It evolved from the popular NS250R MC11 and was produced over four distinct generations, each powered by liquid-cooled, reed valve inducted 249cc 90° V-twin two stroke engines. All engines incorporated the Honda RC-Valve power valve system, and nikasil-sulfur lined cylinder bores (hence the 'NS' in 'NSR').
The road going NSRs were built in the image of the Honda RS250R (also known as the NSR250) production race motorcycle series, although they shared no mechanical parts. This was in the style of competing factories Yamaha and Aprilia.
The engine is a 249cc 90° V-twin liquid-cooled two-stroke with crankcase reed valve induction via twin naturally aspirated carburetors.
Bore and Stroke: 54mm × 54.5mm
The gearbox is a six-speed constant mesh cassette type with multi-plate wet clutch.
MC18 R6k
The engine is the same as the R5k. The only difference is that it has a dry multi-plate clutch.
Suspension
MC18 R5k
Front: Twin telescopic forks. Oil-filled damper with spring preload adjustment only.
Rear: Single rising rate shock. Pro-Link with external coil. Variable spring preload adjustment only.
MC18 R6k
Front: Twin telescopic forks. Oil-filled damper cartridge with spring preload and rebound damping adjustment.
Rear: Single rising rate rear shock. Pro-Link with external coil. Gas/oil damper with variable spring preload. Rebound and compression damping adjustment.
