Motorcycle with engine under main frame and behind subframe, with secondary exhaust gas air valve taking secondary air to engine outlet channel via tube

摘要

The motorcycle (1) has a main frame (4) extending back from the head tube (2), a subframe (5) extending down from it, an engine under the main frame and behind the subframe, and an secondary exhaust gas air valve (20) on the subframe, connected to a secondary air supply tube (25) to take secondary air to an engine outlet channel via the secondary air supply tube.