Painting hubs

[tony27]

Hopefully 090 can help me out

Have just received a rear hub from the states & want to paint it etc before having it spoked up & would like advice on what steps etc I should take
Beadblast?
Primer & paint or powder coat?
Best colour match if painted by hand

Any help greatly appreciated

[090]

My old man painted the 360 ones. He sand blasted, primed and used an acrylic colour from Krylon. The paint is called 18 carrot plate, with a coat of two pack clear over the top.
The original gold is hard to match and this colour is not the same. Just gives the desired effect.

[tony27]

Thanks for that, near enough is what I'm after just as long as it gives a degree of corrosion protection.
Am I correct in thinking etch primer is a no no?

[090]

I don't know but dad would have used an acrylic primer.

[VMX60]

Tony
Be very careful blasting magnesium CZ hubs they will end up with pin holes completey stuffed 
Nothing harder than glass beads if at all
Better to play safe clean by hand
Gold colour is a pain to match

[tony27]

Our bead/sand blaster at work gets used mainly for removing the shine from aluminium milk bottle moulds to stop the bottles sticking, I dont think it would damage the hub but I will have a good look at how much prep work needs doing later today

[Davey Crocket]

Remember to paint the inside as well....1 drop of water in there from washing or a wet ride and the corosian will start, I think magnesium is like a magnet to water so to be safe paint every bit......inside and out!!!, cheers John.

[tony27]

Inside is something I'd thought about as well & will do.
Took the bearings out while at work, brake side was still the original from the looks of it but the other side had a needle roller fitted which wasn't so good. It meant the wheel was only located by the 1 bearing, the needle roller also wasn't as tight as it should have been & will need some careful checking to make sure the hub doesn't need bushing before I paint it

[VMX60]

Needle roller sure is wrong ,Drive side should be a twin roller type same as crankshaft mains 3205 ?
other side single row bearing 6205
Just make sure heat the hub and freeze the bearings when you replace them . banging bearing in or out cold will stuff the OD surface

Sure we have all came across wheels that have had the bearing smashed in with a BIG hammer

Tony hope you can save the hub after  buying it from the states




 

[LWC82PE]

Am I correct in thinking etch primer is a no no?

No, an etch primer is a good thing and is especially good for alloy/magnesium. I would recommend it.

[tony27]

VMX60, drive/brake side is the normal double row type, its just the other 1 that was a surprise. The bearing came out easier than expected but is by no means loose so its shouldn't be a problem with maybe a drop a bearing mount loctite as a possibility.
The 69 hub that is in the bike flogged out its housing at 1 stage & I repaired it by boring it round & parallel then fitting a pressed in stainless sleeve which was then bored to the proper fit. Should not come to that though

[VMX60]

Good news

 The 69 CZ sidepiper rear sprocket had rivets std are you restoring or racing with a bolt up sprocket 

Cheers

[tony27]

The 69 rear wheel has been converted to bolt up sprocket, original had the teeth turned off & a new sprocket turned up to fit. Not planning a full on resto but will have to hide the mikuni from my father when it turns up. At the moment the bike is very original apart from the rear wheel & a falk front guard which needs the hot air treatment to widen it back to the proper width for tyre clearance

[tony27]

Put the bearings back in yesterday & found about 1mm of movement/endfloat in the centre spacer, no play in the bearings only the spacer moves. I can't see that as normal as when you do up the axle it would apply force to the bearings. 
Looks like I'll have to pull the bearings back out & make a shim to go against the shoulder on the spacer to correct this

[piney]

Definetly use etch primer and remember only to put a verry light see thru coat
ps I'm a spraypainter and used to be a tech rep for Du Pont
hope this helps
cheer's