honda305 Home honda305 Auctions honda305 Gallery honda305 Forum Electronic Ignition honda305 Forum honda305 Forum honda305 Forum honda305 Racing honda305 Literature

Auctions  Mailing List    Registry   Marketplace

honda305.com Forum - FULL SCREEN

honda305.com Forum

Login
□ Search
  □ CLASSIFIED_ADS
□ FAQ 
  □ SEARCH_ADS
□ 
  □ MY_ADS
Vintage Honda Owners,
Restorers, Riders and
Admirers

what are these vents for?

Post Reply
kennedy759
honda305.com Member
Posts: 35
Joined: Sun Dec 22, 2019 2:08 pm

what are these vents for?

Post by kennedy759 » Sun Jan 05, 2020 4:50 pm

on my 67 ca78 there is a vent nipple on the rear of each cylinder, they also hold a clip for the spark plug wires, what do these vents do and where does the vent tube go to?
67 ca78 Dream
82 cb450 Nighthawk
05 kfx700
07 mule
97 vette

mike in idaho
honda305.com Member
Posts: 410
Joined: Sun Jan 29, 2012 9:18 pm
Location: orofino, idaho

Re: what are these vents for?

Post by mike in idaho » Sun Jan 05, 2020 9:18 pm

They vent the intake valve guides to keep vacuum from sucking oil into the engine while coasting in gear. They were attached to a teed line that plugged into the front of one air cleaner. Honda did away with them on the later engines.
'65 YG1
'65 CB160
'66 CL160
'66 CL77
'78 XS650
'79 GL1000
'69 T100R
'68 TR6
'69 T120
'72 750 Commando
my company car is a Kenworth

kennedy759
honda305.com Member
Posts: 35
Joined: Sun Dec 22, 2019 2:08 pm

Re: what are these vents for?

Post by kennedy759 » Sun Jan 05, 2020 11:50 pm

my air cleaner has 2 ports, they are broke off, is this where these line go to?
67 ca78 Dream
82 cb450 Nighthawk
05 kfx700
07 mule
97 vette

LOUD MOUSE
honda305.com Member
Posts: 7810
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: what are these vents for?

Post by LOUD MOUSE » Mon Jan 06, 2020 5:13 pm

Your air cleaner has 2 HOLES.
The top vent goes in one and the other tube goes in one. ..............lm

kennedy759
honda305.com Member
Posts: 35
Joined: Sun Dec 22, 2019 2:08 pm

Re: what are these vents for?

Post by kennedy759 » Tue Jan 07, 2020 9:57 am

got it thanks
67 ca78 Dream
82 cb450 Nighthawk
05 kfx700
07 mule
97 vette

Post Reply

 


 

CB-77 | CYP-77 | Road Test | Riding Log | Literature | Zen | Marketplace | VJ Survey | Links | Home