The secondary air supply device includes an air filter (35) fitted to the silencer (28). The outer end of the secondary air supply tube is connected to the air filter to supply secondary air to the exhaust system. This tube includes a no-return valve (36) in its middle sector. The no-return valve is also fitted to the silencer. Alternatively, the air filter may be at the side, against the transmission casing (22), or may be made in one with the air filter for the intake system, with a common air cleaning chamber for both filters.
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