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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