Gl1500 Rear tail wag/shimmy


Information and questions on GL1500 Goldwings (1988-2000)
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eightball1013
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Joined: Tue Jul 19, 2022 10:37 am
Location: 90275
Motorcycle: 1998 Gl1500 SE

Gl1500 Rear tail wag/shimmy

Post by eightball1013 »



I recently took my GL1500 to dealership before winter struck! They installed new rotors and pads, new all balls wheel bearings, new rotor/pads, new wheel dampeners, and a new Shinko rear touring tire for GL1500. Now upon driving it no matter what speed I feel the rear end wag/shimmy the faster I go more pronounced! I need help diagnosing it! PLEASE!

1. Put up on center stand wiggle to feel for bearing play = saw or notice none
2. eyeballed wheel for wobble none noticed - thinking about getting a white chalk on a fixed stand get it about a mm away from tire and spinning to check wheel runout not tried this yet
3. eye balled front tire alignment, from my bad eyesight seems fine - would like to know how to check it more precise.

so, to reiterate: NEW Shinko rear tire, new wheel bearings, new wheel dampener, new rotor and pads.

Anyone have this issue? Any ideas to figure it out? I she Shinko's have a bad rep, but its all I ever ran for years. I do not know if they balanced it, but they said they would. But it IS a distinct side wag/motion coming from the rearend and front seems stable. Thanks, Bryan


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Rambozo
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Re: Gl1500 Rear tail wag/shimmy

Post by Rambozo »

What is your rear tire pressure? What you describe is often caused by low rear tire pressure.
eightball1013
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Re: Gl1500 Rear tail wag/shimmy

Post by eightball1013 »

Thank you kindly! Rear pressure I did play with and tried pressure between 32-42 when trying to remedy. It made no difference, I even had the bike on my center lift jack and checked the front and rear bearings (even though the rear bearings were new” for any kind of play. It feels like the tail is wagging the dog after about 30mph it I can feel the rear end go side to side. While have the bike on center stand I put it in 1st so the tire would spin. Got dead straight behind it and did not notice a wheel wiggle. This of course does not mean there is not! I thought next to trouble-shoot I would take my little vice and attach a chalk pen position it just as close I can get it then spin tire by hand to see if the tire is true. If so many things were not changed at one time it would be easy to diagnose. This is the first time I let someone else do the work for me! I did take it to the dealership I bought it from in 1998. Unfortunately, too hard me due bad arthritis I can’t change the tire anymore with spoons. Crossed my mind maybe they did not seat the bearing properly but it’s not evident. Tires are expensive with labor to just throw money at it.
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blupupher
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Re: Gl1500 Rear tail wag/shimmy

Post by blupupher »

Air pressure is the first thing I thought of as well, had issues with mine when I went to a car tire and had too low a pressure in the rear. What was your front tire pressure?

Since that is OK, my next thought is the steering bearings are not tightened correctly.

Also make sure all the rear spacers are installed correctly on the rear tire, it could put the tire out of alignment from the front and cause an issue.
Current ride: 2013 BMW K1600GT

Former rides: 2002 GL1800A, 2001 CB750, 1994 GL1500 SE, 1994 VT1100C , 1984 VF500F, 1982 CB750C, 1982 GS250T, 1981 CB900C, 1978 CB125s, 1976 TS185
eightball1013
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Motorcycle: 1998 Gl1500 SE

Re: Gl1500 Rear tail wag/shimmy

Post by eightball1013 »

Yes thank you! I agree! I checked the head bearings they are perfect! I checked tire pressure and gone to the extent of lots of adjusting with same issue as outcome! I did think about the wheel spacers on incorrectly but have not looked at it very closely yet. The front tire was not changed. Only the rear. It would be easy to figure out if the tire was the only thing changed, but I had them do everything. Rear bearing, rotors, pads, rubber wheel dampeners, and of course a Shinko tire. It ran like a dream with the worn tire. So something from the reared service is the problem. The tire, bearings not seated, spacers in wrong, dampeners, not to mention new rotor, pads , and screws. I do not know if the balanced the rear tire for sure! I can only assume. But tail wagging is the issue. I would guess the tire is bad? Not true but just with my eyeballs it looks good.
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blupupher
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Re: Gl1500 Rear tail wag/shimmy

Post by blupupher »

I would get the tire re-balanced.
Go to the shop and explain what is going on, hopefully they are a good shop and will investigate it without ripping you off.
It could be a bad tire though, something internally wrong with the tire that you can't see.
Current ride: 2013 BMW K1600GT

Former rides: 2002 GL1800A, 2001 CB750, 1994 GL1500 SE, 1994 VT1100C , 1984 VF500F, 1982 CB750C, 1982 GS250T, 1981 CB900C, 1978 CB125s, 1976 TS185
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WingAdmin
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Re: Gl1500 Rear tail wag/shimmy

Post by WingAdmin »

Check the tire mount on the wheel. You will see molded lines in the rubber that are right next to the rim:

Image

Rotate the tire and make sure that the distance between those molded lines and the rim are exactly the same as the wheel turns - on both sides. If not, then the tire was not mounted properly.

Also look at the tire from behind while it is rotating. Make sure the tread pattern stays solid and does not move from side to side. If it appears to move from side to side as the wheel turns, it can mean an improperly mounted tire or a defective tire.

Also check the swingarm pivot bearings - make sure there is no free play of the swingarm from side to side when the bike is on the center stand.
eightball1013
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Joined: Tue Jul 19, 2022 10:37 am
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Motorcycle: 1998 Gl1500 SE

Re: Gl1500 Rear tail wag/shimmy

Post by eightball1013 »

Thank you! Did not think about swingarm bearings. Will check it out! I did get the dreaded vibration when not under load. So I ordered a driveshaft took me 2 months to get. Still waiting on boot! Thanks for creating this website!!!
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blupupher
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Re: Gl1500 Rear tail wag/shimmy

Post by blupupher »

WingAdmin wrote: Tue Feb 13, 2024 10:29 am Check the tire mount on the wheel. You will see molded lines in the rubber that are right next to the rim:

Image

...
LOL, I saw the pic before reading and was like get ride of that tire, it is way too old.
Then realized who posted it and it is an old pic.
Current ride: 2013 BMW K1600GT

Former rides: 2002 GL1800A, 2001 CB750, 1994 GL1500 SE, 1994 VT1100C , 1984 VF500F, 1982 CB750C, 1982 GS250T, 1981 CB900C, 1978 CB125s, 1976 TS185
eightball1013
Posts: 30
Joined: Tue Jul 19, 2022 10:37 am
Location: 90275
Motorcycle: 1998 Gl1500 SE

Re: Gl1500 Rear tail wag/shimmy

Post by eightball1013 »

I finally got out to my garage to inspect that rear tire very closely! The lines around the tire that Wingadmin pointed out are nowhere even all the way around the tire. as anyone tried to get those guidelines straight without removing the tire. on the left side I can't even see the lines, and on the right the lines are in and out uneven. The dealership mounted the tire incorrectly it seems. I have a motion pro bead breaker I think will work for this!




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