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 My 1974 Honda CB750

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Dale N.
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Dale N.

Number of posts : 1693
Age : 74
Location : Princeton, MN
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Registration date : 2014-02-13

My 1974 Honda CB750 Empty
PostSubject: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu Apr 21, 2016 5:29 pm

This might be a little off topic for a SWing forum but I thought I'd throw it out anyway.

My CB750 sat over the winter. I just got done rebuilding the four carbs on it today. When I put it all back together and turned on the gas it started leaking between carbs 3 and 4 where the fuel rail tube feeds gas from the tank to both carbs via the gas line. Between carbs 1 and 2 there's no leaking. I can see the gas coming out of the carb 3 and not the hose but not sure if #4 is leaking also. I don't think so but I could be mistaken.

My question is: Will the O-Rings swell back up after gas hits them? I did a google search and some of the other forums suggested that they would in 24 hours or so. Does this sound logical? They've never leaked before and that's why I'm asking.

Thanks for any info you all might be able to throw my way.

Dale
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Cosmic_Jumper
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Cosmic_Jumper

Number of posts : 3780
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu Apr 21, 2016 7:23 pm

Lemme get this straight; it didn't leak until you fixed it? Shocked

Tim

Sorry Dale I just couldn't resist.
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oldwingguy
Silver Wing Guru
Silver Wing Guru


Number of posts : 1825
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu Apr 21, 2016 9:31 pm

FWIW, from what I've seen they won't, my tractor had them and didn't, perhaps a gasket may after the fuel wets them but O rings should be petrol proof.
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Dale N.
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Dale N.

Number of posts : 1693
Age : 74
Location : Princeton, MN
Points : 4495
Registration date : 2014-02-13

My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu Apr 21, 2016 9:32 pm

Cosmic_Jumper wrote:
Lemme get this straight; it didn't leak until you fixed it? Shocked

Tim

Sorry Dale I just couldn't resist.

That's right! See how good a job I can do!!!

In my defense I didn't have gas in it before I "fixed" it.
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Dale N.
Site Admin
Dale N.

Number of posts : 1693
Age : 74
Location : Princeton, MN
Points : 4495
Registration date : 2014-02-13

My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu Apr 21, 2016 9:34 pm

Thanks oldwingguy. That's kind of what I thought too but some other forums said they should reseal themselves. I guess I'll have to take it all apart tomorrow and put new O-Rings in it. THEN I can terrorize the streets...
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oldwingguy
Silver Wing Guru
Silver Wing Guru


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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri Apr 22, 2016 8:04 am

Over the years I've found reusing them is 50/50 at best. One wee nick or a slight misplacement on assembly has caused leaks. Good luck with your's.
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roadrunner
Super Scooter Rider
Super Scooter Rider
roadrunner

Number of posts : 231
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri Apr 22, 2016 10:33 am

I was a Honda parts manager and service writer in the last seventies. Don't even try to reuse the old o-rings, they won't swell back up once they get hard and dry.
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Dale N.
Site Admin
Dale N.

Number of posts : 1693
Age : 74
Location : Princeton, MN
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri Apr 22, 2016 9:50 pm

Thanks roadrunner. That's kind of what I thought too. No sense taking chances. New is better than old crap.
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Greysilver
Silver Wing Rider
Silver Wing Rider
Greysilver

Number of posts : 491
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Location : Arizona
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeThu May 05, 2016 7:53 pm

Hi Dale, Cosmic, I try to "fix" as few things as possible. Remember the old chevy truck creedo ( ford too) "if it ain't broke, don't fix it". Rolling Eyes
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exavid
Silver Wing Guru
Silver Wing Guru


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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri May 06, 2016 7:47 pm

Not quite true, the old Ford motto was: "Fix Or Repair Daily".
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Easyrider
Silver Wing Expert
Silver Wing Expert
Easyrider

Number of posts : 976
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri May 06, 2016 8:27 pm

exavid wrote:
Not quite true, the old Ford motto was: "Fix Or Repair Daily".

OR " Found On Road Dead"
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exavid
Silver Wing Guru
Silver Wing Guru


Number of posts : 2658
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri May 06, 2016 8:45 pm

Yep, that's what happened when you didn't fix or repair daily! Crying or Very sad
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hankster
Maxi-Scooter Rider
Maxi-Scooter Rider


Number of posts : 140
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Location : Fort Myers FL
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri May 06, 2016 9:01 pm

Or First On Race Day Smile
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Dale N.
Site Admin
Dale N.

Number of posts : 1693
Age : 74
Location : Princeton, MN
Points : 4495
Registration date : 2014-02-13

My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeFri May 06, 2016 9:39 pm

exavid wrote:
Not quite true, the old Ford motto was: "Fix Or Repair Daily".

Or, "Found On Reservation Dump"

I did pull the carbs apart and put new O-Rings in. I figured better safe than sorry.
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oldwingguy
Silver Wing Guru
Silver Wing Guru


Number of posts : 1825
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My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeSat May 07, 2016 8:12 am

FORD no mention of Chevrolet, some people shove em, some people just letem lay Smile or Dodge Ram, Dis Really be A Mess Laughing
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hankster
Maxi-Scooter Rider
Maxi-Scooter Rider


Number of posts : 140
Age : 68
Location : Fort Myers FL
Points : 2213
Registration date : 2015-11-14

My 1974 Honda CB750 Empty
PostSubject: Re: My 1974 Honda CB750   My 1974 Honda CB750 I_icon_minitimeSat May 07, 2016 9:46 am

CHEVROLET
Can Hear Every Valve Rap On Long Extended Trips
Cheap, Hardly Efficient, Virtually Runs On Luck Every Time
Cracked Heads, Every Valve Rattles, Oil Leaks Every Time
Constantly Having Every Vehicle Recalled Over Lousy Engineering Techniques

GMC
Garage Man's Companion
Gotta Mechanic Coming?
Generally Mediocre Cars
Gets Mechanics Crazy
Gods Mechanical Curse
Got More Crap

MOPAR
Many Odd Parts Arranged Randomly
Miscellaneous Oddball Parts Assembled Ridiculously
Most Often Passed At Races
Mostly Old Parts And Rust
Move Over People Are Racing
My Old Pig Ain't Running
My Only Problems Are Repairs
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My 1974 Honda CB750
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