What do these vac lines do?

xj750_Pete

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Those hoses are an ingenius idea by the people at Yamaha. It allows easy access for syncing the throttle bodies like everyone else here has already said. On other motorcycles, such as the Kawasaki Ninja ZX-6R, they do NOT come with these and it takes a bit more work to sync the throttle bodies. Good job Yamaha.
 
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