Inlet rubber3bn/3et
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@ricky0115 https://www.pjme.co.uk/acatalog/Yamaha_DT125R_Tools___Workshop_Equipment_.html
Loctite Adhesive Spray.
Bought that like 5 years ago and still use it today.
People will no doubt say it's unnecessary. All I can say is I've only built engines with it and never had any problems. But I'll admit it's potentially over cautious.