YAMAHA YZF-R1 engine TechnicaL Specification

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The 2006 model runs with the same 998 cc liquid-cooled 4-stroke DOHC 4-cylinder 5-valve layout featuring a 77 x 53.6 mm bore and stroke and 12.4:1 compression ratio. Equipped with a 3-axis transmission, fuel injection and 40 degree forward slanted cylinders, this ultra-compact powerplant is one of the most highly respected supersport engines of all time. Yamaha’s engineers have conducted a thorough examination of the R1′s intake and exhaust efficiency, and for 2006 a range of detailed changes in this area have achieved a 3 Hp increase in power at 12,500 rpm without direct air induction. One of the most significant changes is the use of shorter intake valve guides for 2006. Measuring 27.5 mm, these new guides are 5 mm shorter than the 2005 model, and this 15% reduction in length increases engine efficiency by increasing intake air flow, and reducing frictional power losses. To match the new intake valve guides, the 2006 model also features smoother intake ports. Furthermore, the clutch boss has been modified to increase the oil flow to the clutch assembly. other detail changes The design of the compact cam chain tensioner has been revised, and now features a different sealing system for improved durability. The overall length of the main gear axle is increased by 5 mm, and the engine cover is modified accordingly. engine TechnicaL highLighTS n 998 cc liquid-cooled 4-stroke DOHC 4-cylinder 5-valve n 3 hp power increase to 175 Hp @ 12,500 rpm* n 40 degree forward incline cylinder n Fuel injection n Ultra compact 3-axis transmission n 77 x 53.6 mm bore and stroke n 12.4:1 compression ratio n New smoother intake port design n New shorter intake valve guides n Higher intake and exhaust efficiency n Modified cam chain tensioner n Redesigned clutch boss * Without direct air induction
chaSSiS The R1′s Deltabox V chassis has been developed with the benefit of ongoing structural analysis and repeated testing, all the time using input from our highly successful MotoGp race programme. For 2006 the R1′s class-leading aluminium Deltabox V frame remains externally similar to the existing model, but beneath the skin some subtle yet significant changes have taken place

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