Harmonic Noise


Information and questions on GL1100 Goldwings (1980-1983)
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moneypit
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Motorcycle: 1983 GL1100I Interstate

Harmonic Noise

Postby moneypit » Mon Jul 21, 2014 6:57 pm



Ok I recently purchased a 83 Interstate all Hondaline fairings and bags . I had the carbs synced valves adjusted new plugs back tire. It has 80 k for mileage. It runs great rides great put 1500 miles on it so far . The problem I have is there is a high pitch noise that seems to radiate up from the fairing fork area its annoying as hell. The reason I think its a Harmonic is it only happens between 48 mph and 60 mph. I don't have a clue what it could be. If anyone has any idea it would be appreciated.



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WingAdmin
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Re: Harmonic Noise

Postby WingAdmin » Mon Jul 21, 2014 7:33 pm

Does the sound vary with the speed of the bike, or with the speed of the engine? If you are riding at a speed at which it occurs, if you pull in the clutch and allow the engine to return to idle, does the noise go away - even though the bike is still travelling quickly?

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RBGERSON
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had every year from 75 to 83

Re: Harmonic Noise

Postby RBGERSON » Tue Jul 22, 2014 8:29 am

+1 on above..two most likely sources tensioners or front hub/cable...
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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moneypit
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Re: Harmonic Noise

Postby moneypit » Tue Jul 22, 2014 9:28 am

At speed if I pull the clutch in and let the motor idle the noise doesn't change it does change with speed .

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moneypit
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Re: Harmonic Noise

Postby moneypit » Tue Jul 22, 2014 9:31 am

I changed the back tire to a Commander 2 the front is E 3 Dunlop the noise almost sounds like tire noise. Are E 3s noisy ..?

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WingAdmin
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Re: Harmonic Noise

Postby WingAdmin » Tue Jul 22, 2014 10:52 am

Well that leaves you with a few options:

- Tire noise
- Speedometer cable
- Wheel bearing

If you change the tire and the noise goes away, you have your answer. Wheel bearing can be checked for free play with your hands (lift bike so that front wheel is in the air, test it for movement laterally). If it's not tire noise, the most likely source is the speedometer cable. Try disconnecting the speedometer cable at the wheel end and temporarily (and firmly) secure the cable end to the fork with a wire tie. If the noise goes away, then it's the cable.

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moneypit
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Re: Harmonic Noise

Postby moneypit » Tue Jul 22, 2014 12:01 pm

wingAdmin thanx fo the reply ... I unhooked speedo cable noise didn't change.. checked for bearing slop its tight. What's the chance the noise is coming from the front tire. like I said its a Dunlop E 3 where do I measure tread depth on that tire.. I don't see ware bars..

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HawkeyeGL1200
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Re: Harmonic Noise

Postby HawkeyeGL1200 » Tue Jul 22, 2014 2:09 pm

The only noise I ever got out of an E3 was the ****, ****, ****, **** every time I cornered... and the noise came from the rear. That doesn't mean yours isn't making an annoying Trouble with the E3 is, it also has given me *BY FAR* the best miles out of a rear tire I ever had...

By the way, my money was on timing belt tensioners, until you said the sound didn't change after pulling the clutch in and letting RPMs run back down... then I was certain it was speedo cable... Now, I have no clue. The only noise I ever got out of a front wheel bearing was a snapping and popping sound as it ejected ball-rollers out the left side...

I do know that dust on a disc brake rotor can make an annoying squeel if brakes are applied lightly... I don't suppose it has anything to do with brakes, though.

I'd try riding with ear plugs in to see if it helps isolate the sound a little to make it easier to determine the source.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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moneypit
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Re: Harmonic Noise

Postby moneypit » Tue Jul 22, 2014 6:02 pm

Thanx Hawkeye after thinking about it tire noise doesn't go away like this noise does . It could be brakes but I doubt it. it starts around 48 and ends around 60 . It sucks..

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redbug
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Re: Harmonic Noise

Postby redbug » Tue Jul 22, 2014 9:05 pm

I have the same problem, and read what jp98226 found out. Its a great story and it will leave you laughing. Plus he solved the problem.
" Ridin on Tulsa Time "

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moneypit
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Re: Harmonic Noise

Postby moneypit » Wed Jul 23, 2014 2:04 pm

Ok so I have been trying different things to eliminate the noise coming from the front of my bike. Well I took it for a ride not warring my new Bell Mag 9 Sena and I don't hear any noise . I wore my Scorpion exo 500 and the noise was back but because its a full face the noise was less noticeable. Went for another ride helmetless and once again no noise. Very strange but at least there's nothing wrong with the wing. thanks for the replies and I will be getting some ear plugs... lol

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WingAdmin
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Re: Harmonic Noise

Postby WingAdmin » Wed Jul 23, 2014 7:39 pm

dansarchery wrote:Ok so I have been trying different things to eliminate the noise coming from the front of my bike. Well I took it for a ride not warring my new Bell Mag 9 Sena and I don't hear any noise . I wore my Scorpion exo 500 and the noise was back but because its a full face the noise was less noticeable. Went for another ride helmetless and once again no noise. Very strange but at least there's nothing wrong with the wing. thanks for the replies and I will be getting some ear plugs... lol


Never even considered the helmet as a source of noise! :)

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HawkeyeGL1200
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Re: Harmonic Noise

Postby HawkeyeGL1200 » Thu Jul 24, 2014 11:45 am

I have begun to wear soft ear plugs when I ride after reading an article about lost hearing as a result of wind noise at highway speeds. They do eliminate a lot of distracting sounds when riding, yet I am still able to hear the engine quite well. I guess your harmonic sound was whistling of the air around the helmet?
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Harmonic Noise

Postby WingAdmin » Mon Jul 28, 2014 12:20 pm

HawkeyeGL1200 wrote:I have begun to wear soft ear plugs when I ride after reading an article about lost hearing as a result of wind noise at highway speeds. They do eliminate a lot of distracting sounds when riding, yet I am still able to hear the engine quite well. I guess your harmonic sound was whistling of the air around the helmet?


I have pretty decent hearing damage from misspent years in my youth working as a club DJ, so I tend to protect what I have left pretty strongly - so I have worn ear plugs when riding for many years. I used soft ear plugs for many years, but switched to custom-molded silicone ear plugs about three years ago. They're far superior, and fit perfectly every time.




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