Cyclic "whir" @ 4800 rpm '13 Wee - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 11 Old 07-11-2019, 11:10 AM Thread Starter
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Cyclic "whir" @ 4800 rpm '13 Wee

Just got back from camping in the Olympic rain forest. Yuck. I am getting a rather loud (audible with earplugs) whirring sound at 4800 on the highway. Rapidly cycles on an off at a steady rate with noise lasting longer than the silence but steady like a metronome.
Lower or higher RPMs and it goes away. Kind of high pitched but not a soprano shriek. Any similar experiences? Is this normal? If not, any idea what causes this? Bike is religiously maintained and has no other issues...
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post #2 of 11 Old 07-11-2019, 12:11 PM
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Possibly the TBS, TPS, one of those things. I've noticed a rhythmic sensation when carburetors are out of sync and I kinda sense it on my 04 Wee. Not enough to worry about but something is there.
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post #3 of 11 Old 07-11-2019, 06:57 PM
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Did you recently tighten your chain?
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post #4 of 11 Old 07-11-2019, 10:10 PM Thread Starter
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Did you recently tighten your chain?
Yes as a matter of fact!
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post #5 of 11 Old 07-12-2019, 05:46 AM
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Tyres?

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post #6 of 11 Old 07-12-2019, 11:11 AM Thread Starter
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Tyres?

Harry
Have to rule out tires as the ride was in a mix of heavy rain and dry conditions. No variation in the noise...

Are there specific bearings that wear over 20K miles that could be a suspect?

And would the chain retention (properly measured) have some effect as previously asked?
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post #7 of 11 Old 07-12-2019, 11:51 AM
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Quote:
Originally Posted by Coach23101 View Post
Have to rule out tires as the ride was in a mix of heavy rain and dry conditions. No variation in the noise...

Are there specific bearings that wear over 20K miles that could be a suspect?

And would the chain retention (properly measured) have some effect as previously asked?
Not sure about the effects of properly tensioned, but you suspect the possibility of failing bearings so I thought I would mention an experience we had when buying a used DL1000. A quick test ride up and down the block and it sounded exactly like there was a bearing about to fail. A shot of lube onto the chain and the sound immediately disappeared.

Have you lubed the chain recently?

For the tension question, I would double check the chain slack and the rear wheel alignment just to be sure. Maybe the axle shifted when tightening up the nut. Double check the chain for stiff links and such too.

Does it do it at 4,800 rpm in any gear? Or is it more speed related? Did your tires throw a balancing weight? Cyclic stuff that is isolated to a specific speed (where it resonates) could be tire balance.
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post #8 of 11 Old 07-12-2019, 11:17 PM Thread Starter
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The noise is in any gear. Checked again today and it appeared around 4,400 RPM and got louder up to 4,600. That is probably the speed before as I was just glancing at the tach the first time. This time I looked hard to nail the RPM.
I did lube the chain before the trip and put no more than 300 miles on the bike.
I always use a dial caliper when tensioning so the rear wheel alignment is spot on.
I have no balance weights in either wheel. I use beads.
I will lube the chain again in the morning and see if that has any impact. Thanks!
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post #9 of 11 Old 07-12-2019, 11:29 PM
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Quote:
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Quote:
Originally Posted by Toadster View Post
Did you recently tighten your chain?
Yes as a matter of fact!
Maybe it's too tight? You can get a whirring if it's too tight.

Last edited by Toadster; 07-12-2019 at 11:32 PM.
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post #10 of 11 Old 07-12-2019, 11:34 PM
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The chain should be set a little looser than spec. It may be too tight at maximum spec.


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