Topic: CB750 K4 Axle issues

[Wompom]

Hey guys,
So ive been cleaning up a cb750 that when taken apart had no noticeable gap on the axle. Now the axle is tight but too short in the forks.
the fork and triple are straight, even swapped a different one on and had the same issue. I cant get anything to line up right and dont know why.
As per the diagram i have the axle with the solid end towards the speedo and the nut side by the brake. The nut has the wrench side towards the inside of the forks. It seems like the fender isnt centered on the wheel either and the disk is pulling the caliper way to the outside of the bike. Does anyone have any ideas or recommendations? Im going insane. This is holding up my entire project.
Heres some pictures:








thanks for any help.

[seanbarney41]

check if your fork legs are bent, maybe one slider is stuck up, fork legs not spaced evenly in the trees...hard to tell anything else from your pics.  Maybe there are some incorrect parts there somewhere.  Do have the spacer in the brake side?

[Don R]

 I'd loosen the triples and rotate the chrome tubes to see if one is bent. Buuut first maybe check a parts fische to see if it's assembled correctly.
http://www.servicehondapsn.com/fiche_section_detail.asp

sorry link didn't work.

[754]

Turn the nut around......make sure it's on the correct. Side.

[jonda500]

pull the lowers in toward each other until there's no gap, then hold them there while you tighten the axle cap nuts, done.

Edit: I have to use above method on one of my 500's, but i am only needing to close up a gap of around 3mm between the speedo drive and the fork lower. For bigger gaps, probably not a good idea at all! my bad

[Wompom]

pull the lowers in toward each other until there's no gap, then hold them there while you tighten the axle cap nuts, done.

Ive been told this is the wrong way to go about it.
The legs and tripple are not bent. Ive checked that.
The spacer is on the brake side.
The nut from the diagram goes with the smooth side to the outside doesnt it?

Should the spacer go about half way into that seal?

[754]

There is a spacer that sits in the seal, I think ..on at least one side maybe it fell out?

[Wompom]

There is a spacer that sits in the seal, I think ..on at least one side maybe it fell out?

I have the spacer that is shown in the schematic as on the right and goes into the dust seal. Ive been trying to figure this out for months and am just at a loss right now. I wish i had another CB to look at but im out where they're not too popular.

the spacer would be part no. 2 on this schematic. Thats where i have it. The axle is all set up like in this. Still get about a half inch gap. Have swapped tripples to make sure one isnt bent, have turned legs with the axle in to see if it closes the gap, got nothing.

[DH]

how tall is your spacer. About 17 mm(?) can take pics of mine if you want.
There should be thread sticking out of the disc side nut as well, and the nut installed as you describe.

[Wompom]

how tall is your spacer. About 17 mm(?) can take pics of mine if you want.
There should be thread sticking out of the disc side nut as well, and the nut installed as you describe.

yeah thats about the size of the spacer i believe.
That picture is of the axle with the nut tightened down. i dont get any threads out of the end of it.

[DH]

any chance the axle is wrong? Mine shows about 1 thread sticking out of the spool nut on the left side
with everything tight.
Yours doesnt quite make sense tho, as everything is off to one side, like wheel offset is wrong too.
Any previous work done to hub/bearings? Can you turn the wheel around 180 degrees and install it that way
to determine if offset will then be correct? Rotor will be on wrong side, but maybe offset will be correct?

[PeWe]

The gap is normal. It should face backwards according to this Honda Service Bulletine

[Wompom]

any chance the axle is wrong? Mine shows about 1 thread sticking out of the spool nut on the left side
with everything tight.
Yours doesnt quite make sense tho, as everything is off to one side, like wheel offset is wrong too. Don't think the wheel can be assembled wrong, speedo drive only goes on right side, so wheel cant be installed backwards(?)
Any previous work done to hub/bearings?

Not by me. Part of me wonders if its the axle is wrong, but i dont think it is.
Everything is on right. Its just that the fork leg doesnt sit against the speedo and i dont get why.

The gap is normal. It should face backwards according to this Honda Service Bulletine

im talking about the gap in the axle between the fork leg and speedo drive.

[DH]

Re read my previous post edited about offset

[Stev-o]

Is the nut [#17] on correctly?

[PeWe]

OK, I did not read all posts that careful.
It must be the spacer the other guys talk about or bent fork.
My bike look like this      Yes, my axle holders need to be turned correct

[DH]

Im thinkin you're right pewe and the rest. More like wrong/missing or damaged parts. I'd think maybe you'll want to gut the hub and see what's up unless someone else has a solution. Strange for sure..

[Wompom]

Took some more pictures.
Checked the hub, bearings are good.

[PeWe]

Are the tubes not fitted and clamped into the triple tree?

[Wompom]

Are the tubes not fitted and clamped into the triple tree?

theyre in the triple and bolted.

is there a different installation process i should try?

[oldhatt45]

Wompom,

This is a real stretch, but are the upper and lower triple trees the originals?
Is it possible that one of them is the wrong width???  (top one too narrow or bottom one too wide)

Can you measure the distance between the fork tubes at a few different points?
Maybe right under the lower triple,  then at the height of the fender and finally at the axle (very bottom of round section).
If all the measurements are the same, then maybe we can rule out a problem with the legs themselves.
Take pictures when you measure that show the measurements and post them.  Maybe one of the more knowledgeable guys will be able to give you more info.

Charlie

[scottly]

Wompom, please reduce the image size of the pictures, as it makes for slow downloads, and the extra resolution isn't needed.
Is the front fender forcing the fork lowers apart? See how things line up without the fender..

[754]

I don't think my axles are drilled on the unthreaded end.

[scottly]

The early axles were drilled; that's why I chose the K1 axle over the K7 axle, Frank, due to the lighter weight.

[scottly]

The threaded end of the axle should be nearer to flush with the outside of the nut. Make sure the notches in the speedo drive plate are aligned with the tangs in the drive housing.