Yamaha YDS-7 Yamaha

YDS-7, 1972 Yamaha YDS-7 In the evolving line of Yamaha two-strokes, the YDS7 of 1971 is notable as the one in which the till-then popular rounded look was replaced by a more angular line, at the same time becoming slimmer, lower and lighter. Peak power of the YDS7 was set at 7,500rpm which, with top (fifth) gear engaged, came up very easily, the bike being a trifle undergeared, and worked out to a road speed of 90mph. A small rider, crouched, could extract a further 5mph with no great difficulty. Steering geometry (62.5° castor, 4.2 in trail) to give a fast response made the bike very diverting transport on winding roads; 30bhp, combined with the effect of a short wheelbase (54in) and low weight (300lb), would keep the front wheel in only light contact with the tarmac. For this model Yamaha introduced an 'excited field' generator for ignition purposes, which worked well and emitted an eerie whistle as the ignition key was first operated and the system set itself up. In this connection, a more… Read more

Vitals

  • Make Model
    Yamaha YDS-7
  • Year
    1972
  • Engine
    Air-cooled, two stroke, piston-port, parallel twin
  • Capacity
    247
  • Bore x Stroke
    54 x 54 mm
  • Compression Ratio
  • Induction
    26mm Mikuni
  • Ignition / Starting
    Mitsubishi contact breaker
  • Clutch
    wet clutch
  • Max Power
    30 hp @7500 rpm
  • Max Torque
    21ftlb @ 7000 rpm
  • Transmission / Drive
    5 Speed / chain
  • Frame
  • Front Suspension
    34mm Telescopic forks
  • Rear Suspension
    Twin shock
  • Front Brakes
    180mm twin leading shoe drum
  • Rear Brakes
    180mm single leading shoe
  • Front Tyre
    300 x 18
  • Rear Tyre
    3.25 x 18
  • Wheelbase
    1300 mm
  • Wet-Weight
    143kg
  • Fuel Capacity
    12 Litres

Videos

VINTAGE 1972 YAMAHA YDS7 250cc

Yamaha yds7

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