SOHC.co.uk Forums > CB750

Taking Comstars to bits --- Again.

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bluemouse1006:
Hi

Thought i just had to reply to this as you can see from my photos Ive taken the rear hub out of a comstar to convert my rear drum to a disc . I cans see what everyone is on about the bolts that have small dowels onto the threads of the bolts to lock them in place.
when i removed the bolts the threads on the nuts were totally knackered because of the pins in the bolts,ive managed to save 3 of the bolts with pins intact which i will reuse with new nuts (tighten the nuts up then hammer the pins back in the bolts ) I have another wheel with these bolts so should get another 2 out to finish  the rear disc project.
Please give me your view to the use of an other hub in a different wheel and whether you think its safe ? ive moved the wheel spokes a minimal  amount so not to stress the metal,not touched the rivets at all so they should be ok..



Thanks Amos

hairygit:
I certainly would not attempt to use those spokes again, the angle they have been bent to will almost certainly have caused stress to the metal, that you would not see without specialised X-Ray equipment. The spokes were never designed to be bent like that, the spokes are pressed out at manufacture and bolted and riveted together with extreme care, bending them as you have is a fatigue fracture waiting to happen :o It would be madness to trust the spokes for integrity now, would it not have been easier (and infinitely safer) to have hunted out a disc braked wheel? (750F2 or even the later DOHC 750?) I'm sure anyone seeing those photos with the slightest knowledge of metal stresses/loadings will tell you the same, it's now just a pile of scrap :'( But ultimately, it's your bike, and your life, if you don't value those things, it's your decision

Tomb:
What he^ said.

The bolts and nuts are drilled and pinned, "hammer the pins back in" without drilling???!! :o

If you really want to use the bolts again, angle grind the side of the nut off so the pin can fall out, then wind off whats left of the nut, and use new nuts, and redrill another hole.


--- Quote from: hairygit on July 02, 2012, 06:53:03 PM ---I'm sure anyone seeing those photos with the slightest knowledge of metal stresses/loadings will tell you the same, it's now just a pile of scrap :'(
--- End quote ---

Yup!
Tom (Toolmaker 18 years, Mech Tech 13 years)

Waggles:
+1 on the 'scrap them'

bluemouse1006:
Thanks for your input
Luckely the wheel in the photo is a spare one that I had with a rear disc on it I was going to just put the wheel in but the spokes where very rusty and I couldn't polish them up as you can see from one of my photos the bike and wheels are very shiny and I didn't want to spoil it .
I haven't stripped the rear wheel yet off mine or touched the spokes.

I'll be looking out for another rear comstar with rear disc in good condition ( anyone got one for sale ?? ) so I don't have to mess with the spokes.

Thanks for the comments

Amos

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