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Old 03-03-2015, 11:39 AM   #1
mac inger OP
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Eek No crash, but a little scare

No crash so that is good, but help me see how this could have happened.

Apparently one of the rear rotor bolts shook itself loose and had started coming off. I was on the freeway riding back home from work and did not feel or hear it (ear plugs and music on the Sena speakers) but it must have been grinding on the brakes for a while (check the pics see how much of the head of the bolt has been ground off ). Once i got off the freeway i hear this bad scrape. I pull to the side but cannot see it then and there. Bike in neutral, i pull it back and the rear wheel locks as if it is in gear. Pushing forward it moves but obviously scrapes and gnashes.

I slowly limped home dragging my feet on the ground hoping the wheel wont lock, the bolt gnashing against the brake.

I guess it is a screw and can shake loose in time...but man that is scary. If instead of slowly being scraped away by the brakes (as you see in the pics) it had caught and locked the rear wheel, i would have went flying in the 405 rush hour traffic. No good. I was going at a pretty good clip.

Have you ever heard of such a thing happening and what do you think might have caused just one bolt to loosen up ? warped rotor maybe ?
I have never heard of it but i guess locktite-ing and checking torque on these bolts must be added to the maintenance checklist ?


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Old 03-04-2015, 07:42 AM   #2
Guano11
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Quote:
Originally Posted by mac inger View Post
...what do you think might have caused just one bolt to loosen up ? warped rotor maybe ? I have never heard of it but i guess locktite-ing and checking torque on these bolts must be added to the maintenance checklist ?
For the questions you're asking, ya oughta consider posting this up in The Garage....
Anyway, glad you found the culprit before it bit you!
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Old 03-04-2015, 10:28 AM   #3
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Note to self: start looking at those bolts every once in awhile.

That's blue loctite, so I thought that would have been enough to keep it in if it was properly torqued down.

Yeah, this may be more appropriate in The Garage


Ah, dude...is that nail polish? (grin)
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Old 03-04-2015, 11:07 AM   #4
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I lost a bolt holding my front caliper on once. That was an interesting stop. Glad you're alright.
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Old 03-04-2015, 12:58 PM   #5
mac inger OP
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Ah, dude...is that nail polish? (grin)
Oh yeah, pink and glitter on top. All sorts of stuff happens to you when you have a daughter :)
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Old 03-04-2015, 05:57 PM   #6
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Yeah, always check and loctite...these things do happen (obviously.)

This is also a reason I'm not comfy riding with ear buds in (or music, period.) Sure, the helmet deadens sound for sure, but you get used to that and it becomes the baseline, so to speak. I'm pretty hyper-cognizant of the sounds my bike or car makes. Sounds are the earliest warning of an issue, usually. Glad it didn't cause a wreck.
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Old 03-04-2015, 06:38 PM   #7
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I got lucky and discovered the shifter assembly barely hanging on when I was cleaning the Magna. Can't imagine what would have happened if I'd been down shifting out on the road.

Remember the old TCLOCK checklist? It works.
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Old 03-04-2015, 07:23 PM   #8
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I dont see loctite on that bolt.
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Old 03-05-2015, 03:39 AM   #9
JettPilot
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Quote:
Originally Posted by Pansy View Post
I got lucky and discovered the shifter assembly barely hanging on when I was cleaning the Magna. Can't imagine what would have happened if I'd been down shifting out on the road.

Remember the old TCLOCK checklist? It works.
Use the brake ??? This sounds like a non issue, and no brainer to me. Its a pain the ass to have the shifter fall off, but not something that would scare me in any way, or be a safety issue....

I use the brakes for what they were designed for, to stop the bike. Brake pads are cheap and easy to change. Engine, clutch, transmission, are expensive, very hard to change, why would you wear those out in " Downshifting " ??

I see some young guys do this in stick shift cars, try to stop them on a level surface by downshifting, thinking they are doing some favor to the car. My reaction is always, have you ever really thought about this bad technique , or just monkey see monkey do ???

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Old 03-05-2015, 04:37 AM   #10
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your bike is falling apart obviously, time for a change.
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Old 03-05-2015, 08:03 AM   #11
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Quote:
Originally Posted by JettPilot View Post
Brake pads are cheap and easy to change. Engine, clutch, transmission, are expensive, very hard to change, why would you wear those out in " Downshifting " ??
Better to wear engine/clutch/transmission down to 70% and change brake pads 9 times than wear engine/clutch/transmission down to 80% and change brake pads 10 times.
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Old 03-05-2015, 10:51 AM   #12
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FWIW, packing an Allen wrench that fits that bolt might have spared you the scary foot-dragging ride home... a minimal tool kit can literally be a lifesaver when you are otherwise tempted to keep going with a known problem.
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Old 03-05-2015, 10:54 AM   #13
JimVonBaden
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It that the factory rotor? Looks like someone forgot to Loctite and properly torque the bolt. Have you replaced the rear brakes or tire? Good time to inspect these kinds of bolts.
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Old 03-05-2015, 12:28 PM   #14
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(Some flavors of ?)Loctite loses strength with high heat.
Seems like a brake rotor is not the right place for that kind.

Have rotors been replaced or removed on that bike?
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Old 03-05-2015, 02:00 PM   #15
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I wonder if you were throwing some sparks down the freeway. Hm, just thought of a scary way to keep tailgaters at bay...
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