| Manufacturer | Yamaha Motor Company |
|---|---|
| Also called | Star Roadliner (US) Star Stratoliner (US) Yamaha Midnight Star (UK) |
| Production | since 2006 |
| Class | Cruiser |
| Engine | 1,854 cc (113.1 cu in) 4-stroke air-cooled V-twin |
| Bore / Stroke | 100 × 118 mm (3.9 × 4.6 in) |
| Compression ratio | 9.5:1 |
| Power | 89.04 hp (66.40 kW) @ 8,500 rpm |
| Torque | 155.10 N·m (114.40 ft·lbf) @ 6100 rpm |
| Transmission | 5-speed gearbox to belt drive |
| Frame type | Aluminium double cradle |
| Suspension | Telescopic forks front, rear swingarm (Link-type monocross suspension) |
| Brakes | 298 mm (11.7 in) double disc front, single rear |
| Wheelbase | 1,715 mm (67.5 in) |
| Dimensions | L 2,580 mm (102 in) W 1,100 mm (43 in) H 1,125 mm (44.3 in) |
| Seat height | 705 mm (27.8 in) |
| Weight | 329 kg (730 lb)[1] (dry) |
| Fuel capacity | 17 litres (3.7 imp gal; 4.5 US gal)[1] |
The Yamaha XV1900A is a motorcycle manufactured by the Yamaha Motor Company and sold in the United States through Yamaha's Star Motorcycles division. It is the largest Yamaha V-twin motorcycle in production.[2]
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The Yamaha XV1900A cruiser was developed to exploit the high capacity end of the market for large cruisers. Yamaha had a well established range of big "Star" cruisers which went up to the Yamaha Wild Star 1600 cc but there was a need to redesign the engine to meet anticipated exhaust emissions regulations and the opportunity to update the styling, which had remained largely unchanged for a decade.[2]
The 1,854 cc (113.1 cubic inches) four-stroke air-cooled V-twin engine was purpose built to deliver maximum torque at 2,500 rpm in the 55 to 75 mph (90 to 120 km/h) range used for motorcycle cruising. Set at 48 degrees, the cylinders have a four pushrod valves, twin spark plug cylinder heads,[3] with 100 mm (3.9 in) diameter plated forged pistons.[2]
With a 100 mm (3.9 in) bore and a stroke of 118 mm (4.6 in), the engine has a compression ratio of 9.5:1 and is the first Yamaha cruiser motorcycle to be equipped with the compact Exhaust Ultimate Power Valve (EXUP) 4-stroke power valve system previously only found on their range of high performance sports motorcycles.[2]
An unusual feature of the new engine is a special 'pent roof' combustion chamber, designed to increase the efficiency of gas flow. The engine also has special balancers on both sides to reduce the vibration typical of large V-Twins.[4]
The engine’s output is transmitted via a wide-ratio five-speed gearbox and compact new transfer case, with power delivery controlled by a hydraulic clutch featuring a four-step adjustable lever. For quiet operation together with low maintenance requirements, the Midnight Star is equipped with a belt drive system.[2]
A lightweight long wheelbase (1,715 mm/67.5 in) frame was designed using aluminium die casting to minimise weight, with a double cradle design to provide the strength. Suspension consists of a die cast aluminium swinging arm and a hidden single horizontal rear shock absorber and large diameter front forks.[2]
In 2010, a custom version was produced in limited numbers featuring a lowered seat, lengthened front forks, a wider 210 mm rear tyre, the widest on any Yamaha motorcycle,[5] and special black finish to the engine and a range of custom fittings.[3]
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