Topic: 1982 cb900f supersport front end on 73k

[diggz_82]

Looking around the local C-list ads I came across a 1982 cb900f supersport "project bike" for sale. I have no use for yet another project but was wondering if there may be some modern parts I could use from this bike for my 73 750k cafe project, specifically the braking system. I know that the dual brake system wont bolt right on. But depending on whether the bike has spokes or comstars (have an email in to the owner), and the condition of it, I wouldn't be opposed to just swapping the front end outs. My questions are:

Would I be able to just swap out the fork tubes, or would this require more. If the tubes are different diameter, which they most likely are, could I swap out the entire triple? I was planning on pulling this all apart anyway to replace with tappered roller barrings.

Would the swingarm bolt on to my bikes mounts? I would soooo love to have a rear disc brake, and was planning to pull this apart also to replace with bronze swing-arm bushings.

If possible to do them, would these changes adversely affect the bikes handling?

Thanks guys.

[Triffecpa]

CB900F uses 37mm or maybe 39mm fork tubes.  Can't remember which.  But either way, they are not going to fit your CB750 triple clamps (35mm tubes).  You should be able to use the 900F triple clamps on your 750 frame.  Worst case the steering stem will be too long and you can grind the weld on the bottom and press the 750 stem out and press it into the 900f trees and have it rewelded.  You'll likely want to use the front comstar wheel as it has 5 bolt rotors as opposed to the 6 bolt hubs on the 750. 

Not sure whether the swing arm will fit.  If I remember correctly, the DOHC 750 used a smaller diameter swingarm pivot bolt than did the 900F.  I think that they might have changed the 750 to match the 900 in '81 or '82. 

www.cb1100f.net will have some guys that can give you dimensions on the various DOHC parts.

TR