Really bad shaking at deceleration. - Steve Saunders Goldwing Forums

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post #1 of 23 (permalink) Old 11-10-2007, 08:08 AM Thread Starter
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Hey guys. On the blue 1978 GL1000, It cruises just fine with a very little viberation at or about 55. But as I climb the clock up to 60-70 the viberation gets a little worst and when I decelerate the shudder and viberation is so bad that it takes a lot of concentration to keep it up. Now, some history: the has a vetter fairing with no weight and the front tire does not spin freely. Any thoughts?????

BTW: I will be off line until Sunday afternoon. So I will be unable to answers questions until then.

~teacher~~~

~Butch~~~
1983 GL1100A,Wineberry
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post #2 of 23 (permalink) Old 11-10-2007, 08:16 AM
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Bad tires, Bad wheel bearings, Tire way out of balance, Draging brakes. Loose swingarm. You gonna have to go through a check list and eliminate things..

Bob..KF4GP
If it ain\'t broke, fix it till it is!

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86 R80RT
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post #3 of 23 (permalink) Old 11-10-2007, 11:21 AM
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retiredintime wrote:
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Bad tires, Bad wheel bearings, Tire way out of balance, Draging brakes. Loose swingarm. You gonna have to go through a check list and eliminate things..
Yeah...and warped rotor(s), bad U-Joint at the swing arm, shaft splines, or maybe (I can't remember if the '78s still had spoke wheels or not) loose spokes? If not, check the integrity of the ComCast rivets?

When I first got my 1200, it would bounce when starting out...pretty sure the cause was low/crappy fork fluid, as the seals were blown out and there was fork lube all over the pads/rotors, so it never got up to any speed before I fixed that.

(That tight front wheel is a major clue...methinks)

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post #4 of 23 (permalink) Old 11-10-2007, 09:44 PM
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For starters check the wheels for runout, specially the front. Use a screwdriver or some such held next to the fork and almost touching the wheel. The gap between the screwdriver tip and wheel should stay the same as the wheel turns. If you've checked the wheel bearings and know they are good, you can retrue the wheel by adjusting the spokes. You should also tap each spoke to listen for loose ones. They sound like 'tunk' instead of 'tink'. If any wheel doesn't turn freely it should be investigated to find out why.

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post #5 of 23 (permalink) Old 11-11-2007, 06:44 PM Thread Starter
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Ok guys, I'm back. Some addition info: It is happening on the front end only. Tomorrow I'm going to take the front wheel off and see what I can see.

~teacher~~~

~Butch~~~
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post #6 of 23 (permalink) Old 11-12-2007, 07:56 PM Thread Starter
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Well, today I took the front end off the bike because I thought maybe one or both the forks may be bent. After all this is the Bike I bought for $300 out of Waco that had been wrecked. I thought I check every thing and even bought a new frame, rear wheel, and triple tree. What I didn't check close enough was the right fork. Here are a couple of pictures when I bought it. See if you can spot the bend.........

~teacher~~~
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File Type: jpg Side-Wreck.jpg (63.3 KB, 152 views)

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post #7 of 23 (permalink) Old 11-12-2007, 07:58 PM Thread Starter
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Here is a view of the damage from the front:
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File Type: jpg Front-Wreck.jpg (69.9 KB, 149 views)

~Butch~~~
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post #8 of 23 (permalink) Old 11-12-2007, 08:41 PM
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Yep, I see it...I once had a 450 that was in an accident..I took the forks to a welder he heated them up with a torch a bit and we bent them back straight..never had any issues after I fixed them...and they were bent a lot more than yours..

Or a trip to the salvage yard...

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post #9 of 23 (permalink) Old 11-16-2007, 09:00 PM Thread Starter
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Ok here's where I am on this shaking thing.

I have: *replaced both forks with known good forks
*replaced the front tire, axle, and wheel
*checked the triple tree, bearings and fittings
*checked the rear axle bolt for tightness
*checked, both left and right, front brakes for drag
*checked air presure in both tires
*checked and replaced fairing bracket
*replaced the fork oil

Have I missed something and now what do I do?

Traveling through the different limits, 20mph-70mph it does fine. If I decelerate and 70mph I'm ok. But when it drops down to between 65 to 60, it is very hard to hold on to the bars. The shaking is not from side to side but more up and down.

Applying the front brakes during the shaking makes it worst, if that is possible.

Any thoughts?????

~teacher~~~

~Butch~~~
1983 GL1100A,Wineberry
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post #10 of 23 (permalink) Old 11-17-2007, 12:10 AM
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Try removing the fairing and see what it does.

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Past 'Wings: GL1100, GL1200, GL1500, GL1800

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