Yamaha SZR660

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Yamaha SZR660
Manufacturer Yamaha
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)

Yamaha SZR660 is a sport bike with a 659 cc single-cylinder engine, produced by Yamaha Motor Corporation from 1996 to 2001. It was built in Italy by the Italian Yamaha importer Belgarda. 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.

A vacuum operated fuel pump is mounted on the bottom of the fuel tank, 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.