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Latest Registry Entry
1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe
CB77 breather hoses
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prodigal son
- honda305.com Member
- Posts: 12
- Joined: Thu Apr 10, 2025 8:26 am
CB77 breather hoses
While cleaning my bare cylinder head I found the 2 breather hose ports slightly between and below the intake ports vent to inside the intake valve guides. I have never seen this before. Can someone explain the purpose of how this works? Thanks, Gary
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Tim Allman
- honda305.com Member
- Posts: 524
- Joined: Tue Dec 02, 2014 9:25 am
- Location: Guelph, Ontario, Canada
Re: CB77 breather hoses
The story I have heard is that they attached to the air filters with the intent of drawing oil into the valve guides. Original air filters have the connectors but newer ones don't so it seems that Honda thought them unnecessary. I have some little rubber caps over mine but there seems to be no harm in leaving them open.