changed shocks and now i bottom out


Information and questions on GL1100 Goldwings (1980-1983)
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halcombrick
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Motorcycle: 1982 GL1100 Interstate

changed shocks and now i bottom out

Postby halcombrick » Tue Jun 23, 2015 2:48 pm



hey guys, i had a bad set of progressive shocks on my 82 interstate. i took them off and one was leaking from the very top and the other had a broke sring in it and it sounded like a spray can of paint it rattled so bad. so i got me a good set of oem shocks and put on. now even with 60lbs of air in the shocks i am still bottoming out. i am a big guy 6'4 300 lbs but should i be bottoming out? with max air what should the distance from the ground to my rear bumper be? thanks guys,, i am frustrated annoyed and just plain stumped.


Rick, 82 GL1100 Interstate

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tom84std
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Re: changed shocks and now i bottom out

Postby tom84std » Tue Jun 23, 2015 3:15 pm

I'm sure you're frustrated and I don't blame you. You probably already have checked it, but someone's sure to ask so I guess I'll be the one. Have your new shocks got a preload adjustment?

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halcombrick
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Re: changed shocks and now i bottom out

Postby halcombrick » Tue Jun 23, 2015 8:37 pm

No...no preload, they are a set of oem...they are are almost nos, that's what I cant figure out.
Rick, 82 GL1100 Interstate

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tom84std
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Re: changed shocks and now i bottom out

Postby tom84std » Wed Jun 24, 2015 7:46 am

Yes I was afraid you were going to say that but had to ask. You're limited in options. My wife and I rode a 79 a lotta miles on a pair of Progressives. Our combined weight was well over 300 and we had loaded bags and trunk, heavy trailer tongue to add to that. Those shocks really held up well. Those shocks were purchased around 2002 and I can't remember the model number, but they weren't expensive enough for me to remember the price. You've had a bad pair of Progressives but I've had very good experience with them. As far as I know everything I've ever heard about them leads me to believe they're still considered the premium shock for our usage. They have customer service and a number you can call. Maybe you can discuss it with one of their people.

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WingAdmin
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Re: changed shocks and now i bottom out

Postby WingAdmin » Wed Jun 24, 2015 10:55 am

With 300 lbs, you should not be bottoming out the OEM shocks, especially with 60 psi of air pressure in them. Just to check, you aren't carrying a couple hundred pounds of stuff in your trunk/bags, are you?

The only thing left then is the springs on the OEM shocks - they must be tired and no longer able to support the weight.

Dogsled
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Re: changed shocks and now i bottom out

Postby Dogsled » Thu Jun 25, 2015 5:44 pm

Did you ever say what type shock system you bought?
"Fight until hell freezes over, then fight on the ice"

sportsfreaked
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Re: changed shocks and now i bottom out

Postby sportsfreaked » Thu Jun 25, 2015 8:26 pm

My question is how do you know the OEM shocks are good? Were they used OEM shocks or brand new ones? Your post wasn't very clear in regards to that. If they are used OEM then I would suspect that they are not good OEM shocks and need to be rebuilt. Rebuilding them would be cheaper then buying new ones and then you would know for sure that you have a good pair of shocks!
Thanks to all who answer and help. It is greatly appreciated!
Ed

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Johnyy Smoke
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Re: changed shocks and now i bottom out

Postby Johnyy Smoke » Sun Jun 28, 2015 3:13 pm

It does sound like a rebuild is in order. Be sure to replace the springs as well. Regards, Johnny

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halcombrick
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Re: changed shocks and now i bottom out

Postby halcombrick » Sun Jun 28, 2015 10:55 pm

Springs? I'm confused. I thought the shocks were completely hydraulic and didn't have internal springs. The shocks I took off were progressive. I know they have a lifetime warranty..has anybody got them to replace an old set?
Rick, 82 GL1100 Interstate

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WingAdmin
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Re: changed shocks and now i bottom out

Postby WingAdmin » Mon Jun 29, 2015 8:55 am

halcombrick wrote:Springs? I'm confused. I thought the shocks were completely hydraulic and didn't have internal springs. The shocks I took off were progressive. I know they have a lifetime warranty..has anybody got them to replace an old set?


There are definitely springs inside, that's what supports the weight of the bike. The hydraulic portion of the shock is just for damping, to keep the springs from resonating and bouncing, and to keep the tire on the pavement as much as possible.

Some shocks have a preload setting, which allow you to rotate the spring base on a threaded portion of the shock, which compresses the spring more or less as you rotate it. This allows you to set the shock up to handle more or less weight - i.e. you would increase the preload if you were carrying a heavy load.

Air (pneumatic) shocks do the same thing, except you increase the air pressure to increase the preload - it adds support for heavier loads. But it doesn't take the place of the spring. To have a shock that had air only and no spring you'd need a huge amount of air pressure, several hundred psi, in order to do that - which would make the shock very heavy (in order to handle the pressure) as well as the seals extremely large and expensive.

The GL1500 has two different rear shocks on the rear - one has a spring, the other has only air (no spring). The shock with the spring supports the bike's weight, the side with air modifies preload.

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halcombrick
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Re: changed shocks and now i bottom out

Postby halcombrick » Mon Jun 29, 2015 1:51 pm

Oh ok thanks...I'm thinking too I may be really low on fluid. I didn't know before I put them on but my wife knocked them over and had to add clean up fluid that leaked out and thinking Ba k I remember hearing the fluid sloshing in the shock...good sign its pretty low lol
Rick, 82 GL1100 Interstate

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halcombrick
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Re: changed shocks and now i bottom out

Postby halcombrick » Mon Jun 29, 2015 5:15 pm

Found my problem...only 3 ounces of fluid in each shock. Refilled and about to test ride now.


Rick, 82 GL1100 Interstate


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