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Anatomy of a Gas Cap

Fuel System: Gas (Petrol) tanks, Carburators
rustywrench
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Posts: 487
Joined: Sun May 10, 2009 10:36 am
Location: Lake Stevens Wa

gas cap

Post by rustywrench » Wed Apr 21, 2010 9:47 pm

I'll third that observation. I've been watching closely and I find wet on the inner most portion of the gasket but not the outer. My two cents, RW

LOUD MOUSE
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Posts: 7817
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: gas cap

Post by LOUD MOUSE » Thu Apr 22, 2010 9:41 am

Those stainless top tank caps have been a problem from the early 60's when they were new.
The worst was if ya screwed it down to bottom the vent would close and ya would suddenly have the carbs run out of gas and ya had to open the cap then continue.
I would turn my caps 1/4 turn closed and could ride without problems.
That said I could always tell if anyone had set on my bike as when I'd be riding the engine would starve out and I'd have to open the cap.
Ever notice how when someone sits on a bike they check the cap for closed???????????????? ..............lm



rustywrench wrote:I'll third that observation. I've been watching closely and I find wet on the inner most portion of the gasket but not the outer. My two cents, RW

GG
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Posts: 144
Joined: Tue Apr 13, 2010 10:45 pm
Location: Costa Rica

Gas cap vent plugged?

Post by GG » Wed Oct 27, 2010 12:14 am

I've fought with my Superhawk suddenly running one carburetor dry for years and never knew what it was! It would usually happen while in the left lane on the freeway going 70 mpg :-( Is there a solution with these caps?
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1966 Superhawk
1966 Superhawk

Vince Lupo
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Joined: Wed May 04, 2005 7:17 am

Post by Vince Lupo » Wed Oct 27, 2010 7:39 am

Here was my solution.....

Image

LOUD MOUSE
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Posts: 7817
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: Gas cap vent plugged?

Post by LOUD MOUSE » Wed Oct 27, 2010 8:43 am

Look at the seal side of the cap and ya will see a 1/16 in. hole near the outer edge.
Drill another 180 across from that hole. .........lm
GG wrote:I've fought with my Superhawk suddenly running one carburetor dry for years and never knew what it was! It would usually happen while in the left lane on the freeway going 70 mpg :-( Is there a solution with these caps?

GG
honda305.com Member
Posts: 144
Joined: Tue Apr 13, 2010 10:45 pm
Location: Costa Rica

Gas cap venting

Post by GG » Wed Oct 27, 2010 12:47 pm

Thanks guys for the feedback. I think I'll try another vent hole as per LM.
Attachments
P5140068b.jpg

Merz64cb77
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Posts: 154
Joined: Mon May 08, 2017 7:42 pm
Location: Mississauga, ON CAN

CB77 fuel cap

Post by Merz64cb77 » Fri May 17, 2019 10:56 am

I managed to use compressed air to remove all the pieces from the gas cap but don’t know how to reassemble it? Can anyone share the order? I assume the black rubber piece rests on top of the spring followed by the metal dome inside.

Thanks
67' CB77
66’ CB77
65’ bomber
68’ hellcat

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