Topic: Need to clean up the threads on the rear wheel flange

[craigermags]

I am working on a 1970 CB750 rear wheel flange. I purchased a new rear retainer (41231-283-000) but it only threads down about half way into the flange opening and then it binds up like the flange threads taper a bit.

I have cleaned up the flange threads with some dental tools and the threads look clean and sharp.

If I knew how large the diameter of this was I would most likely try to find a metric tap and use it to clean up the threads.

Do any of you have any thoughts on this . Thanks for your time Craig

[mystic_1]

A tap that large would be very expensive, especially an end tap, which is what you'd need since the depth is so short.

Instead, get a smaller metric tap with the right size thread pitch, and use it to "rake" the threads.  That should help you find any uneven spots that you wouldn't find with a point tool like a dental pick.

Are you going to re-stake it, or use locktite?  If you're going to stake it, use a bit of anti-sieze compound on the threads to help lube it a bit for installation.

Do you have a proper pin spanner, or did you fab something up?

mystic_1

[evanphi]

My post from the Tips and Tricks section:

They are pretty soft metal, so easily done! The thread pitch for the retaining ring on the front wheel is 1.5mm, the same as an M10 bolt. Luckily that is the same as the oil drain plug. I just changed mine so I had the old one kicking around. Run that bolt with plenty of pressure around the retaining ring, and also on the hub inner threads. Any spots that are especially warped, like on mine where I used a punch to turn it out, and where the original stakes were drilled out, use a small jeweler's file to get rid of the big chunks, then the M10 to reshape.



Rear wheel:

Sprocket carrier: 1.00mm pitch, same as an M6.


Hub: 1.5mm pitch, M10, same as front wheel.

[craigermags]

Using a small thread tap is a great idea.

Do you think a honda repair shop would have the correct tap if I am unable to accomplish myself>

[craigermags]

Thanks all for your suggestions. I was considering purchasing a correct reconditioned flange from www.yamiya.com, which would have also included the installed bearings and polished for $265.00 US. However, after using the idea of running a correct pitched bolt around the inside and with the fine work I did with a dental pick to clean out the threads the new retainer I got screws down easy and free of any hangups so once I get the new bearings installed this part of the restoration is done.  Thanks again

[mystic_1]

Excellent, glad you got it sorted.

Are you going to stake the new one, or use loctite?

mystic_1

[evanphi]

Glad it's all sorted now.

[craigermags]

Mystic, I think given the choice of pinning it or locktite I think I will use the latter in case I have to do it again.

Thanks for your help again.