two-stroke

adjective

relating to or designating an internal-combustion engine whose piston makes two strokes for every explosionUS and Canadian word: two-cycle Compare four-stroke

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for two-stroke

Historical Examples of two-stroke

A 3-cylinder two-stroke cycle engine therefore has the same capacity to do work as a 6-cylinder four-stroke cycle engine.
The First Airplane Diesel Engine: Packard Model DR-980 of 1928
Robert B. Meyer
This style of motorcycle has a smaller motor, which is usually of the two-stroke type, single cylinder.
The Wonder Book of Knowledge
Various