progressive springs and air


Information and questions on GL1100 Goldwings (1980-1983)
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quasi2008
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progressive springs and air

Post by quasi2008 »



I've read in several threads that air is not a requirement when running progressive springs in the forks. I've just rebuilt my shocks with the progressive springs and seals. with the new progressive springs in the shocks is air recommended. I did notice that the new springs were about 1/2" shorter than the OEM's. what say ye?


man can't live on air alone!
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Johnyy Smoke
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Re: progressive springs and air

Post by Johnyy Smoke »

You shouldn't need to add air with the progressive springs.
But if ya wanna play around with it, why not? I kept my air fittings on the front just to have them, but have never used it. Regards, Johnny
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quasi2008
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Location: morgantown wv
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Re: progressive springs and air

Post by quasi2008 »

yeah, i'm not running air in the forks. was just wondering about the rear shocks. i'll do some experimenting with it and see how it goes. tks
man can't live on air alone!
bhurt
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Location: Prince Albert, Saskatchewan, Canada
Motorcycle: 1982 GL1100 Interstate

Re: progressive springs and air

Post by bhurt »

do you happen to recall how long the progressive springs were? I am trying to figure out if I have progressive springs in my forks. I believe they are as the air valve has been sealed up and the rear has progressive springs on it with the air deleted. Also what type of oil did you put in your forks? I just pulled the spring out to have a look but didn't drain or refill any oil, however it stunk like cow manure when I pulled that spring out.
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DenverWinger
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Re: progressive springs and air

Post by DenverWinger »

If I'm not mistaken Progressive fork springs were just that - half the length had the coils wound tighter than the other half, easy to spot.
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dakotanator
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Re: progressive springs and air

Post by dakotanator »

quasi2008 wrote: Sun Apr 28, 2019 8:25 am I've read in several threads that air is not a requirement when running progressive springs in the forks. I've just rebuilt my shocks with the progressive springs and seals. with the new progressive springs in the shocks is air recommended. I did notice that the new springs were about 1/2" shorter than the OEM's. what say ye?
Rebuilt my '83 Aspy last year and put Progressives on front and back. NO AIR REQUIRED. The ride is absolutely fantastic. Far better than the stock ones, in my opinion. Just took her out yesterday after her winters nap, and it's like riding a lounge chair with 2 wheels. Progressives are a great upgrade.
It's not WHAT you ride......it's THAT you ride.
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Johnyy Smoke
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Re: progressive springs and air

Post by Johnyy Smoke »

What type of oil you use depends on what you want for a comfortable drive. Some recommend ATF 20w or even 10w. Progressive recommends 30w. I run 30 and it works for me. Trial and error. Regards, Johnny
t2oldbikes2
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Location: St. Clair Shores, Mi.
Motorcycle: 1982 Goldwing GL1100I Interstate

Re: progressive springs and air

Post by t2oldbikes2 »

Those look a lot like 412 Progressive shocks, which are going on my GL1100i tonight. Had 416-1322 Air shocks but PO jacked up the rear left by not installing the bushing on the swingarm mount. The movement popped the top.
When it comes to the forks, Progressive used to specify cutting a spacer out of tubing to take up the free length gap or to preload the springs, two separate cases. You can contact them for installation info and they are generally helpful to an extent. Spacers can be made from aluminum, steel or plastic tubing. I've used the fork springs in BMWs and liked them although they were tight fits w/no spacer. They work well after a short break-in.
As far as air in the forks: Give it a try. Start at about 5lbs and compare it. Move up in 5lb increments until you dislike it. It really depends on what you like. I had a KLR running 7lbs and it made a nice little difference.


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