LinkBack Thread Tools
post #1 of 57 (permalink) Old 03-07-2005, 01:29 AM Thread Starter
Junior Member
Join Date: Mar 2005
Location: Dunedin, , New Zealand
Posts: 6
Post imported post

Hi folks,

My 86 GL1200i has developed a very coarse vibration at around 2500 rpm over the past three weeks. It is worse under load both accelerating or engine breaking and doesn't seem related to transmission or running gear (does the same in neutral and with clutch disengaged) any thoughts greatfully received.

Extra info, high milage (206,000miles) runs like a dream except the vibration, starts first time, petrol consumption and performance unchanged, cam belts done last 20,000 ago, no oil burning

Many thanks


My other bikes are Wings, any surprise I\'m smiling
otagobob is offline  
Sponsored Links
post #2 of 57 (permalink) Old 03-07-2005, 02:42 AM
Senior Member
JDuggan's Avatar
Join Date: Jul 2004
Location: , , Ireland
Posts: 316
Post imported post

It sounds like you've already ruled out the engine and gearbox. If you are gt#etting the vibes in neutral and clutched in, I'd sayyou should be looking at the driveshaft UJ. When that wears you can get terrible vibration.

Joe Duggan
JDuggan is offline  
post #3 of 57 (permalink) Old 03-07-2005, 04:24 AM Thread Starter
Junior Member
Join Date: Mar 2005
Location: Dunedin, , New Zealand
Posts: 6
Post imported post

Thanks Joe,

What I mean't to say was that the vibration occurs with the engine running whilst it is parked up in neutral, comes in as the revs hit 2500rpm, it is worse however with the bike running when the engine is under load, do you think it can still be the drive train?

I was wondering if there are any engine internals which are known to cause this, funny thing is, the vib dissapears once the ol girl gets up to about 3000 rpm and is good as gold after this

regards Bob Saunderson

My other bikes are Wings, any surprise I\'m smiling
otagobob is offline  
post #4 of 57 (permalink) Old 03-07-2005, 08:55 AM
Senior Member
Shooter's Avatar
Join Date: Jul 2004
Location: New Castle, Pennsylvania, USA
Model: 2006 ST 1300
Posts: 3,637
Post imported post

1st off, welcome to the forum. With that many miles on your friend, when was the last time you checked all the engine mounts. Just a thought...

For those who've never fought for it, the price of freedom shall never be known.... Shooter (2Late45)

1986 Interstate, 2006 ST 1300
Shooter is online now  
post #5 of 57 (permalink) Old 03-07-2005, 09:43 AM
Senior Member
Join Date: Dec 2004
Location: , , USA
Posts: 1,383
Post imported post


RedWinger is offline  
post #6 of 57 (permalink) Old 03-07-2005, 01:18 PM
Senior Member
philcsand's Avatar
Join Date: Jan 2005
Location: Tukwila, Wa, Washington, USA
Posts: 510
Send a message via AIM to philcsand Send a message via Yahoo to philcsand
Post imported post

Check the torque on all engine mounting bolts.My Clymer manual says that is the #1 place for vibes to show up.

My Toys:
1984 GL1200 - Nothing\'s broken... HOLY CRAP!
1980 KZ750-4 - Sold
1989 Catalina 22 -Sold
2007 Crappy Chinese made 50cc scooter - More fun than it should be.
philcsand is offline  
post #7 of 57 (permalink) Old 03-07-2005, 01:36 PM
Join Date: Jan 2005
Location: St Marys, Ohio, USA
Posts: 596
Post imported post

Throw a timing light on. See if it winks out at the problem speed. Vibes are caused when the crank is out of balance (bearing hanging up or combustion forces not equal) or something in a valvetrain seizing or clutch basket bearings bad. The rest of the system is disconnected through the clutch. That it only shows at 2500 doesnt sound like oiling system, pressure would be less as speed decreases, not as it increases. But with that many miles, an oil pressure test wouldnt hurt. Can do a cheap one by letting it idle then dropping the idle speed slowly and see if the light winks on above 400 RPM.

3 places to listen to the internals 1.) oil fill cap 2.) timing mark access plug 3.) stator drive bolt plug

If you go to wits end without finding it, make a recording and Email it to me, I can try to calculate the vibration frequency and make an educated guess as to where its coming from.
Dave Campbell is offline  
post #8 of 57 (permalink) Old 03-07-2005, 01:53 PM
Senior Member
JOHNO's Avatar
Join Date: Sep 2004
Location: Portland Dorset, , United Kingdom
Posts: 554
Send a message via AIM to JOHNO Send a message via MSN to JOHNO
Post imported post

Hi Bob,

something else to check is that one of the coils may be failing pull the plug caps, front cylinders then rear see if it makes a differance to engine note,

I've just had a similar problem with a broken primary wire to a coil. ( Miss fireing under load)

1984 GL1200 Aspencade with 1966 Watsonian Palma sidecar
1984 GL1200 Interstate engine out and awaiting waterpump and frame repair
2012 Royal Enfield 500 EFI Bullet (daily ride)
1998 Reliant Robin LX estate (for when it rains)
1992 Reliant Robin saloon (if the other breaks down!)
JOHNO is offline  
post #9 of 57 (permalink) Old 03-07-2005, 02:23 PM
Senior Member
Join Date: Jul 2004
Location: Franklin, Massachusetts, USA
Posts: 1,148
Post imported post

Pull a compression test of all 4 cylinders.. A vibration can be caused by just about anything from a loose wire, fastener, engine mount, weak cylinder, fuel feed, spark plug.. The list goes on and on..

By process of elimination, and suggestions from this board, you'll isolate the problem and be able to fix it..

With the cylinders all up to the correct compression, the engine is basically o.k... Look at the spark plugs,, what color are they? Is one or two a different color than the rest? Did this vibration just happen, or has it been coming on for a while? Secondary ignition systems can break down at certain rpms, causing a misfire in one or two cylinders which would cause a vibration... Keep digging and keep us posted on what you have for specs...

Welcome to the nest.

Old Nam Vet
LZ English 66 - 67
New \'08 Titanium Nav
I\'m old and wise, but was once young and stupid.
Renegade is offline  
post #10 of 57 (permalink) Old 03-08-2005, 12:05 AM Thread Starter
Junior Member
Join Date: Mar 2005
Location: Dunedin, , New Zealand
Posts: 6
Post imported post

Thanks very much folks, what a fantastic forum, you've certainly given me some thoughts to get on with. I imagine I will be spending the next week of evenings in the workshop, and will work through things one at a time.Hopefully I can share some of my thoughts in answer to other peoples annoyances as well

all the best Bob

My other bikes are Wings, any surprise I\'m smiling
otagobob is offline  

  Steve Saunders Goldwing Forums > Forums > Goldwing Technical Forum

Quick Reply

Register Now

In order to be able to post messages on the Steve Saunders Goldwing Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
GL1200 Low rev range vibration clarky General Motorcycle Discussion Forum 1 08-06-2014 06:45 AM
GL1200 Driveline Vibration linux2 Goldwing Technical Forum 3 07-30-2012 07:29 PM
Vibration on my 1986 gl1200 sei bigted$$ Goldwing Technical Forum 8 04-01-2011 07:01 AM
Vibration GL1200 BigWorm Goldwing Technical Forum 2 10-06-2009 02:54 AM
GL1200 vibration sprite123 Goldwing Technical Forum 14 08-05-2008 07:12 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome