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Old 04-25-2014, 12:24 PM   #1
SideVinder650
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Question How to isolate that pesky vibration, tick, ping, noise, or hum

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Mechanics stethoscopes can be extremely useful tools to identify the various noises, new noises, and sometimes worrying noises that our bikes make. They help us to identify issues before they become catastrophic problems but they only work to an extent.

Such as while the bike is on, idling and in neutral.

Most of the time this works up to a certain point, but when a bike is in gear and in motion its nearly impossible to use your stethoscope (safely) to identify the noises it makes that are only audible while the bike is in motion.

Aside from technicians at a shop for example, who have a dyno and can run the bike in place while another person probes the bike for the noise, What are some ways that one at home hobbyist might try to isolate those noises that are only audible when the bike is in motion?

Feel free to lend any ideas you may have that are outside the box as im open to anything I just want to know whether the different hums, ticks, buzzes and noises im hearing are the plastics rattling, the engine or what, and I cannot seem to do that while the bike is at idle, and sure cant do it safely while its in motion.

Also, any techs in the forum how do you guys go about isolating noises that customers complain about?

Any information would be greatly appreciated,
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Old 04-25-2014, 01:07 PM   #2
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Let your friend pilot the bike and Ride . Just make sure he buys you dinner first.
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Old 04-25-2014, 01:47 PM   #3
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turn up the iPoD. when it falls apart you will know exactly what it was and not have to guess about it any longer. JK
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Old 04-25-2014, 04:15 PM   #4
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Quote:
Originally Posted by Kawafasty View Post
Let your friend pilot the bike and Ride . Just make sure he buys you dinner first.

actually this might not be a bad idea, if we did it in an empty parking lot but its still not the BEST of options, ideally i'd like to be infront of the bike probing while he's stationary but moving, kinda like with the rear wheel spinning like on a dyno.
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Old 04-25-2014, 04:37 PM   #5
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Put it on a stand?
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Old 04-25-2014, 04:56 PM   #6
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Put it on a stand?
never thought about that. like a rear wheel lifting stand? (couldnt be put on more conventional bike lift because those dont raise the rear wheel; they only lift the bike)

it would have to be something that would suspend the rear wheel....maybe a super sturdy rear wheel stand while a buddy rides it....would have to find or possibly fabricate a super strong one for this.


i like this idea.
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Old 04-25-2014, 06:27 PM   #7
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Back it up to a treadmill, chock up the front tire and run it... works great.

chassis ears...



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Old 04-25-2014, 06:53 PM   #8
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Pitbull stand
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Old 04-25-2014, 09:10 PM   #9
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Rear stand works. Just don't use it so you can clean your chain while in gear.
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you need to tell trey, "stop asking asian riders for BP dummies"...
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Old 04-25-2014, 10:16 PM   #10
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They make noises. Whats the problem?
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Old 04-28-2014, 08:31 AM   #11
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hear anything strange or feel anything strange with the bike in N and the rear on a stand when you rotate the back tire? (with the motor not running)

Last edited by urbanXJ; 04-28-2014 at 08:34 AM.
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Old 04-28-2014, 04:18 PM   #12
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Quote:
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hear anything strange or feel anything strange with the bike in N and the rear on a stand when you rotate the back tire? (with the motor not running)
No i dont, but its buzzing and humming at speed and im not sure if its plastics or loose bolts or what
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Old 04-28-2014, 04:20 PM   #13
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Quote:
Originally Posted by mx6er View Post
Back it up to a treadmill, chock up the front tire and run it... works great.

chassis ears...

Amazon.com: Steelman (STE97202) Wireless Chassis Ear: Automotive
thanks for the link, these are really cool i'd love to see how they work. they appear to be "alligator" style clips that plug into electronic "terminals" that record? sound so you can play it back? or do you hook up a head phone for on the fly listening? i read the product description but didnt gather much from it,

i would love to see these in action, maybe youtube will have a video.
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Old 04-30-2014, 07:17 AM   #14
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My shop has a set. There is a lot of set up and test/tune time to get desired results. When you have a tech that really knows how to use them they seem to work very well. If not, its the blind leading the blind...

I would think a good solid rear stand and two friends to stabilize and operate while you probe would be pretty good. That would eliminate the noise and input a dyno would create.
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