Newbie advice - Could someone tell me what this is on my swing arm?

R

RichRoberts44

New Member
I bought a CB900 that was in pieces. I recieved this swing arm pictured. Firstly, what is that arm that looks like it would attach to the hub? Do i need it? Also, as this arm isnt in the manual for my bike, does that mean its from something else, maybe a CB750? Any help is appreciated.

 
That would be the brake stay. If you (or anybody else) wants to use that swinger, then yes its needed.
 
The swingarms for the 900 and 750 disc braked models are all the same. What manual do you have? The CB900c is different as its shaft drive.
 
I have a CB900F though and not a custom. Im just questioning whether this was brought seperatly by the previous owner. By it not being in the manual but the rest seemingly identical I was wondering if i could chop it?
 
Just to clarify - the Y shaped piece that mounts on the axle holds the disc brake caliper. Not all CB900's had disc rear brakes - some were drum, in which case the arm that braces the caliper mount to the swingarm would be replaced by an arm bracing the drum brake plate to the swinger - same principle - to keep the brake from rotating.
 
The part that looks like it goes down to the hub is the brake caliper mount. Form that, the long "rod" going to a mount at teh front is the Stay a.k.a. Torque arm. Check the parts lists for rear brake and it should be clearer.
 
As teaser has said you need to look at the parts diagrams for the rear brake as well as the swing arm and all should become clear.

Tim, All 1980 DOHC CB900's had rear disc brakes only the early 750 K had drums.
 
notlob said:
As teaser has said you need to look at the parts diagrams for the rear brake as well as the swing arm and all should become clear.

Tim, All 1980 DOHC CB900's had rear disc brakes only the early 750 K had drums.
Click to expand...

Actually when I do some searching, I see many CB900's with the rear drum. I can't tell you exactly what years had what brakes, but it would seem there are lots of CB900's out there with drum brake comstars on them.
 
Tim said:
Actually when I do some searching, I see many CB900's with the rear drum. I can't tell you exactly what years had what brakes, but it would seem there are lots of CB900's out there with drum brake comstars on them.
Click to expand...

You got me thinking there Tim, So did a check as I thought the Custom may of had a drum, I cant find any that came with a rear drum so I assume they were retrofitted or mis labelled as 900s when they are 750s
Have a look here http://www.cmsnl.com/honda-cb900_model165/ they have USA and Euro bikes listed.
 
RichRoberts44 said:
I bought a CB900 that was in pieces. I recieved this swing arm pictured. Firstly, what is that arm that looks like it would attach to the hub? Do i need it? Also, as this arm isnt in the manual for my bike, does that mean its from something else, maybe a CB750? Any help is appreciated.

Click to expand...

That looks like a swingarm from a 1980 CB750F. The 1980 CB900C was a drive shaft bike.
Starting in 1981-82 the CB900F was chain driven but they used the dual piston caliper so it was a little different mount bracket.
The one you have is for the single pistin caliper that was used on the 1979-1980 CB750F.


 
cklamer said:
Starting in 1981-82 the CB900F was chain driven but they used the dual piston caliper so it was a little different mount bracket.
The one you have is for the single pistin caliper that was used on the 1979-1980 CB750F.
Click to expand...

Agreed with you there cklamer. All the 750 and 900 chain drive / disc braked swing arms are the same with the exception of the 750KZ, KA. Just different caliper mounts for the single or dual piston calipers
 
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