Harmonics around 5000 RPM - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 11 Old 06-07-2019, 08:46 PM Thread Starter
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Harmonics around 5000 RPM

I have a 2013 Vstrom 650 DL bought used. Runs well and quietly and as wished, except around the 5000 RPM mark, doesn't matter what gear. Between around 5000-5100 RPM it starts to have a growl to it. Slower and higher RPMs sound disappears.

Has anyone else noticed a similar pattern? Thoughts?

Thank you.
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post #2 of 11 Old 06-07-2019, 08:55 PM
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If it has crash bars, that is the probable culprit.
you could try googling vibrations at 4-5 K rpm.
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post #3 of 11 Old 06-07-2019, 10:28 PM
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Crash bars etc. seem to emphasise an existing harmonics issue around 4,800 rpm.
See here:
https://www.stromtrooper.com/dl650a-...ibrations.html
https://www.stromtrooper.com/dl650a-...ns-66-mph.html

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post #4 of 11 Old 06-08-2019, 02:20 AM Thread Starter
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Thank you. I was worried it might be something internal. Crash bars make sense and if others have experienced, probably what I am hearing.
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post #5 of 11 Old 06-08-2019, 02:47 AM
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You can damp it somewhat by adding some rubber into the connection between the left and right side sections where they join in front of the motor. My last set were Givi and they have a plug at the join between the two sides. I used plastic tape and rubber o-rings where the sections meet. It's not a cure so much as reducing the effect.
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post #6 of 11 Old 06-08-2019, 05:07 AM
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I replaced the metal joiner between my Givi halves with one of these. It is a 12mm garden hose joiner. A perfect fit.
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post #7 of 11 Old 06-08-2019, 07:55 AM
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Quote:
Originally Posted by Brockie View Post
I replaced the metal joiner between my Givi halves with one of these. It is a 12mm garden hose joiner. A perfect fit.
That gives me something to look for in the local hardware store. There must be something similar available in the US.

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post #8 of 11 Old 06-08-2019, 08:57 AM
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I would have thought that there would be something identical. It's a click on garden hose joiner. This one is made by Nylex, but there are Pope and Gardena as well. 13mm hose coupling.
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post #9 of 11 Old 06-08-2019, 03:40 PM
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Quote:
Originally Posted by Brockie View Post
I replaced the metal joiner between my Givi halves with one of these. It is a 12mm garden hose joiner. A perfect fit.
I like the idea if your skid plate does not attach to the cross member. If it does though you have no real structural support there. Right?
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post #10 of 11 Old 06-08-2019, 05:03 PM
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Quote:
Originally Posted by bandoeagle View Post
I have a 2013 Vstrom 650 DL bought used. Runs well and quietly and as wished, except around the 5000 RPM mark, doesn't matter what gear. Between around 5000-5100 RPM it starts to have a growl to it. Slower and higher RPMs sound disappears. Has anyone else noticed a similar pattern? Thoughts? Thank you.
It may just be the crash bars that need tightening or damping or whatnot. However, if you can feel excess vibes in the seat, handle bars and foot pegs your motor my be out of balance. My 2014 DL650A that I bought in April of last year was always viby from new per the seller. It turned out the lower front throttle body was loose causing my Givi crash bars to vibrate like crazy right at 5100RPM.

Loose lower Throttle Body boot causing vibrations.

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