Development of All Position-Operatable Small Four-stroke Engine

A small four-stroke engine capable of all positional operation has been developed. The engine for hand held equipment provides easy maneuverability like two-stroke engines which are dominated in the small engine market. The developed technologies include the following items.

1. ①
   360° all positional operation by adopting a new lubrication system.
2. ②
   Light-weight with a thin uni-block cylinder, etc.
3. ③
   Normal operation at more than 10,000 rpm and at low and medium revolution range are combined by high output with a wide torque band.

Equally easy handling and better workability compared with the conventional two-stroke engines are achieved. In addition, better starting reliability, drastically improved emission, and half-reduction of running costs are also confirmed.