Catalytic Converters
Motorbikes built since the 1990's more often have catalytic converters than those prior to this time. In countries throughout the world there have been studies regarding the impact of 2-stroke and 4-stroke motorbike exhaust contaminants into the air. The conclusion has pretty much been a change in policy requiring the inclusion of catalytic converters be an added feature on these motorbikes.
From all I read it appears most manufacturers have included catalytic converters on 2-stroke and 4 stroked motorbikes for quite sometime. The majority of these motorbikes sold today, will have a catalytic converter. In the event you find one without a converter, if would probably not be a good idea to purchase it.
An older 2-stroke or 4-stroke motorbike, probably could have a catalytic converter added, although it might be expensive to do this.,,,
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