85 GL1200 has front pogo effect.


Information and questions on GL1200 Goldwings (1984-1987)
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peppilepew
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85 GL1200 has front pogo effect.

Postby peppilepew » Wed Aug 10, 2011 10:15 am



I have replaced the seals and refilled with 12 ounces of trans fluid. I have tried all 4 settings with little success. Forks were set at 6 psi. I removed all air and still have pogo. I am currently 240 lbs. Any suggestions other than losing a few pounds? :) Progressive springs?



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virgilmobile
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Re: 85 GL1200 has front pogo effect.

Postby virgilmobile » Wed Aug 10, 2011 10:57 am

As I understand front forks,there should be a hydraulic dampening affect to keep the wheel from rebounding(bouncing)fast.It would be like removing the shock on the car.the thing just bounces.That said,I found that a unlisted,not pictured part buried up in the bottom of the fork tube was broken on my 1100.

I tested my forks this way...I pulled everything off but the fork and slide.Including the spring(new springs won't help).
I lifted each slide up and pulled it down.A good fork had a lot of drag pulling it down,my fork just sloped up and down easily.
Now,with that test,I tried 30 weight motor oil,it helped but was still easy to draw down.I ended up rebuilding the dampening valve in the bottom of the tube.
It's not suppose to be removed as there is no listing for it and is considered a part of the fork assembly.
Well I did it anyway.It now has hydraulic dampening.Here's the best drawing I could make.
Attachments

peppilepew
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Re: 85 GL1200 has front pogo effect.

Postby peppilepew » Wed Aug 10, 2011 12:26 pm

Thanks, that makes sense. Where did you locate the parts? Riding season short here in the north so I may wait. I am also thinking a later model like an 1800.

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virgilmobile
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Re: 85 GL1200 has front pogo effect.

Postby virgilmobile » Wed Aug 10, 2011 1:40 pm

On my 1100 and 1200...There are no replacement parts.as far as anyone is concerned,they don't exist.
I had to grind 1/8 " off the bottom of the fork tube and tap the assembly out.
I measured the casting that was broken in 3 pieces and made one just like it.I bored the center hole just large enough to slide the piston tube through.

If the hole is too big,oil is compressed past it too fast,so I guessed just a little gap was OK.
I found that the right one was intact but badly worn.I measured 0.010" gap.It probably was run without oil in it.

The casting or dampener valve is a bit smaller than the holder to allow self alignment and has 4 groves on one side so the upward dampening is less than the downward.
The shocks (without springs)should go up with some hydraulic drag and down with quite a bit more.

Yes it was a difficult project.I probably spent 10 hours on it.Even tho another set may have fixed the problem,I just wanted to do it myself.And besides,would another 27 year old fork be in any better condition?

As a last resort,you could replace the ATF with heavier oil.It may stiffen it up where it doesn't bounce.Try 20 weight,then 30 weight,etc.(90 weight gear oil in mine :shock: )You'll know what works (without the springs)by lifting the front wheel and checking the downward hydraulic drag.I think,with the wheel on,mine took about 2 seconds to drop under its own weight.

Before repairs ,as soon as I let go of the wheel it would drop like it wasn't even hooked to the frame.

peppilepew
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Re: 85 GL1200 has front pogo effect.

Postby peppilepew » Thu Aug 11, 2011 4:53 pm

Are you a machinist? I am thinking along the same lines about 20+ year old parts.

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virgilmobile
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Re: 85 GL1200 has front pogo effect.

Postby virgilmobile » Fri Aug 12, 2011 8:50 am

Well lets just say 'been there,done that' .
Dad showed me how to fix stuff 40 years ago,it was all common sense.My brain processes information a bit differently than most.I see kind of like 3D images or X-ray pictures of what's described to me.It's annoying most of the time but it does help in my work in diagnosis.

wrightwing
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Re: 85 GL1200 has front pogo effect.

Postby wrightwing » Fri Aug 12, 2011 5:44 pm

COMMON SENSE 8-) Something this country and world is lacking today :!: I believe we are a dying breed :(
''NEVER TIME TO DO IT RIGHT, BUT ALWAYS TIME TO DO IT OVER''

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virgilmobile
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Re: 85 GL1200 has front pogo effect.

Postby virgilmobile » Sat Aug 13, 2011 8:25 am

I see this where I work.I refer to it as having trouble with the ABC's.
Step A. ..... do this....and that's where they stop....absolutly no ability to progress to step B.

peppilepew
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2012 GL1800 Level 3

Re: 85 GL1200 has front pogo effect.

Postby peppilepew » Mon Aug 15, 2011 9:01 am

I am owned by my transmission shop. I contract labor for swaps and see a future for this industry and many others that will end with a stupid work force. Much of it is caused by the entitlement attitude and the lack of motivation. Training is being provided for those that wish to better themselves on a very limited basis. Everything needed today seems to come in a ready to go black box. True craftsman are not created, they are born! A person either understands how and why or they don't. Show someone the way and from that point it is up to them to better themselves. On that note I am going to try the easy way with straight 30W oil. Keep the chin up, it is only going to get worse from here. :(

peppilepew
Posts: 387
Joined: Wed Jun 08, 2011 4:35 pm
Location: Plaistow, New Hampshire
Motorcycle: 2000 Gl1500 Se
2012 GL1800 Level 3

Re: 85 GL1200 has front pogo effect.

Postby peppilepew » Thu Aug 18, 2011 4:33 pm

75w90 synthetic it is.

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virgilmobile
Posts: 7663
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 85 GL1200 has front pogo effect.

Postby virgilmobile » Fri Aug 19, 2011 9:32 am

Yea,it's a good indicator the part in the fork is wallowed out.
I determined the fork should dampen like a car strut.Not as firm(weight difference) but similar.Thus the guess work.At least something is better than a uncontrollable bouncing.

GOOD work.At least it's safe ridable.

peppilepew
Posts: 387
Joined: Wed Jun 08, 2011 4:35 pm
Location: Plaistow, New Hampshire
Motorcycle: 2000 Gl1500 Se
2012 GL1800 Level 3

Re: 85 GL1200 has front pogo effect.

Postby peppilepew » Mon Aug 22, 2011 11:04 am

Thanks for the tip and picture. The pogo is very slight now but still there. In NH we have another 1.5 months of comfortable ride time. I plan on installing a poor boy alternator, getting the clutch 100% and rebuilding or replacing the front forks over the winter.




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