A whining sound - Wrist Twisters
 
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post #1 of 33 Old 09-22-2014, 09:48 AM Thread Starter
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A whining sound

Hope some of you can point me in the right direction as to what is making this sound.

The sound is a whining sound (Wha, wha, wha), like something is out of balance, when decelerating.

The sound immediately goes away when excellerating.

I adjusted the chain with 35 mm of slack, rear wheel alinement and torqued rear nut to 65 foot pounds.

Note: after adjusting the chain the sound is now louder than before adjustment

Thanks in advance.

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post #2 of 33 Old 09-22-2014, 10:02 AM
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Maybe a wheel bearing going bad? It's been discussed a lot here that the 65 lb ft torque is quite a bit high

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post #3 of 33 Old 09-22-2014, 10:05 AM
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Can you tell where it's coming from? Maybe brake pads wearing on warped rotors?

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post #4 of 33 Old 09-22-2014, 10:05 AM Thread Starter
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I should include bike is an 07 with 4600 mis on ODO.

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post #5 of 33 Old 09-22-2014, 10:07 AM Thread Starter
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Sounds like its coming from the rear. When I'm slowing down I can hear it, and I'm not applying the brakes.

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post #6 of 33 Old 09-22-2014, 10:08 AM
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What gear, first? Honda engines whine in 1st gear, it's just what they do.

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post #7 of 33 Old 09-22-2014, 10:13 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
What gear, first? Honda engines whine in 1st gear, it's just what they do.

Hmmmmm.... you maybe on to something..... I'd say 1 or 2nd gear, 25 MPH? Im going slow when I hear it.

I do not notice the sound at, lets say, 40mph.

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post #8 of 33 Old 09-22-2014, 10:24 AM
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Try it... speed up to 40, know what gear you are in; start downshifting and pay attention to when you hit first and let out the clutch. Aim for about 4-5k rpms. You'll get significant engine braking, but you should should hear a constant whine fairly loud that diminishes in volume and pitch as you slow down.

First gear is a straight cut gear I believe, while the rest are all helical. Hence, the whine.

If you hear a persistent 'whub whub whub' sound, there is something else going on. Engine whine is fairly steady.

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post #9 of 33 Old 09-22-2014, 10:42 AM
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Quote:
Originally Posted by g00gl3it View Post
First gear is a straight cut gear I believe, while the rest are all helical. Hence, the whine.
Yep, first gear is a spline (cost saving and all that).

919Fan, did you adjust chain slack with the bike on the center stand or side stand? If it got worse after adjusting chain slack, I would think that it's likely they're related.
Another thought; have you adjusted your seat sag? A chain on the tight side + excess sag might be enough to do it.

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post #10 of 33 Old 09-22-2014, 10:42 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
Try it... speed up to 40, know what gear you are in; start downshifting and pay attention to when you hit first and let out the clutch. Aim for about 4-5k rpms. You'll get significant engine braking, but you should should hear a constant whine fairly loud that diminishes in volume and pitch as you slow down.

First gear is a straight cut gear I believe, while the rest are all helical. Hence, the whine.

If you hear a persistent 'whub whub whub' sound, there is something else going on. Engine whine is fairly steady.
Yeah, this sound it not steady, defiantly a pulsating whine.
I'll give your suggestion a try. Thanks for all your help!

Another question: 919's back rotor has slight groves in it.... that normal or should it be smooth?

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post #11 of 33 Old 09-22-2014, 10:49 AM
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Quote:
Originally Posted by 919FanWA View Post
Yeah, this sound it not steady, defiantly a pulsating whine.
I'll give your suggestion a try. Thanks for all your help!

Another question: 919's back rotor has slight groves in it.... that normal or should it be smooth?
Should be smooth - and now that you mentioned it, it may be the cause of your whine...

Does it disappear when applying the brake?

You might need new pads and even a new rotor if the groves are bad (or get the rotor turned, but a used rotor might be cheaper).

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post #12 of 33 Old 09-22-2014, 11:05 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
Should be smooth - and now that you mentioned it, it may be the cause of your whine...

Does it disappear when applying the brake?

You might need new pads and even a new rotor if the groves are bad (or get the rotor turned, but a used rotor might be cheaper).
New rotor, Ah poop.

Whine is there regardless of applying brakes.

I'll take it for a spin tonight and report back on exactly when Im hearing the sound. THANKS!

