 Another chain guard broken
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Joined: Mar 2006
Posts: 50
Member
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OP
Member
Joined: Mar 2006
Posts: 50 |
Broke another chain guard yesterday, this one did'nt get my back tyre. But had to leave it at a cafe in the hills, I might look at bolstering the rear lug or rubber mounting the whole thing. 4th one to date since 2004. (22000 kilometers). 
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Re: Another chain guard broken
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Joined: Sep 2009
Posts: 950
Banned
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Banned
Joined: Sep 2009
Posts: 950 |
Being a metal worker Im very curious about this broken chain guard thing.Where exactly do they break?Does anyone have pics of a broken one?
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Re: Another chain guard broken
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Quote:
4th one to date since 2004. (22000 kilometers).
Wow! Maybe just ride without one? I turfed mine and never looked back. Still though... they shouldn't break.
Live to love, love to live.
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Re: Another chain guard broken
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Joined: Aug 2007
Posts: 10,731 Likes: 6
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,731 Likes: 6 |
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Another chain guard broken
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Joined: Feb 2006
Posts: 3,099
Loquacious
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Loquacious
Joined: Feb 2006
Posts: 3,099 |
I took mine off when I put the belt-drive on.
Was afraid it would break and cut the belt.
That new one looks stronger.
Uncle Charlie
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Re: Another chain guard broken
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
thats wierd I cant even guess what would cause the chain guard to break
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: Another chain guard broken
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Joined: Jan 2005
Posts: 1,425
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,425 |
Mine have not broken but the screws like to back out. Locktight to the rescue.
Mal: "Y'all see the man hanging out of the spaceship with the really big gun?{ref, Jayne} Man's lookin' to kill some folk. So really, it's his will y'all should worry about thwarting."
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Re: Another chain guard broken
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Quote:
thats wierd I cant even guess what would cause the chain guard to break
Fatigue. Poor engineering.
Live to love, love to live.
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Re: Another chain guard broken
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: Another chain guard broken
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Joined: Sep 2009
Posts: 950
Banned
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Banned
Joined: Sep 2009
Posts: 950 |
Its the bend itself. It was made using far too sharp of a bend. It should have a radius.
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Re: Another chain guard broken
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Joined: Jan 2005
Posts: 5,537
Check Pants
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Check Pants
Joined: Jan 2005
Posts: 5,537 |
It's been a while since a break has been reported, so the new design must be an improvement. Mine broke no where near the new gusseted section, but rather on that small tab mount hole. When mounting my replacement, I bought a small chrome washer, and cut it down to fit that slanted angle. So far, no problems or evidence of fatigue. 
Al
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Re: Another chain guard broken
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Joined: Jan 2005
Posts: 11,126 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,126 Likes: 13 |
Quote:
...Mine broke no where near the new gusseted section, but rather on that small tab mount hole...
+1
Blowing gravel off rural roads
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Re: Another chain guard broken
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Joined: Feb 2005
Posts: 20,096 Likes: 2
Fe Butt
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Fe Butt
Joined: Feb 2005
Posts: 20,096 Likes: 2 |
Yep! Just like a good Single Malt Scotch, you might call me "an acquired taste" TOO.(among the many OTHER things you may care to call me, of course)
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Re: Another chain guard broken
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Joined: Aug 2007
Posts: 10,731 Likes: 6
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,731 Likes: 6 |
Mine broke at the hole too. You can see the new design has more steel there at the mounting hole, and the steel is a larger gauge than before. Very stiff.
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Another chain guard broken
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Joined: Sep 2009
Posts: 950
Banned
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Banned
Joined: Sep 2009
Posts: 950 |
I have no gussets on my guard at all.Do you guys mean the gusseted section on the new version?
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Re: Another chain guard broken
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
High frequency vibrations....Balance your carbs girls and guys. I haven't loctited anything and nothing has ever fallen off my ride or broken.
Now my old BSA had everything fall off it every fill up. Lower cylinder fastener nuts, horn, zener, fender, etc etc. I even had a spark plug blow out of the cylincer head once and hit me in the chest when I was standing beside it. Vibrated like you know what. Didn't know anything about Loctite then.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Another chain guard broken
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Joined: Mar 2006
Posts: 50
Member
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OP
Member
Joined: Mar 2006
Posts: 50 |
Fatigue. Poor engineering.
Your right Mountainman poor engineering, I have another chain guard but it is not one of the new ones, so I will either leave it off (illegal here)or make my own. As long as I keep the chain clean the bike looks ok without it.
If Im going to stop the vibrations I will need to put the original cams back in, but I have seen a few stock s/m that are running very smooth (no modifications) that have done in their chain guards. 
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Re: Another chain guard broken
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Joined: Jun 2009
Posts: 507
Adjunct
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Adjunct
Joined: Jun 2009
Posts: 507 |
It seems to me that the chain guard is static and has no forces acting on it. What stresses a chain guard enough to make it break? Can maybe see the bolts getting loose...
2005 Speedmaster, Tornado Red, AI removed, Uni Pods, JCW 19" turnouts
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Re: Another chain guard broken
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Joined: Jun 2009
Posts: 507
Adjunct
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Adjunct
Joined: Jun 2009
Posts: 507 |
Never mind. I commented before reading page 2. At the bolt holes, huh?
2005 Speedmaster, Tornado Red, AI removed, Uni Pods, JCW 19" turnouts
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Re: Another chain guard broken
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Joined: Jan 2005
Posts: 11,126 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,126 Likes: 13 |
Blowing gravel off rural roads
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