1986 GL1200 Interstate Tank Slapper


Information and questions on GL1200 Goldwings (1984-1987)
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Redwinger8
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1986 GL1200 Interstate Tank Slapper

Postby Redwinger8 » Wed Sep 02, 2015 3:08 pm



ok here it is I figured out the way it happens need to figure out how to fix it. I get up to speed than take the hand off the throttle and BAM one wild ride.

I have put a new front tire on as well as new front wheel bearings my mechanic has checked the steering bearings, swing arm and the rear wheel baring all tight. air pressure all the way around suspension and tires so now what????? :?:


Last edited by Redwinger8 on Wed Sep 02, 2015 3:24 pm, edited 1 time in total.

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Re: 1986 GL1200 Interstate Tank Slapper

Postby WingAdmin » Wed Sep 02, 2015 3:16 pm

Is it at all speeds, or does it occur only when decelerating through certain speeds?

If it is that sensitive, then something is loose. When the steering bearings were checked, did he check the resistance of the steering head to make sure they are torqued correctly? If the steering head bearings are aftermarket, they might need to be torqued a bit more than usual, which will help dampen oscillations.

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Redwinger8
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Redwinger8 » Wed Sep 02, 2015 3:21 pm

pretty much all speeds at deceleration and one hand ( I know keep both hands on the stick and problem solved ) as soon as you loosen the grip WABBBBBBLLLLLLL it has my mechanic scratching his head and me changing my pants :o

TN-GL
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Re: 1986 GL1200 Interstate Tank Slapper

Postby TN-GL » Wed Sep 02, 2015 9:25 pm

Did you check the balance of your wheel with your old tire ? And did you balance your wheel assembly with the new tire ?

When I started checking wheel balance on my bikes I was amazed at how far out most wheel assemblies are. I use the "Tusk" brand wheel truing and balancing stand and the stick on type wheel weights. Once you are sure of wheel balance, then you can check head bearings, for brakes dragging and etc.

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Re: 1986 GL1200 Interstate Tank Slapper

Postby WingAdmin » Thu Sep 03, 2015 9:57 am

Was the bike ever crashed? Have you checked alignment between the front and rear wheels?

Oh, also check the condition of your forks. If they are loose and sloppy, they can definitely be the cause.

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Redwinger8
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Redwinger8 » Thu Sep 03, 2015 3:52 pm

supposedly no on the crash no real idea no apparent booboos
not sure what you mean as far as alignment

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Re: 1986 GL1200 Interstate Tank Slapper

Postby WingAdmin » Fri Sep 04, 2015 1:37 pm

Redwinger8 wrote:supposedly no on the crash no real idea no apparent booboos
not sure what you mean as far as alignment


Alignment between the two wheels - are they in line with one another?

Wheel alignment
Wheel alignment

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SeaBee23
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Re: 1986 GL1200 Interstate Tank Slapper

Postby SeaBee23 » Fri Sep 04, 2015 3:07 pm

My 87 Interstate does the exact same thing, I am going through the whole front and rear currently to see if I can find an explanation. Please send me a pm if you figure it out in addition to this thread.

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Slick Willi
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Slick Willi » Sat Sep 05, 2015 2:07 pm

I have an 87 1200interstate that does the same thing, and have read others with same. Apparently this is common with the goldwing. I just do like the others, keep at least 1 hand on the bars, no more wobble. I would like to see someone explain this phenomenon though :roll:
Slick Willi 8-)

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Redwinger8
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Redwinger8 » Fri Sep 18, 2015 8:32 pm

okay update took it to a some what local (nice 1.5 hour drive) front end specialist and he drove it said definitely head related did the normal test got the same as my local mechanic dint point the finger at the head bearing. so he 99.9 percent assured me that's what it was even though we got that. He also said unrelated but my front shocks where junk I knew that as its like riding a Pogo stick. so hes going to due a full service to the shocks and hes putting stiffer springs in with all new bushings should be nice found the lower bearing was loos and the bearing worn so it should be all set when I get her back :D
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SeaBee23
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Re: 1986 GL1200 Interstate Tank Slapper

Postby SeaBee23 » Fri Oct 23, 2015 3:29 pm

Have you gotten to see if that fixed the issues?

