The Yamaha TZR250 is a motorcycle manufactured and produced by the Japanese motorcycle manufacturer Yamaha between 1986 and 1995.[3]
Yamaha produced the road going two-stroke motorcycle, loosely based on the TZ250 Yamaha racing bike. Parallel-twin, reverse cylinder and finally 90° V-twin variants were produced. It evolved as a natural replacement for the popular RD 250/Yamaha RD350LC series of the 1980s. It has the Yamaha Power Valve System 'YPVS' which raises and lowers the exhaust port depending on the rpm of the engine. The YPVS servo motor starts to open at about 6,000rpm. In standard form it produced 45 hp due to the restrictive standard exhausts and ignition boxes.[2]
The TZR250 was still raced in the Yamaha Past Masters race series with the British racing club (BMCRC) as of 2024.[4] Racing engines are currently claiming about 56 hp (42 kW) at 11,000 rpm.[citation needed] Racing fuel ratios typically 1:30. Standard exhausts are difficult to improve on in terms of power and torque, but they are very large and impede ground clearance. Jolly Moto (Italian after market exhaust maker) exhausts are popular replacements as they are lighter, produce similar performance while improving ground clearance.
An F3 racing kit was produced for a few years which included ignition boxes, carbs and exhaust, helping increase maximum revs, power and torque.
Production started in June 1986. At a cost of around $6,000 new on release it was seen as an expensive bike for a 250cc. The parallel twin 2MA variant being the UK variant and the 1KT model being the domestic Japanese model that were also fitted with a more restrictive CDI to comply with Japanese laws which stipulated an upper limit of 45 hp for 250cc motorcycles.[2] Variations between these two models being minimal, e.g. wording on the brake master cylinder in English or Japanese. Lighting arrangements were also different, to comply with UK type approval regulations, particularly the indicators were mounted on stalks rather than faired into the bodywork.
In 1989, the parallel twin reverse cylinder version, 3MA arrived (3MA1). In 1990 the 3MA version received upside-down forks as well as a different shaped expansion chamber for more mid-range power at the expense of a bit of top-end power (3MA3). Then in 1991-1996 the V-twins 3XV.
The 3XV came out in 8 variants with different carbs, ignitions, wet & dry clutches, three versions of power valves, cylinders and each depicted by different colour number boards on the side panels and front fairing. The versions names being 250R; 250RS; 250RSP; 250SP and 250SPR.
The variants closely followed the configuration of motor of the racing TZ250 of the time, sharing the same engine casings, frames and in some models the cylinders, carbs and power valves.
澳門旗幟列表是有關澳門現在或是過去曾經使用過的旗幟列表。 地區代表旗幟 旗幟 日期 用途 設計 敘述 1554年-1616年 葡萄牙王國國旗 藍底色中央加上國徽 曼努埃爾一世旗幟 1578年-1616年 葡萄牙王國国旗 塞巴斯蒂昂旗幟 1616年-1640年 葡萄牙王國國旗 費利佩二世旗幟 1640年-1667年 葡萄牙王國國旗 若昂四世旗幟 1667年-1707年 葡萄牙王國國旗 佩德羅二世旗幟 1707年-1816年1826
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