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CB175 Clutch Hangs
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I have a problem that has everyone scratching their heads. I have a 1973
CB175 K6 with 11k miles on it. It drives fine with no clutch slippage.
It shifts fine...when moving. But, when I stop for a light
(particularly when it warm) and sit there for a few seconds, the clutch
locks in the dis-engaged position. The handle moves freely the new
clutch cable moves, but the clutch won't engage and the bike won't
move. I can rev the engine, but I have to sit there listening to the
frustrated drivers honking behind me. I've also noticed that even
though the clutch egages at all times when moving, it's not very
smooth.
Speculation has included bad clutch plates, bad springs and a bad
bearng on the actuator. Has anyone had this problem? Any idea on how
to fix it?
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The steel clutch plates may have carved notches in the aluminum center hub,
item # 3
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Also, grease the worm gear, item #6
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When you disengage the clutch, the steel plates hang up in the notches.
The notches don't necessarily ruin the center hub, a little work with a file
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I want to thank you all for the advice. It's more knowledgable input
than I've gotten in the last couple of months talking with mechanics.
I'm on my wat to take the thing apart.
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might help.
Alternatively, the pressure plate, item #6, may be pushing unevenly on the
clutch plates because the
#13 bolts are loose.
I have also seen the #7 springs carve their own notches in the spring guide
towers the bolts screw into.
The springs get hung up in the notches they make.
While you are checking everything out, lay all the steel clutch plates on a
sheet of glass and try to stick a feeler gauge under the plates. If you can
get a 0.005 feeler gauge under the plates they are warped.
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I see you refer to the "new cable". Was the clutch working fine before
this was fitted?
I'd start by checking the cable run and/or adjustment. I'd also check
that the sprocket cover is bolted on properly. The clutch actuator is
mounted on the inside of it, and if the cover is loose, the clutch
won't work properly, as the actuator, instead of pushing the clutch
pushrod *in*, will push the cover *out*.
If those two simple things are OK, I'd pull the clutch. I'd be
surprised if there's much wear in it at a mere 11,000 miles, but there
could be.
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clutch springs and is incredibly simple and as B12 suggests, there
could be notches in it. That would mean somebody's abused it, because
normally those clutches are good for 40k+ miles.
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