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Author Topic: Loose bolt on front sprocket.  (Read 1010 times)

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Offline jtb

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Loose bolt on front sprocket.
« on: October 24, 2006, 05:30:18 PM »
I seem to have a recurring problem with the bolt on the front drive sprocket, it loosens up by about 2 turns.  Last night I took the bolt out and put blue locktite on the threads and tightened it to about 23 ft/lbs.  Any other ideas?
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1977 CB750F
1985 V65 Sabre
1986 VFR 750 (gone but missed greatly)

Offline MRieck

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Re: Loose bolt on front sprocket.
« Reply #1 on: October 24, 2006, 05:58:47 PM »
Tighten it up to 30lbs or so.
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Offline jtb

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Re: Loose bolt on front sprocket.
« Reply #2 on: October 24, 2006, 06:05:57 PM »
Thanks, Mike
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1977 CB750F
1985 V65 Sabre
1986 VFR 750 (gone but missed greatly)

Offline Porscheguy912

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Re: Loose bolt on front sprocket.
« Reply #3 on: September 17, 2010, 08:46:52 PM »
Hellloooo,
I know this is a resurrection of a old post but i think its a relevant question....

So my front sprocket bolt came loose and cracked the outer case cover.
I need to get a new bolt because the old one is cashed. Anyone know what size and pitch that bolt is?
I have a 78 CB750F with the single bolt in the middle.
Also, shouldn't it have a lock washer on there? All that's on there now is a fender washer.

I didn't find the info in the factory manual either.

Thanks!
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Current: 1978 CB750F3
Past: 1974 CB550K

Offline bwaller

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Re: Loose bolt on front sprocket.
« Reply #4 on: September 17, 2010, 09:00:54 PM »
8x1.25mm and I measure about 16mm of thread. There should be a lock plus a large flat washer.
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KingCustomCycles.com

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Re: Loose bolt on front sprocket.
« Reply #5 on: September 18, 2010, 03:26:27 AM »
Weren't some of these sprockets designed to "float" giving the appearance of being loose?
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Offline Johnie

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Re: Loose bolt on front sprocket.
« Reply #6 on: September 18, 2010, 06:32:27 AM »
Yes, the front sprocket has some play in many of these vintage bikes. Keep in mind Honda suggests Lock-Tite on the 2 smaller sprocket bolts.
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline SOHC Digger

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Re: Loose bolt on front sprocket.
« Reply #7 on: September 18, 2010, 07:18:30 AM »
I had the same problem before and no matter how tight I got the bolt, it would still walk out.  Finally I put red loctite on the threads and it has stayed put ever since.  Blue loctite should work for you, but if not, step up to the red.
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