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Author Topic: CB750A Output Shaft Oil Seal  (Read 699 times)

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Offline LiveeviL81

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CB750A Output Shaft Oil Seal
« on: February 10, 2024, 12:05:36 PM »
Hey guys,
Ordered an 77-78 Output Shaft Oil Seal from CycleX, hoping it would be the same as the A, but after comparing it to my old one, it is thinner and slightly smaller OD on the seal. I think I can get it to sit on the shaft, but not sure if it being thinner won't allow it to seal correctly. Where else would I source one?

http://www.cyclexchange.net/Oil%20System%20Comp%20Page.htm (Honda CB750 77-78 Oil Seal)

Kaleb
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Online newday777

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Re: CB750A Output Shaft Oil Seal
« Reply #1 on: February 10, 2024, 12:53:44 PM »
You need the seal behind the front sprocket?
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline kmb69

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Re: CB750A Output Shaft Oil Seal
« Reply #2 on: February 11, 2024, 07:21:01 AM »
It is a non-standard size seal - 34x62x13. Non OEM seal that should work, 34x62x12 available:
https://avxseals.com/products/shaft-oil-seal-tc34x62x12-rubber-covered-double-lip-w-garter-spring-id-34mm-od-62mm-34x62x12-34-x-62-x-12-mm
« Last Edit: February 11, 2024, 07:30:10 AM by kmb69 »
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Offline LiveeviL81

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Re: CB750A Output Shaft Oil Seal
« Reply #3 on: February 12, 2024, 11:45:28 AM »
Quote from: newday777 on February 10, 2024, 12:53:44 PM
You need the seal behind the front sprocket?

Yessir, for a 78’ CB750A.
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Offline Don R

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Re: CB750A Output Shaft Oil Seal
« Reply #4 on: February 12, 2024, 02:07:32 PM »
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Offline LiveeviL81

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Re: CB750A Output Shaft Oil Seal
« Reply #5 on: February 12, 2024, 02:32:47 PM »
Quote from: Don R on February 12, 2024, 02:07:32 PM
Partzilla shows two, one available one not.
https://www.partzilla.com/catalog/honda/motorcycle/1978/cb750a-a-750-hondamatic/top-clutch-countershaft

Looking for #28, looks like 29 is the part I got (assuming the 7 is the thickness) Must be for the normal CB750's. I'll go ahead and order it off the website kmb69 provided.
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Offline kmb69

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Re: CB750A Output Shaft Oil Seal
« Reply #6 on: February 13, 2024, 06:00:48 AM »
Quote from: Don R on February 12, 2024, 02:07:32 PM
Partzilla shows two, one available one not.
https://www.partzilla.com/catalog/honda/motorcycle/1978/cb750a-a-750-hondamatic/top-clutch-countershaft

It's a rather sucky arrangement, but both are used together in the A's.
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