Motocyclette Deronzière

This motorcycle, whose design is typical of the era, nevertheless features a rare technical peculiarity.
Indeed, its ignition system does not use a spark plug, but operates via a break-spark mechanism.
Electricity was unreliable at the time, so a low-voltage mechanical system was considered safer.

  • 249 cc single-cylinder 4-stroke engine block (65 x 75 mm), 2.5 HP at 1,800 rpm
  • Blind cylinder
  • Automatic intake
  • Side exhaust
  • Gear train valve distribution
  • Low-voltage mechanical ignition
  • Direct belt drive transmission
  • Front suspension by Max Bandoni with wheel push system
  • No rear suspension
  • Speed: 40 km/h