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Aussie81Interstate
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Aussie81Interstate » Fri Oct 23, 2015 4:28 pm

Looks like steering head bearings need to be serviced/replaced hard to tell the damage on that picture, but I think you have found your problem

Crappy first mechanic and the solutions is a good second mechanic

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Redwinger8
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Re: 1986 GL1200 Interstate Tank Slapper

Postby Redwinger8 » Sun Oct 25, 2015 11:45 am

Well yes it fixed it for like 1300 miles but just got it again however I believe a torquing should fix it and in Defense of the first Mechanic he told me he believed even though all the " tests" didn't point to it the problem did and the fix wouldn't be cheap enough to go ahead we should keep looking and the second mechanic found the same to be true however being a front end specialist he was confident that it would fix the issue and went as far as guaranteeing it. I have every confident in my first mechanic and he knows my financial situation so he opted we keep looking for another issue and I concurred, it was safe as long as I didn't take both hands off the wheel lol.

I went from Massachusetts thru New Hampshire all the way up RT 100 in Vermont and back 853 mile trip towing my HF tag along trailer and the wife with out any issues what so ever the old girl drove like a champ in her prime that is why I'm thinking it just needs to be re torqued. I will let you know if the torque fixes it again I'm fairly certain it will thanks for all your help and I hope this helps others :D


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Re: 1986 GL1200 Interstate Tank Slapper

Postby deanbw » Sun Oct 25, 2015 11:55 pm

I use the "fall off" method when I do my headstock bearings. With the front wheel off the ground, and no cables, hoses restricting movement ( take clutch, brake, throttle off bars and let hang).
From center turn bars and take note of point where bars fall away on their own. Tighten bearings until you can turn bars 5inches before they fall away, it may be exact right to left but it should be close.
I have done this method with every bike I've owned and never had a wobble problem.....well once when I had a bent reverse comstar wheel on a cx500c but I cant blame that on bearings.

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deanbw
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Re: 1986 GL1200 Interstate Tank Slapper

Postby deanbw » Tue Oct 27, 2015 12:03 pm

deanbw wrote:I use the "fall off" method when I do my headstock bearings. With the front wheel off the ground, and no cables, hoses restricting movement ( take clutch, brake, throttle off bars and let hang).
From center turn bars and take note of point where bars fall away on their own. Tighten bearings until you can turn bars 5inches before they fall away, it may be exact right to left but it should be close.
I have done this method with every bike I've owned and never had a wobble problem.....well once when I had a bent reverse comstar wheel on a cx500c but I cant blame that on bearings.

Sorry , should be "may NOT be exact"

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Re: 1986 GL1200 Interstate Tank Slapper

Postby julimike54 » Wed Oct 28, 2015 8:18 am

So has anyone used the spring scale method to check the amount of force it takes to turn bars, this is how Honda manual describes. If you have where did you find the spring scale, in need of getting one.
Thanks
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Re: 1986 GL1200 Interstate Tank Slapper

Postby WingAdmin » Wed Oct 28, 2015 9:12 am

julimike54 wrote:So has anyone used the spring scale method to check the amount of force it takes to turn bars, this is how Honda manual describes. If you have where did you find the spring scale, in need of getting one.
Thanks


You can get them from Amazon: http://www.amazon.com/gp/product/B0039Y ... ingdocs-20

That said, whenever I have used the Honda spring scale method of adjustment, I always end up with a steering head that is too loose, and susceptible to head shake and speed wobble.

This is especially the case if you install aftermarket (i.e. tapered) bearings. I end up tightening it to almost twice what Honda recommends in order to get the correct amount of dampening.

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Re: 1986 GL1200 Interstate Tank Slapper

Postby geraldm » Sun Nov 01, 2015 10:29 pm

Back to the question asked (does anyone know why the wings are so susceptible to wheel wobble) this is just my thoughts but I believe the track front end that came out somewhere around in the early 80's which was actually designed for the Saber for the big comeback in road racing by Honda.. which they ended up doing very well. Was never at the time intended for the big brutes that it ended up on adding much more weight than was designed for. I used a trac front fork set on my twin rotary engine drag bike engineered at 48 degree. Rake and never a quiver at any speed. My thoughts are that the trac front fork is not designed for our big boys . I believe the over torque on the neck brgs is just a cheap fix they came up with to try to correct the problem. These bikes seem to have a very minimal rake which would add to the problem. Although at the same time giving very good control for cornering and handling in general and the big buggers do handle well when stressed. Just my thoughts.

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Re: 1986 GL1200 Interstate Tank Slapper

Postby artw45 » Wed Nov 04, 2015 7:38 am

My 84 has some issues that way, have to have a steering stabilizer when the sidecar is attached. Without the sidecar mostly getting porpoising in the corners at times. Need to do a front-end tear down on it, my 2005 VTX 1800 needs it also, going to be a long winter.

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Re: 1986 GL1200 Interstate Tank Slapper

Postby julimike54 » Fri Jan 29, 2016 8:43 am

Just an update...got the spring scale & found the load to move bars @ 400g (spec 500-650g). Tightened it up and the hands off wobble is gone..wooohooo 8-)


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