Vibration when accelerating


Information and questions on GL1200 Goldwings (1984-1987)
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ripsaw
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Location: Rhondda, South Wales.
Motorcycle: 1986 1200 Aspencade

Vibration when accelerating

Postby ripsaw » Wed Feb 22, 2012 7:24 am



I've just bought a 1986 Apencade. I've found when accelerating there's an annoying vibration as though an engine mounting bush is missing. It eventually goes by either easing off the throttle and gently easing it back on, or increasing the throttle gently whilst it vibrates and it passes. This can't be right, does anyone have any idea of what it could be? :?:



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virgilmobile
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Re: Vibration when accelerating

Postby virgilmobile » Wed Feb 22, 2012 7:37 am

I guess that the motor mounting bolts could be loose,or even something related to the driveshaft,however mine growls at me around 1000-1200 rpm.I just need to sync the carbs again.

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D2D
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Re: Vibration when accelerating

Postby D2D » Wed Feb 22, 2012 7:41 am

More info .. front of the bike or rear. Could be a number of things .. loose or broken or even missing engine mounts, bad wheel bearings, bad swing arm bushings and bearings, unbalanced tires, bad final drive etc. At what speeds does it start and go away ? What if anything have you checked to narrow it down?

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mervk
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Re: Vibration when accelerating

Postby mervk » Wed Feb 22, 2012 7:42 am

If the vibration is constant at a certain speed range, that is, at a certain speed it starts, then keep accelerating and it always goes at a set higher speed, then I would suspect you've thrown a wheel weight, and need the wheels balanced.

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poffutt
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Motorcycle: 1984 Goldwing Interstate GL1200

Re: Vibration when accelerating

Postby poffutt » Wed Feb 22, 2012 1:36 pm

I am a newby to Goldwings and shaft drive. But with my Ford Bronco I am an expert. twice I have had to change u-joints in the drive shaft. The symptoms are exacaly as you describ. When giving it gas you get a viberation. When you let off the vibration goes away. if my Gold wing was acting like this, the first thing I would check would be the drive shaft u-joints.

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WingAdmin
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Re: Vibration when accelerating

Postby WingAdmin » Wed Feb 22, 2012 4:04 pm

It sounds like vibration from the primary chain, the massive chain that connects the engine to the transmission. If the carburetors are out of sync, the uneven power pulses from the cylinders set up a resonant vibration in the chain at lower RPM, particularly under high load (think lugging the engine going up a hill in too high a gear). The end result is a lot of vibration, sometimes sounding like a box of nuts and bolts rattling around inside there.

The solution is to do a carb sync.

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detdrbuzzard
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Re: Vibration when accelerating

Postby detdrbuzzard » Thu Feb 23, 2012 6:58 am

if it the engine you might need a carb sync
'99 ST1100, '93 se
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ripsaw
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Location: Rhondda, South Wales.
Motorcycle: 1986 1200 Aspencade

Re: Vibration when accelerating

Postby ripsaw » Thu Feb 23, 2012 8:36 am

Thanks for all the info, I'll give a little more myself. My bike was in the garage for about 2 months end November 2011 to end of Jan 2012. The bike was in for a MOT, carb balance and I had another problem of both tyres going flat within a week. The vibration was there before the bike went in and seems a little bit better now. I'm assuming the wheels were removed (the back one in any event as I needed a brake disc for the MOT) to have cleaned them up and sorted them out.

The vibration seems to start when I'm just cruising along at any constant speed and then apply the throttle. But on saying any constant speed, I'm meaning mainly lower speeds around town and bypasses (30 - 40 mph) Once it passes the vibration it's fine until I want to accelerate again. Other than that it seems to run reasonably well for the age of it.

ripsaw
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Re: Vibration when accelerating

Postby ripsaw » Mon Feb 27, 2012 7:41 am

D2D wrote:More info .. front of the bike or rear. Could be a number of things .. loose or broken or even missing engine mounts, bad wheel bearings, bad swing arm bushings and bearings, unbalanced tires, bad final drive etc. At what speeds does it start and go away ? What if anything have you checked to narrow it down?


More of a problem at lower speeds, the vibration feels like it's coming through the seat.

ripsaw
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Re: Vibration when accelerating

Postby ripsaw » Mon Feb 27, 2012 7:52 am

WingAdmin wrote:It sounds like vibration from the primary chain, the massive chain that connects the engine to the transmission. If the carburetors are out of sync, the uneven power pulses from the cylinders set up a resonant vibration in the chain at lower RPM, particularly under high load (think lugging the engine going up a hill in too high a gear). The end result is a lot of vibration, sometimes sounding like a box of nuts and bolts rattling around inside there.

The solution is to do a carb sync.


The vibration feels like it's coming through the seat, and it does sound like a box of nuts and bolts rattling around, but the carbs have been balanced (well at least I paid for them to be balanced)

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WingAdmin
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Re: Vibration when accelerating

Postby WingAdmin » Mon Feb 27, 2012 9:43 am

It really sounds like the carb balance/chain problem. My 1100 will still do it when the carbs are perfectly balanced, but only at very low RPM and high throttle settings. The better quality (more accurate) carb sync, the less likely the noise is to happen. You might want to have a look at getting the carbs synced again. They're very touchy and really have to be done well.

ripsaw
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Re: Vibration when accelerating

Postby ripsaw » Tue Feb 28, 2012 11:27 am

WingAdmin wrote:It really sounds like the carb balance/chain problem. My 1100 will still do it when the carbs are perfectly balanced, but only at very low RPM and high throttle settings. The better quality (more accurate) carb sync, the less likely the noise is to happen. You might want to have a look at getting the carbs synced again. They're very touchy and really have to be done well.

What's involved with a carb sync? Can it be done DIY? I also find my wing is a little thirsty.

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WingAdmin
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Re: Vibration when accelerating

Postby WingAdmin » Tue Feb 28, 2012 12:55 pm

ripsaw wrote:What's involved with a carb sync? Can it be done DIY? I also find my wing is a little thirsty.


Have a look at: How to synchronize your carburetors

jwhpostal
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Re: Vibration when accelerating

Postby jwhpostal » Mon Aug 18, 2014 10:04 am

I'm having the exact issue with my 85 LTD. Did you ever figure out what caused it. I've synced the carbs and it didn't help bit. I've isolated the vibe to the engine because by dragging the clutch while stopped I can get it to "growl". I'm thinking it has to be a worn bearing somewhere like maybe the clutch basket is deflecting under torque and rubbing the housing.




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