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| 2004 Yamaha YZF-R1 |
Ad ID: 39402 |
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Its heart is a 20-valve 998cc 4-cylinder engine. It's more oversquare in its bore than the previous model and has a higher compression ratio of 12.1:1, as well as longer duration and higher lift cams. It also has Ram Air, which at the upper revs forces more air into the cylinders and produces an additional 7 hp--for 180.
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