The Aprilia RS 660 on the other hand is more powerful at 87 horsepower at around 10,000 rpm. Looking at the power and torque figures at the rear wheel Yamaha R7 is a fair bit closer to the RS 660, producing an impressive 70 horsepower between 8,500 rpm and 9,500 rpm and 47 ft/lb of torque. The 25 horsepower advantage to the RS 660 might be alarming to Yamaha fans but is not quite so clear cut as the on-paper numbers would suggest. The R7 does not look as impressive on paper with a claimed 74.8 horsepower 9000 rpm and 50 ft/lb at 6500 rpm. If we look at claimed figures the Aprilia RS 660 has a claimed output at the crank of 100 horsepower at 10,500 rpm and 49.5 ft/lbs of torque at 8,500 rpm. Other engine internals aside, what the above suggests is that Aprilia are chasing power and higher rpm for their RS 660, while Yamaha were looking at a torquey and more flexible engine as their goal for their R7. Yamaha’s YZF-R7 on the other hand is a lower compression engine at 11.5:1 and has a longer stoke and slightly narrower bore coming in at 80.0 x 68.6 mm. That is where the similarities end as both manufacturers have opted for very different target power outputs and how and where that power is delivered.Īprilia’s RS 660 is a relatively high compression engine at 13.5:1 with an 81 x 63.83 mm bore and stroke that is conducive to higher rrm and power. The Aprilia RS 660 is the smaller of the two at 659 cc while the Yamaha YZF-R7 comes in at 689 cc Twins that use the more conventional crank layout.
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