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Many competitors have to mount on 28" centre. The result is a simple, compact design that improves overall operation. Honda’s variable intake system utilises a plenum chamber with twin butterfly valves to control the volume of intake air into the combustion chambers.
![bf225 honda hds bf225 honda hds](https://i.ytimg.com/vi/NwoXfeV0NFc/maxresdefault.jpg)
An O2 sensor, together with the ECM, precisely controls the air/fuel mixture for the best fuel economy at cruise setting.