i go to kohler, echo ,kawasaki,briggs,tecumseh,stihl engine schools
every year. ive been hearing there will be cat converters and fuel
injection on small engines since 1993. kohler has a gas engine with fuel
injection but customers dont want it. lawn boy 2 strokes are no longer
to be made as of this year and that all 2 strokes will be history in the
next 10-15 years ........ i will say that 4 stroke small engines have
been improved on vastly over the last ten years as far as polluting
less, due mostly to improved carb and intakes and overhead valves and
electronic ignitions. best regards, lucas