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Author Topic: cb750: putting a supersport hub on a K bike?  (Read 1544 times)

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Offline paulages

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cb750: putting a supersport hub on a K bike?
« on: July 01, 2006, 02:20:52 PM »
what would be involved in coverting a K bike to a rear disk besides the obvious (needing a hub, rear master, etc.)? will an F hub and disk fit in a K swingarm? are there mounts missing on a K swingarm for the m/c, etc?

the bike is a K3.
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paul
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Offline MRieck

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Re: cb750: putting a supersport hub on a K bike?
« Reply #1 on: July 01, 2006, 03:38:46 PM »
The caliper arm mounting boss is missing in the K arm. If you get an early F arm I would think it would work in regard to swingarm pivot width. The F arm is slightly longer if I remember correctly...no big deal. Mounting the master cylinder would require some thought.
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Offline Terry in Australia

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Re: cb750: putting a supersport hub on a K bike?
« Reply #2 on: July 01, 2006, 07:26:27 PM »
Like this, do that............ ;D
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Offline MRieck

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Re: cb750: putting a supersport hub on a K bike?
« Reply #3 on: July 01, 2006, 07:58:12 PM »
That's a late F arm too.
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Offline Terry in Australia

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Re: cb750: putting a supersport hub on a K bike?
« Reply #4 on: July 01, 2006, 08:20:50 PM »
Thassit mike, off an  F2, on a K0 or K1 frame. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline paulages

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Re: cb750: putting a supersport hub on a K bike?
« Reply #5 on: July 01, 2006, 11:29:39 PM »
terry...what exactly is the setup in that picture? K frame, F swingarm, rearsets?

wanna spell it out for me so i don't have to play trial and error with parts i don't already have?   ;D
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paul
SOHC4 member #1050

1974 CB550 (735cc)
1976 CB550 (590cc) road racer
1973 CB750K3
1972 NORTON Commando Combat
1996 KLX650 R

Offline Terry in Australia

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Re: cb750: putting a supersport hub on a K bike?
« Reply #6 on: July 02, 2006, 04:13:04 AM »
Quote from: paulages on July 01, 2006, 11:29:39 PM
terry...what exactly is the setup in that picture? K frame, F swingarm, rearsets?

wanna spell it out for me so i don't have to play trial and error with parts i don't already have?   ;D

You are correct Paul, it's:
K0 or K1 frame, (can't remember, but very early CB750)
F2 swingarm,
Suzuki GSXR 1000 rearsets.

Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Clyde

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Re: cb750: putting a supersport hub on a K bike?
« Reply #7 on: July 02, 2006, 04:55:49 PM »
I used a 76F swingarm in my K2 along with the F hub, disc, torque arm etc. It dropped straight in.
The 76F caliper is a dual piston cumbersome item which is very heavy and too strong for a back brake. It was substituted for a F2/900/cbx rear caliper, which also fits staight in.
For the mastercylinder I chose a VF750 as it was easily fitted by making up a plate and fitting to the frame. The hardest part was making the linkage from the pedal to the MC
If you use a K swing arm it could be done, but would need some machining of the caliper arm boss and also I think a spacer being made up basically to get the chain alignment right. Also you would need to weld a bracket for the torque arm which goes on top for the disc compared to underneath for the drum brake.
Regds Clyde
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Offline paulages

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Re: cb750: putting a supersport hub on a K bike?
« Reply #8 on: July 03, 2006, 12:08:34 AM »
got any pics, clyde? i'd love to see how that setup looks...
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paul
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1974 CB550 (735cc)
1976 CB550 (590cc) road racer
1973 CB750K3
1972 NORTON Commando Combat
1996 KLX650 R
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