noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder.
The engine shall be four-cycle diesel of the manufacturer's standard design with proven reliability in service.
Currently, the snowmobiles use four-cycle engines that produce far less pollution than the two-cycle engines that were once used.
British Dictionary definitions for four-cycle
(US & Canadian) relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion Equivalent term (in Britain and certain other countries) four-stroke Compare two-stroke