| 词条 | Yamaha XV1900A |
| 释义 |
| name = Yamaha XV1900A | image = | aka= Star Roadliner (US) Star Stratoliner (US touring version) Yamaha Midnight Star (UK) | manufacturer = Yamaha Motor Company | production = since 2006 | predecessor = | successor = | parent_company = | class = Cruiser | platform = | engine = {{convert|1854|cc|cuin|abbr=on}} 4-stroke air-cooled V-twin | bore_stroke= 100mm x 118mm (3.937 in x 4.646 in) | compression= 9.5:1 | top_speed = | transmission = 5-speed gearbox to belt drive | power = {{convert|81.8|hp|abbr=on}} @ 4,400 rpm (rear wheel)[1] | torque = {{convert|103.5|lbft|abbr=on}} @ 2200 rpm (rear wheel)[1] | suspension = Telescopic forks front, rear swingarm (Link-type monocross suspension) | frame = Aluminium double cradle | brakes = {{convert|298|mm|abbr=on}} double disc front, single rear | rake = | trail = | wheelbase = {{convert|1715|mm|abbr=on}} | length = {{convert|2580|mm|abbr=on}} | width = {{convert|1100|mm|abbr=on}} | height= {{convert|1125|mm|abbr=on}} | seat_height = {{convert|705|mm|abbr=on}} | dry_weight = {{convert|329|kg|abbr=on}}[3] | wet_weight = | fuel_economy = | fuel_capacity = {{convert|17|L}}[2] | related = }} 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 motorcycle in production.[5] DevelopmentThe Yamaha XV1900A cruiser was developed to exploit the large displacement end of the market for large cruisers. Yamaha had a well established range of big "Star" cruisers which went up to the 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.[3] EngineThe {{convert|1854|cc|cuin|abbr=in}} four-stroke air-cooled V-twin engine was purpose-built to deliver maximum torque at 2,500 rpm in the {{convert|55|to|75|mph|-1|abbr=on}} range used for motorcycle cruising. Set at 48 degrees, the cylinders have a four pushrod valves, twin spark plug cylinder heads,[4] with forged pistons having an Alumite coating to reduce friction and ceramic-composite-coated cylinders.[3] With an undersquare bore and stroke of 100mm (3.937 in) x 118mm (4.646 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) four-stroke power valve system previously only found on their line of high performance sports motorcycles.[3] 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 counter-rotating balancers on both ends of the crankshaft to reduce the vibration typical of large V-Twins.[5] TransmissionThe 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.[3] FrameA lightweight long wheelbase ({{convert|1715|mm|disp=or|abbr=on}}) frame was designed using aluminum die casting to minimize weight, with a double cradle design to provide the strength. Suspension consists of a die cast aluminum swinging arm and a hidden single horizontal rear shock absorber and large diameter front forks.[3] Raider versionStarting in 2008, 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,[6] and special black finish to the engine and a range of custom fittings.[4] See also
References1. ^1 {{cite web |url=http://www.motorcycle.com/manufacturer/star/2014-star-roadliner-s-review.html|last=Roderick |first=Tom |title=2014 Star Roadliner S Review| publisher=Motorcycle.com|accessdate=June 8, 2017|date=September 17, 2013 }} 2. ^1 {{cite web | url= http://www.motorcyclenews.com/MCN/bikereviews/searchresults/Bike-Reviews/Yamaha/Yamaha-XV1900-2006-current/ | publisher= Motorcycle News | title= Yamaha XV1900 (2006-current) | accessdate=4 October 2010}} 3. ^1 2 3 4 5 {{cite web|url=http://www.bikersweb.co.uk/Features/BikeReviews.aspx?ArticleId=131|title=XV1900 Midnight Star|accessdate=23 September 2010}} 4. ^1 {{cite web|url=http://www.totalmotorcycle.com/photos/2010models/2010-Yamaha-Raider-XV1900.htm|title=Yamaha Raider XV1900|accessdate=23 September 2010}} 5. ^{{cite web|url=http://www.yamaha-motor.co.uk/uk/products/motorcycles/cruiser/xv1900a-midnight-star.aspx?view=features|title=XV1900A Midnight Star|accessdate=23 September 2010}} 6. ^{{cite web|url=http://www.moto123.com/motorcycle-reviews/article,2008-yamaha-xv1900-custom-s-road-test.spy?artid=92767|title=2008 Yamaha XV1900 Custom S Road Test|last=Bastien|first=Pascal|date=2007-10-29|accessdate=23 September 2010}} External links{{commons category|Yamaha XV1900}}
3 : Cruiser motorcycles|Yamaha motorcycles|Motorcycles introduced in 2006 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。