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post #13 of 33 Old 09-22-2014, 11:58 AM
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Quote:
Originally Posted by 919FanWA View Post
New rotor, Ah poop.

Whine is there regardless of applying brakes.

I'll take it for a spin tonight and report back on exactly when Im hearing the sound. THANKS!
If it is brake related, you can try and pry the pads out from the rotor (compress the piston) and then go for a ride - do NOT use the rear brake or press on the petal.

Then see if the sound persists. If it does, it's probably not brake related, but chain or wheel bearing.

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post #14 of 33 Old 09-22-2014, 08:30 PM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
If it is brake related, you can try and pry the pads out from the rotor (compress the piston) and then go for a ride - do NOT use the rear brake or press on the petal.

Then see if the sound persists. If it does, it's probably not brake related, but chain or wheel bearing.
Yeah, ok I'll try that.

Tonight I took the 9er down a hill with the engine off and in neutral..... Still made the whining sound.

Lifted the rear wheel and checked bearing for play. Tried moving wheel from side to side and up and down, no movement, no visible wear or excessive grease

While spinning rear wheel, Chain has a tight spot and a loose spot.... Is that normal?
Should I adjust chain slack on loose spot or tight spot?

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post #15 of 33 Old 09-22-2014, 09:36 PM
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Quote:
Originally Posted by 919FanWA View Post

While spinning rear wheel, Chain has a tight spot and a loose spot.... Is that normal?
Should I adjust chain slack on loose spot or tight spot?
That was going to be my first guess - irregular chain stretch. Time for a new chain. What was the tensile strength rating of your chain? A bike with this much grunt needs a chain with no less than 10k#. I get excellent service out of EK 530zzz rated at 11,100#.
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post #16 of 33 Old 09-23-2014, 03:37 AM
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Quote:
Originally Posted by Ken Phenix View Post
That was going to be my first guess - irregular chain stretch. Time for a new chain. What was the tensile strength rating of your chain? A bike with this much grunt needs a chain with no less than 10k#. I get excellent service out of EK 530zzz rated at 11,100#.
Interesting metric on the chain TS. I never noticed that value given for bike chains. Maybe I haven't been looking close enough to the specs.

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post #17 of 33 Old 09-23-2014, 03:50 AM
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The stock chains were too long and wore out (of adjustment) early, at least on the early models (If not all).

I replaced a few under warranty, but had to hold my mouth just right, the moon had to be in the right phase and the planets had aligned.

Do you have a passenger? If so, could the whine be coming from them?

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post #18 of 33 Old 09-23-2014, 05:11 AM
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I had one of the three bearings on the back wheel fail before 30k miles. I replaced all 3. You have 3 bearings. One may be failing and not show up on the wiggle test. Further, the "does it make the noise when the brakes are on or off" can also mask a bearing failure.

I say pull the rear wheel and inspect.

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post #19 of 33 Old 09-23-2014, 05:41 AM
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Quote:
Originally Posted by deandeib View Post
Interesting metric on the chain TS. I never noticed that value given for bike chains. Maybe I haven't been looking close enough to the specs.
IMHO tensile strength is THE most important spec. An 8,000# chain will stretch out quickly on a high torque bike. I'm opening a can of worms but I'll never understand the 520 conversion on anything other than a dedicated track bike - sacrificing longevity to save a few ounces.
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post #20 of 33 Old 09-23-2014, 07:19 AM
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Quote:
Originally Posted by Ken Phenix View Post
IMHO tensile strength is THE most important spec. An 8,000# chain will stretch out quickly on a high torque bike. I'm opening a can of worms but I'll never understand the 520 conversion on anything other than a dedicated track bike - sacrificing longevity to save a few ounces.
You're really going to hear some whining sounds now.

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post #21 of 33 Old 09-23-2014, 10:00 AM Thread Starter
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Quote:
Originally Posted by Ken Phenix View Post
That was going to be my first guess - irregular chain stretch. Time for a new chain. What was the tensile strength rating of your chain? A bike with this much grunt needs a chain with no less than 10k#. I get excellent service out of EK 530zzz rated at 11,100#.
ahhhhhh.... ....Don't know. Im guessing its the original chain due to low miles. Im the second owner of bike.

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post #22 of 33 Old 09-23-2014, 10:04 AM Thread Starter
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Quote:
Originally Posted by Steve View Post
The stock chains were too long and wore out (of adjustment) early, at least on the early models (If not all).

