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Why some motorcycles designs pull air for the intake through its chassis?

Motor Vehicle Maintenance & Repair Asked by Guilherme Dutra Moraes on August 17, 2021

I couldn’t find this answer nowhere, but i’m very curious about why some motorcycles have a carburetor intake connected to their chassis.

In the image below we can see how the chassis is designed with holes in the lateral/front part of the chassis, to channel the intake air that come through the air filters.

This is a Yamaha V-star 250/Virago 250 chassis

Just for context, this is the whole motorcycle:

Yamaha Virago 250

Any idea why a design like this exists at all?

One Answer

It puts the filter up high and the use of the already existing frame tubes reduces the need for extra pipes that would be a large diameter.

Frame tubes have also been used for storage of oil.

Correct answer by Solar Mike on August 17, 2021

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