Airbox hose & engine hose
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Do you mean part number 17 on the picture and im pretty sure that's the crankcase breather.
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@LJK_hunter that's it! Thanks very much. Should it have a hose on it to stop any water getting down?
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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.