Yamaha SZR660 is a sport bike with a 659 cc single-cylinder engine, produced byYamaha Motor Corporation from 1996 to 2001. It shares engine with Yamaha's XTZ660 Ténéré line of dual-purpose on/off road motorcycles, but employs this engine within a Supermono package.
The 660 engine incorporates a five valve cylinder head. There are three intake and two exhaust valves. The theory is that the smaller valves have a larger area at a lower weight than a four valve system and allow maximum intake flow and velocity.
The fuel tank incorporates an inbuilt fuel pump, to lift the contents of the tank to the twin carburettors. The fuel system incorporates one slide carb and one butterfly carb. These are operated sequentially by a manually adjustable system.
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| Manufacturer | Yamaha |
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| Production | 1996-2001 |
| Class | Sport bike |
| Engine | 659 cc, four-stroke, SOHC, liquid cooled, 5 valves, single cylinder |
| Dimensions | L 2040 mm (80.3 in) W 740 mm (29.1 in) H 1140 mm (44.8 in) |
| Seat height | 770 mm (30.3 in) |
| Weight | 159 kg (350 lb) (dry) |
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