Airbox hose & engine hose
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@Darty That looks to me like it is from a 2005 RE DT125!
It's called the Yamaha Air Intake System YAIS
Believe it or not, a pipe from the exhaust actually plumbs into there!
Yeah just bung it up it's not needed.
The gearbox you will want to run some hose to the floor for that one.