In 1995 Honda re-entered the Paris-Dakar with a bang. The EXP-2 was a radically new and different motorbike, equipped with a revolutionary 400ccm two-stroke engine. After two weeks of racing the african dessert Jean Brucy finished 5th overall and first place in the under-500ccm class.
The EXP-2 was designed to inrease fuel economy, drastically reduce emissions and improve torque characteristics over existing two-strokes. The ARC termed system (Activated Radical Combustion) featured fuel injection and a variable exhaust valve which produced controlled auto-ignition at low to medium throttle settings (at high throttle settings the ignition was controlled by a spark plug). The effect was a thoroughly combustion at low revolutions, whereas in a conventional two-stroke engine unburnt gases would escape into the atmosphere.
A linear and wide powerband was the result, giving the EXP-2 a similar performance to its four-stroke competitors – but a substantially better fuel economy and lower emissions. By increasing the mileage of the bike, it could be raced carrying less fuel, which improved handling and decreased rider fatigue.
Track record of the EXP-2:
The Honda EXP-2 is located on the third floor of the Honda Collection Hall.
More Honda Motocross and Enduro motorcycles at the Honda Collection Hall: http://www.honda-museum.com/motocross-enduro/