SOHC.co.uk Forums > CB500/550

What do we see here?

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Trigger:
All engine threads are rolled on SOHC's.
Julie has just reminded me that i did a CB350 four that the owner had rebuilt with stainless head studs . There were so many warped mating surfaces that were beyond repair, the customer found it cheaper to buy another engine and i rebuilt that  ;)

A Die cut thread does not match a rolled thread. Found this out on building a sand cast 750 many moons ago. We here having trouble finding some of the original correct number 8 crank case bolt. The customer had found some longer number 8 bolts to be cut down and a new thread die cut. I have put the crank cases together but, when i went to tighten up the bolts they just spun on the threads and then i remembered that all the threads were rolled. Crank cases spilt, inserted V-coils and that was the only way for the die cut threads to take grip in the threads and take the torque settings  :o   

taysidedragon:
These are the engine studs on my 400f. Main shaft of the stud is smaller diameter than the threaded sections. [ Guests cannot view attachments ]

deltarider:
Forgive me... what is a rolled thread?

Bryanj:
It is a thread formed by rolling plain bar inside rollers with thread form on them, no metal is removed and threaded bit ends up bigger than plain bit, most common on wheel spokes

Oddjob:
Cheers Nigel. Well that looks to be a busted idea, shame but that's sometimes the way things go. I'll have to either buy new ones or plate the old ones after a good polish up to get rid of the pitting etc.

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