GL1200 sticking forks


Information and questions on GL1200 Goldwings (1984-1987)
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virgilmobile
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GL1200 sticking forks

Postby virgilmobile » Fri May 20, 2011 9:06 am



New to me,110k miles.oil replaced.forks move with bumps at slow driving,but are stuck when driving down the road.Front end bouncing,shocks don't move(float on the springs).The slider bushing is very hard to get back in and seems to bind to the fork pipe.Almost like it's too large.It's not new but may have been replaced by the PO.Do the bushings have to be trimmed to fit?Should the slider move full stroke without binding?My 1100 isn't much better.With no springs in it,It slides up and down easy but it still sticks while driving.It takes quite an effort to get them to move.

I also pushed the front end down then let it settle back up,marked the fork...lifted the front up and let it settle back down.I read it's suppose to be about a 1/2 inch.I get 3 inches.It just seems to jam up with the bikes weight.



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virgilmobile
Posts: 7647
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1200 sticking forks

Postby virgilmobile » Fri May 20, 2011 11:48 am

I got the feeling that the teflon bushings are bad.They don't have any brass showing but they are very very smooth surfaced(microscope viewed).The teflon surface seems to be flattened down.Theres no texture to the surface. I think that It's not allowing oil to mingle in the surface and letting the entire bushing to rub on the pipe squeezing out the oil and binding it.My 1100 will slide smooth until I put weight to it,then it binds.The 1200 seems to have the same problem.

To test my theory,I'm going to modify the teflon slides(I have to replace them anyways) by knurling the surface(very small detentes).This may reduce the contact area and allow oil to be retained on the surface of the slide thus reducing friction contact.It' one of those " in theory " ideas :roll:

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lbman
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Re: GL1200 sticking forks

Postby lbman » Fri May 20, 2011 11:54 am

my sliders move up and down without any resistance. I have done a lot of fork work of late.(not by choice mind you) I had 2 bent fork upper tubes. picked up 2 used ones from a buddy but one of them had rusted upper fork. I filed rust spots down, put in some new ATF fluid and progressive springs. the right one did good the left one is leaking like a siv. I ordered up seals and dust covers to replace them this weekend. had another buddy straighten not so bent fork, I will do away with rusted one and reinstall old fork upper.
I would pull them apart and see if they are bent. also check inside of lower tube to see if it's gouged.
something is not right there for sure.
someone with more technical background will hopefully jump in here soon and give you some specs. on what things should be. you can find used forks for these bikes pretty easy. and if they are bent a little they can be straightened . but they must be able to slide up and down easily .
hope this helps. but at least front forks are not so hard to take on and off...if you have not done it yet I would Order Progressive springs. You will love them for sure.
LB

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virgilmobile
Posts: 7647
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1200 sticking forks

Postby virgilmobile » Fri May 20, 2011 12:11 pm

They both have progressive springs.The tubes are true and straight.perfectly squared to the "T T T".The 1100 will (before the springs are installed) slide top to bottom with a finger.Look great,but as soon as you put a vertical load (remember the front is raked) it is very hard to get it to move.I think the slides are dragging under the angled force.If i follow the angle of the forks there smooth but straight up and down(like bumps) it won't hardly move.Hit a marker reflector or rocks and it works,but the slow shove just lifts the bike.

User avatar
virgilmobile
Posts: 7647
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1200 sticking forks

Postby virgilmobile » Fri May 20, 2011 12:14 pm

I got the feeling that the teflon bushings are bad.They don't have any brass showing but they are very very smooth surfaced(microscope viewed).The teflon surface seems to be flattened down.Theres no texture to the surface. I think that It's not allowing oil to mingle in the surface and letting the entire bushing to rub on the pipe squeezing out the oil and binding it.My 1100 will slide smooth until I put weight to it,then it binds.The 1200 seems to have the same problem.

To test my theory,I'm going to modify the teflon slides(I have to replace them anyways) by knurling the surface of the teflon(very small detentes).This may reduce the contact area and allow oil to be retained on the surface of the slide thus reducing friction contact.It' one of those " in theory " ideas :roll:




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