I replaced a few under warranty, but had to hold my mouth just right, the moon had to be in the right phase and the planets had aligned.

Do you have a passenger? If so, could the whine be coming from them?

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post #23 of 33 Old 09-23-2014, 10:09 AM
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Quote:
Originally Posted by marylandmike View Post
You're really going to hear some whining sounds now.


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post #24 of 33 Old 09-23-2014, 02:48 PM
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Quote:
Originally Posted by 919FanWA View Post
ahhhhhh.... ....Don't know. Im guessing its the original chain due to low miles. Im the second owner of bike.
I hear ya. My original chain was toast at 9,500 miles.
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post #25 of 33 Old 09-24-2014, 01:36 PM Thread Starter
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Quote:
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I hear ya. My original chain was toast at 9,500 miles.
Ken, what type of chain do you have and what about sprockets, size, type, brand ?

Im not an aggressive rider. Like to cruse around town mostly.

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post #26 of 33 Old 09-24-2014, 08:54 PM
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Quote:
Originally Posted by 919FanWA View Post
Ken, what type of chain do you have and what about sprockets, size, type, brand ?

Im not an aggressive rider. Like to cruse around town mostly.
EK 530zzz rated at 11,100#. http://www.amazon.com/dp/B0038RK7IW/...ter_B0038RM4K6

http://www.ekchain.jp/product/extreme_sport.html

Supersprox stock ratio 16/43. https://www.supersproxusa.com/Produc...n-a-budget.php

My current set has a bit over 3k of use and my axle is still all the way forward.
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post #27 of 33 Old 09-25-2014, 12:54 AM
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I had a similar sound coming from the back end of my 2005. It bothered me for about a thousand miles. When I was putting a new rear tire on, I found one of the bearings rusty and shot. It had no wiggle and felt smooth turning the tire by hand. The bike only had about 7500 miles on it, I live in a desert and don't ride in the rain. I suspect the previous owner, who only put 2500 miles on it, went a little overboard with the power washer. There's 3 bearings in the rear wheel.

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post #28 of 33 Old 09-25-2014, 09:31 AM Thread Starter
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Quote:
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I had a similar sound coming from the back end of my 2005. It bothered me for about a thousand miles. When I was putting a new rear tire on, I found one of the bearings rusty and shot. It had no wiggle and felt smooth turning the tire by hand. The bike only had about 7500 miles on it, I live in a desert and don't ride in the rain. I suspect the previous owner, who only put 2500 miles on it, went a little overboard with the power washer. There's 3 bearings in the rear wheel.
WOW. thanks for the info. I think I will replace FT/RR original tires, rear wheel bearings and chain/sprockets. If I still hear that sound I'll go NUTS!!

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post #29 of 33 Old 09-25-2014, 09:52 AM
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Quote:
Originally Posted by 919FanWA View Post
WOW. thanks for the info. I think I will replace FT/RR original tires, rear wheel bearings and chain/sprockets. If I still hear that sound I'll go NUTS!!
You could always get a belt driven Harley

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post #30 of 33 Old 09-25-2014, 09:54 AM
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Quote:
Originally Posted by 919FanWA View Post
WOW. thanks for the info. I think I will replace FT/RR original tires, rear wheel bearings and chain/sprockets. If I still hear that sound I'll go NUTS!!
If you can replace things one at a time so you'll know what caused the problem.

My rotor side wheel bearing died at 35k but never made a noise.
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post #31 of 33 Old 09-25-2014, 03:44 PM Thread Starter
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Quote:
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You could always get a belt driven Harley
Been there, done that.

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post #32 of 33 Old 09-25-2014, 03:51 PM Thread Starter
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Quote:
Originally Posted by Ken Phenix View Post
If you can replace things one at a time so you'll know what caused the problem.

My rotor side wheel bearing died at 35k but never made a noise.
Yes, over the up and coming rainy season, I'll replace a little at a time.

Should be fun! Like learning and doing my own maintenance.

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post #33 of 33 Old 09-25-2014, 03:52 PM
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Quote:
Originally Posted by EscapedLabRat View Post
Yep, first gear is a spline..........
Actually no.
It's a straight cut gear.
A spline is similar to a gear, but used to affix to a mating spline and lock down. Think brake/gear foot controls.

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