The JASO standards set the classification for motorcycle engines, both Japanese automotive diesel engines.
--stroke and
_-stroke, as well as

two; four; Japanese automotive diesel engines.

Explanation:

Japanese Automotive Standards Organization (JASO) is a standardized organization saddled with the responsibility of setting automotive standards in Japan, just like the Society of Automotive Engineers (SAE) that sets automotive standards in the United States of America.

The Japanese Automotive Standards Organization (JASO) standards set the classification for motorcycle engines, both two-stroke and four-stroke, as well as Japanese automotive diesel engines. The JASO T 903:2011 was developed in October 2011 for the four-cycle motorcycle engine while having different ratings for dry clutch (MB) and wet clutch (MA). Also, JASO M 35:2003 was developed in October 2003 for two-strokes motorcycle engine.

Lastly, JASO M355:2015 was developed in October 2015.