Yamaha RD48

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The Yamaha RD48 was a two stroke 250cc Grand Prix racing motorcycle. It had two 56x50mm cylinders, disk valves and an Oldham coupler joining the crank shafts. Weight was 100kg and power 35bhp.[1]

It was ridden by Tanahara Noguchi and Fumio Ito in Yamaha's first GP on Sunday, 21st May 1961, the French GP. Ito achieved 8th place and at the end of the 1961 season was 9th in the championship.

The engine was improved for the 1962 season generating a claimed 42bhp at 10,000 rpm, however only the Singapore GP was entered.[2]

Yamaha RD48
ManufacturerYamaha Motor Company
Production1961 - 1962
PredecessorYamaha YD1
SuccessorYamaha RD56
Engine250cc two-stroke


  1. p18 MacKellar.
  2. p21 MacKellar


MacKellar, Colin (28 Aug 1995). Yamaha: All Factory and Production Road-Racing Two-Strokes from 1955 to 1993. UK: The Crowood Press Ltd. pp. 191. ISBN 1852239204.