutch engagement,â€ added Sylvester. â€œThe reason is this engine’s amazing low-end grunt.â€
The torque curve is what you feel when you squeeze the throttle. The new fuel-injected triple comes alive quickly and with authority, delivering a wide torque delivery all the way from a grunting 5000 RPM, rising quickly and peaking at about 95 pound-feet of torque at around 6,000 RPM, remaining strong through the entire operating range.