Yamaha SDR200, 2-stroke Single Cylinder
Speaking of 2-stroke 200cc, Yamaha released SDR in 1987 when racer replicas were the mainstream.
The SDR, with a 195.0㏄ water-cooled case lead single cylinder in the truss frame, was developed as a machine that can enjoy the unique charms of 2-stroke sports such as light maneuverability, exercise performance, and intense acceleration in the regular range.
The SDR, with a 195.0㏄ water-cooled case lead single cylinder in the truss frame, was developed as a machine that can enjoy the unique charms of 2-stroke sports such as light maneuverability, exercise performance, and intense acceleration in the regular range.
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| Yamaha SDR200 2 stroke Single Cylinder |
However, it did not receive much support from a design that was trivial, such as a one-seater.
1987 SDR / 2TV
The body size is total length x width x height: 1945 mm x 680 mm x 1005 mm, almost the same as TZR125.
However, while the TZR125 is a steel delta box frame, the SDR is a truss frame, and even a single seater, so it looks much more compact.
The SDR was short-lived as long as the first generation, but Apple Red and Melting Green first appeared, and later Shiny Black was added, allowing you to choose from a total of three colors.
Is 1987 SDR / 2TV Faster Than TZR
In 1987, at the Yamaha SDR new car launch in Ebisu, the developer said, "It will be faster than the TZR250." I remember that it was lifted that it might be possible with a newly designed 2-stroke single engine of 200cc in a compact body comparable to the 125cc class.
The installed engine is not a DT200R water-cooled piston lead single cylinder, but a TZR125 water-cooled case lead single cylinder scaled up to 195.0㏄ (66 × 57㎜). By mounting it orthogonally Vibration is reduced.
In addition, this engine has YEIS (Yamaha Energy Induction System) that smoothes the intake pulsation, YPVS (Yamaha Power Valve System) that improves exhaust efficiency, and flat valve carburetor that improves response. Input.
The maximum output is 34 ps / 9000 rpm, which is never powerful, but coupled with light weight (the dry weight on the specifications is 105 kg), the power-to-weight ratio is 3.08 kg / ps. According to reference data under development, it is said that it boasted overtaking acceleration performance that exceeded TZR250.
Yamaha SDR200 Parts
The measuring Panel is simple with only a mechanical speedometer (water temperature is based on a warning light), and is designed according to SRX400 / 600, such as an aluminum bracket on which the indicator lamp is mounted. Also, separate handles and front forks with three forks are made of aluminum.
Foot Step, step holders and pedals are also made of aluminum.
The swing arm is also a truss structure made of steel pipe, like the frame, and is supported by a bottom link type monoshock.
The rear brake has an opposed 2-piston caliper, but the disc has a small diameter of φ210mm.
The front brake is a combination of a φ267mm solid disc and an opposed 2-piston caliper.
The frame also has a truss structure that replaces the shape of the delta box with pipework, and TC plating using three elements of nickel, tin, and cobalt is applied. The air cleaner box is made of cast aluminum and is part of the subframe.