Author Topic: Suggestions for fixing a broken clutch cover stud?  (Read 749 times)

Offline owain

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Righto, so I've finally put the gearbox back together and have started rebuilding the transmission on my A10 plunger...but I overtightened one of the 12 clutch cover nuts and broke off the stud (the ones that are seemingly welded to the clutch chain wheel). Not quite sure how to remedy this one so suggestions would be welcome!

Some ideas that I had were...
a) forget about the nut as there are still 11 others holding the clutch cover in place. Although I'm wondering if this would unbalance the clutch slightly introduce abit of wobble?  :!
b) cut the remaining stud off entirely and replace with an appropriate bolt (perhaps tack weld it in place?)

...I've also just bought a used another used clutch chain wheel but would like to salvage this one seeing as they are just becoming more scarse...
Sweden & North Wales
'50 BSA A10
'69 BSA A75R
'29 Rudge Special

Offline Greybeard

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #1 on: 09.08. 2022 14:38 »
I would just forget about the broken one. I don't feel that the missing stud will unbalance the clutch.

Actually, this is a good reminder not to over-tighten those tiny nuts.
Greybeard (Neil)
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Online muskrat

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #2 on: 09.08. 2022 20:36 »
G'day owain.
Same here. One screw is stripped so just left the nut off. No problems at all.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline RichardL

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #3 on: 09.08. 2022 23:39 »
Well, it ain't going to be a perfect part anyway, so you could remove the stud 180 degrees away to improve balance. If you ever want to fix it proper, fixing two won't be much worse than one.

Richard L.

Offline Slymo

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #4 on: 13.08. 2022 01:17 »
Is drilling it out and tapping in a new one not an option?
NZ

Offline Peter in Aus

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #5 on: 13.08. 2022 01:44 »
I left the cover off altogether, made no difference to the clutch, in fact I think it worked better, after 20K it was still working well when I sold it, did not slip and was easy to select N at stand still with engine running.
I use ATF in the primary, that might have something to do with it.

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline Greybeard

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #6 on: 13.08. 2022 09:44 »
I left the cover off altogether, made no difference to the clutch, in fact I think it worked better, after 20K it was still working well when I sold it, did not slip and was easy to select N at stand still with engine running.
Well, OK, but I understand that the domed cover is functional, not cosmetic.
Greybeard (Neil)
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Offline Peter in Aus

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #7 on: 14.08. 2022 01:15 »
I left the cover off altogether, made no difference to the clutch, in fact I think it worked better, after 20K it was still working well when I sold it, did not slip and was easy to select N at stand still with engine running.
Well, OK, but I understand that the domed cover is functional, not cosmetic.

You could be right there GB, I seem to remember reading some where that the cover supports the cage.

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline Minto

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #8 on: 14.08. 2022 02:01 »
Another one here with a stripped thread on one stud and another that’s been replaced with a loose screw and nut.
I just leave the nut off the stripped one.
52 A10 plunger
Aprilia RSVR

Offline owain

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Re: Suggestions for fixing a broken clutch cover stud?
« Reply #9 on: 19.08. 2022 18:02 »
I tried to punch the broken bolt out with a hammer with no luck, so I ended up taking a dremel to it, removed the broken bolt and inserted and tack welded a new 2BA bolt onto it. Looks quite good.

In the meantime the 'replacement' clutch wheel arrived and all of the clutch cover bolts were threaded on it  *roll*. So the plan is to repeat the above with all bolts on the new one.
Sweden & North Wales
'50 BSA A10
'69 BSA A75R
'29 Rudge Special