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Author Topic: What O-Rings for CB750 Carb Connecting Tube  (Read 2296 times)

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Offline zeech

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What O-Rings for CB750 Carb Connecting Tube
« on: August 16, 2015, 11:02:29 AM »
Trying to figure out what the right size o-rings are for the carb connecting tubes.

I have changed these at least 3 times and after the bike sits for a month or so and I turn the gas back on, here comes the gas flowing like wine out of the connecting tubes. I think I've been using 7x11x2 cause that's all I have. Though after doing a little reading it seems like I need 8x2, is that right?

If you know the proper size that are also fuel resistant that would help me a bunch. Thanks!

« Last Edit: August 16, 2015, 11:09:15 AM by zeech »
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Offline HondaMan

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Re: What O-Rings for CB750 Carb Connecting Tube
« Reply #1 on: August 16, 2015, 11:06:29 AM »
Which carbs?
The K0K6/F0 carbs use 2x8mm, minimum thickness 1.9x7.9.
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Offline zeech

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Re: What O-Rings for CB750 Carb Connecting Tube
« Reply #2 on: August 16, 2015, 11:14:29 AM »
1974 carbs 657B.

I could swear I've tried 8x2 in the past but they don't want to fit back in the carb easy.
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Offline HondaMan

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Re: What O-Rings for CB750 Carb Connecting Tube
« Reply #3 on: August 16, 2015, 11:24:28 AM »
Quote from: zeech on August 16, 2015, 11:14:29 AM
1974 carbs 657B.

I could swear I've tried 8x2 in the past but they don't want to fit back in the carb easy.
Nope, they are a tight fit! They have to be...wet them on the way in. I use spit, works great!
:)
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See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline zeech

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Re: What O-Rings for CB750 Carb Connecting Tube
« Reply #4 on: August 16, 2015, 11:27:40 AM »
*thumbs up* thanks HondaMan! I'll give that a go!
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Offline ekpent

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Re: What O-Rings for CB750 Carb Connecting Tube
« Reply #5 on: August 16, 2015, 01:39:34 PM »
Look at post #6 in this thread,member Johnie has a part # from NAPA that he uses for those if you have one of them around you. http://forums.sohc4.net/index.php/topic,110462.msg1238711.html#msg1238711
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