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Author Topic: CB750 Carburetor Beather Tube Size  (Read 396 times)

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Offline TrevorEllis

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CB750 Carburetor Beather Tube Size
« on: May 08, 2019, 01:50:47 AM »
Please would someone tell me the ID and OD for the CB750 Carburettor Breather Tube.  Thanks
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Offline Bodi

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Re: CB750 Carburetor Beather Tube Size
« Reply #1 on: May 08, 2019, 07:06:14 AM »
Not sure what you mean by breather tube, but I believe the four overflow tubes and the vent tube are all 5.5mm like the fuel feed tubes. I may be wrong and the vent tube in particular may be smaller?
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Offline ekpent

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Re: CB750 Carburetor Beather Tube Size
« Reply #2 on: May 08, 2019, 08:43:03 AM »
Yes they are smaller then the fuel line,more like 3-3.5mm I think I read recently. The same size is also used on the two vent nipples between the carbs. So you need six pieces of varying lengths if we are talking 1976or older roundtop carbs.
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Offline TwoTired

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Re: CB750 Carburetor Beather Tube Size
« Reply #3 on: May 08, 2019, 10:53:27 AM »
Quote from: ekpent on May 08, 2019, 08:43:03 AM
Yes they are smaller then the fuel line,more like 3-3.5mm I think I read recently. The same size is also used on the two vent nipples between the carbs. So you need six pieces of varying lengths if we are talking 1976or older roundtop carbs.

Yes, 3.5mm I.D.  Don't know why the O.D. would matter.

Cheers,
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