?Shock Adjustment? - Rear Bottoming Out


Information and questions on GL1000 Goldwings (1975-1979)
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swr1977
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Motorcycle: 1978 Goldwing GL1000

?Shock Adjustment? - Rear Bottoming Out

Postby swr1977 » Fri Jul 18, 2014 10:20 am



Hello Goldwingers... I have a 1978 - GL1000

How much air-pressure should I have in my shocks? Is there a way to adjust them other then inflating/deflating the amount of air-pressure in them?

Over the past 5-10 rides I've notice that I bottom out more and more. (Only in the back / Front seems fine) It first happened about 2 months ago the first time a road with a passenger, So I thought that maybe they just needed adjusting (more air pressure?) then after adding air to the back I've notice it will bottom out with only me riding and I don't have but just a very few things (weight) in the bags and trunk.

There is no gauge on the back like there is mount on the front forks and a family member told me to check how much was in front and put the same +/- 5lbs in the back. Is that correct? What is the right amount to have front verses back? Can that changed depending on what brand/type of shocks I have? and was air-shocks standard on the 78-GL1000 ? or was this a mod the a PO made to the bike?
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Re: ?Shock Adjustment? - Rear Bottoming Out

Postby WingAdmin » Fri Jul 18, 2014 11:50 am

The bike does seem to look like it's sitting a little low in back.

It's possible that the springs are just tired out. You can keep increasing air pressure to try to compensate, but at some point it's going to exceed the capability of the shock and will just blow out the seals when you hit a big bump.

Replacing the springs or the entire shocks is the normal solution. I know when I replaced my rear shocks on my GL1100, the back end of the bike sat up a good inch and a half from where it was sitting with the old, tired shocks. It transformed how the bike handled, as lifting the back end will change the geometry of the front forks/wheel, giving you less trail and subsequently faster steering.

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swr1977
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Location: Granite Falls, Washington, USA
Motorcycle: 1978 Goldwing GL1000

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby swr1977 » Fri Jul 18, 2014 12:47 pm

What am I looking at price $$$ wise ? and what springs do you recommend ?
For Some there's THERAPY, for the Rest of Us There are MOTORCYCLES

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WingAdmin
Site Admin
Posts: 17047
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby WingAdmin » Fri Jul 18, 2014 1:34 pm

swr1977 wrote:What am I looking at price $$$ wise ? and what springs do you recommend ?


I can't really make a recommendation for the GL1000, not having had the opportunity to replace a set on one. I can tell you that I was impressed enough with the Progressive 416's I put on my GL1100 that I put a set on my GL1500 as well.

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swr1977
Posts: 103
Joined: Sun Sep 29, 2013 9:18 am
Location: Granite Falls, Washington, USA
Motorcycle: 1978 Goldwing GL1000

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby swr1977 » Fri Jul 18, 2014 5:01 pm

WingAdmin wrote:I can't really make a recommendation for the GL1000, not having had the opportunity to replace a set on one. I can tell you that I was impressed enough with the Progressive 416's I put on my GL1100 that I put a set on my GL1500 as well.


Thanks! Where did you purchase the "Progressive 416's" ? and how much did they cost you? Did you install them yourself?

Do you have any idea what the correct air pressure is? I can't find anything about air-shocks in the manual!

Also ... were air-shocks standard on the 78-GL1000 ? or was this a mod the a PO made to the bike?
For Some there's THERAPY, for the Rest of Us There are MOTORCYCLES

User avatar
swr1977
Posts: 103
Joined: Sun Sep 29, 2013 9:18 am
Location: Granite Falls, Washington, USA
Motorcycle: 1978 Goldwing GL1000

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby swr1977 » Fri Jul 18, 2014 8:16 pm

I these pics are the right rear shock. I think it says SW Mark II or III
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For Some there's THERAPY, for the Rest of Us There are MOTORCYCLES

User avatar
WingAdmin
Site Admin
Posts: 17047
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby WingAdmin » Sat Jul 19, 2014 9:07 am

swr1977 wrote:
WingAdmin wrote:I can't really make a recommendation for the GL1000, not having had the opportunity to replace a set on one. I can tell you that I was impressed enough with the Progressive 416's I put on my GL1100 that I put a set on my GL1500 as well.


Thanks! Where did you purchase the "Progressive 416's" ? and how much did they cost you? Did you install them yourself?



They were around $320 for the pair, came from http://cyclemax.com and I sure did put them in myself - you can see the pictures here: How to remove and replace your rear shocks

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swr1977
Posts: 103
Joined: Sun Sep 29, 2013 9:18 am
Location: Granite Falls, Washington, USA
Motorcycle: 1978 Goldwing GL1000

Re: ?Shock Adjustment? - Rear Bottoming Out

Postby swr1977 » Sat Jul 19, 2014 9:24 am

WingAdmin wrote:They were around $320 for the pair, came from http://cyclemax.com and I sure did put them in myself - you can see the pictures here: How to remove and replace your rear shocks



Thanks for the info and links!


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