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Author Topic: cb750A rear axle size  (Read 4297 times)

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Offline bikerbart

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cb750A rear axle size
« on: February 25, 2009, 10:04:11 AM »
I am going to swap wheels for my Cafe project.I am putting on a sweet set of Cb750 A wheels (spoked,alloy rim)on my 74 750K ,problem is the axle is a smaller diameter,could I just swap bearings on the hub with K bearings?Hub is the same I think.I am NOT going to rebuild the wheels as they are perfect.
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Offline Clyde

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Re: cb750A rear axle size
« Reply #1 on: February 25, 2009, 06:28:49 PM »
According to my parts books, the bearings are the same in the wheel (6304) and also in the sprocket carrier (6305).
Are you sure the axle diameters are different?- as I believe they should both be 20mm
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Honda CB750 K0(original and unrestored), K1(in pieces), K2(restored), F1(restored), 76 750a (awaiting restoration), 1966 Honda CB72
Suzuki GT750 1972 (restored), Kawasaki Z1 1973 (restored)

Offline bikerbart

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Re: cb750A rear axle size
« Reply #2 on: February 25, 2009, 09:17:26 PM »
I havent actually measered it yet,but I just took my existing wheel off the K and tried the axle on the A and it wont fit.It goes in about an inch then stops.The hubs are exactly the same,though the bearings do look different.I knew it was too good to be true.I really want to use these wheels.
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Offline Clyde

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Re: cb750A rear axle size
« Reply #3 on: February 26, 2009, 02:39:03 PM »
I am positive the bearings are the same. Check the numbers.
They should be 6304.
Try putting the A axle in the K wheel
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SOHC4 #1909
Honda CB750 K0(original and unrestored), K1(in pieces), K2(restored), F1(restored), 76 750a (awaiting restoration), 1966 Honda CB72
Suzuki GT750 1972 (restored), Kawasaki Z1 1973 (restored)

fuzzybutt

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Re: cb750A rear axle size
« Reply #4 on: February 26, 2009, 05:45:19 PM »
check to be sure theres no corrosion on the axle or in the bore of the bearings. that makes it feel like something is the wrong size. dress the axle LIGHTLY with some emery cloth or fine sandpaper
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Offline 754

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Re: cb750A rear axle size
« Reply #5 on: February 26, 2009, 07:33:22 PM »
Sounds like your axle has GONEococcous.. or BURRococcous.. :o
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Offline bikerbart

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Re: cb750A rear axle size
« Reply #6 on: February 27, 2009, 12:24:00 PM »
Thanks,I will do that.I will measure it as well.
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Offline bikerbart

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Re: cb750A rear axle size
« Reply #7 on: February 28, 2009, 09:05:05 AM »
Well,I dont have the axles from the set of A wheels.Tried it again and its definitely a smaller diameter.Makes me wonder.The tire on the 74K is fatter than my 73K and in very good shape,so I was going to swap with the 73.When I do so I will check and see if the two axles are the same,and try the 73 axle on the A hub to see if there is a difference.Makes me curious,could I have a different year rear wheel on my 74,would that be the difference?
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