Rear Shocks and front forks


Information and questions on GL1100 Goldwings (1980-1983)
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Honkytonk379
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Rear Shocks and front forks

Post by Honkytonk379 »



Anyone out there know what bikes might interchange with my 81 gl1100 as far as rear progressive shocks and complete front end ( forks and trees ) ? I am building a Rodwing and it would be nice to know a few short cuts since this is the first Goldwing that I am attempting to chop


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jeffcosmo
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Re: Rear Shocks and front forks

Post by jeffcosmo »

What is your level of fabrication skills??

Very little in the motorcycle world directly interchanges, esp. in the world of Japanese motorcycles.

Having said that, I do think that CBX Pro-Link forks are a close match.

Good luck with that...($$$$$$)

BTW, I have changed forks, brakes, ignitions, suspensions, etc. My fabrication skills are above average, I weld (all processes) and I know good machinists.

Cosmo
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Hoosier Jack
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Re: Rear Shocks and front forks

Post by Hoosier Jack »

You're probably getting crickets here because I doubt that very few people think about replacing the front end of the Gold wings. They are pretty stout and can be adjusted quite a bit with progressive springs, different weight oil and air adjustments. That being said we have to consider what these bikes are being used for. They are not track bikes, or for that matter a sportbike. It is actually amazing that they can be flung around as well as they can be.

I believe that the shock length in the rear is 12.5 inches and you can see what you can find for a replacement. Raise the rear, or lower as you like. There is a clearance issue with going too low. Especially if you have bags.

Welcome to to forum. Maybe some will chime in and prove me a fool. That happens.
dads82
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Re: Rear Shocks and front forks

Post by dads82 »

Heya Jeffcosmo - I'm new to the crew as well - Recently started stripping my dad's 82gl1100A (i rode it for a while when dressed now and ready for something different) on the topic of Progressive 412 rear shocks...I am keeping the stock front forks but replacing the rears with Progressives. About to purchase 412's 12.5" (pricey but worth it I hear) when i enter the make/model info into the Progressive chart it says the shock won't fit the bike. Is this based on the bike being fully dressed and shock hits on saddle bags? There's plenty of room when its stripped so I am thinking that is the case. Any help on that subject before I purchase would be most appreciated!
Happy New Year lets ride!
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WingNutJC
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Re: Rear Shocks and front forks

Post by WingNutJC »

dads82 wrote: Thu Jan 11, 2018 9:40 pm Heya Jeffcosmo - I'm new to the crew as well - Recently started stripping my dad's 82gl1100A (i rode it for a while when dressed now and ready for something different) on the topic of Progressive 412 rear shocks...I am keeping the stock front forks but replacing the rears with Progressives. About to purchase 412's 12.5" (pricey but worth it I hear) when i enter the make/model info into the Progressive chart it says the shock won't fit the bike. Is this based on the bike being fully dressed and shock hits on saddle bags? There's plenty of room when its stripped so I am thinking that is the case. Any help on that subject before I purchase would be most appreciated!
Happy New Year lets ride!
Rear shocks: I bought Progressive 14.5" 416's for what I now believe were for a GL1200.

I wanted more cornering clearance as I was sick of scraping everything in the twisties.

As they for the 1200 (100lb heavier than my 1100 as it now stands), it means the rear is oversprung and underdamped. Uncomfortable.

But LOTS of cornering clearance. :mrgreen: :mrgreen: :mrgreen:

Progressive have been no help at all with spring rate info, so I'll have to dismantle and measure the rate myself.

I posted re my experience with Progressive:
viewtopic.php?f=16&t=30957#p179737

Don't be discouraged tho, cause WOW - these bikes can handle. Ask my sport bike friends. :twisted:
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WingNutJC
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Re: Rear Shocks and front forks

Post by WingNutJC »

dads82 wrote: Thu Jan 11, 2018 9:40 pm Heya Jeffcosmo - I'm new to the crew as well - Recently started stripping my dad's 82gl1100A (i rode it for a while when dressed now and ready for something different) on the topic of Progressive 412 rear shocks...I am keeping the stock front forks but replacing the rears with Progressives. About to purchase 412's 12.5" (pricey but worth it I hear) when i enter the make/model info into the Progressive chart it says the shock won't fit the bike. Is this based on the bike being fully dressed and shock hits on saddle bags? There's plenty of room when its stripped so I am thinking that is the case. Any help on that subject before I purchase would be most appreciated!
Happy New Year lets ride!
Rear shocks: I bought Progressive 14.5" 416's for what I now believe were for a GL1200.

I wanted more cornering clearance as I was sick of scraping everything in the twisties.

As they for the 1200 (100lb heavier than my 1100 as it now stands), it means the rear is oversprung and underdamped. Uncomfortable.

But LOTS of cornering clearance. :mrgreen: :mrgreen: :mrgreen:

Was very frustrated with poor technical assistance re getting softer springs, but since my last experience with Progressive, this has appeared on their website.
All spring info - front and rear: :D

https://www.progressivesuspension.com/a ... h-Info.pdf

Here's the background re my bike, plus my then experience with Progressive.
Howvever, they seem to have improved since then.

viewtopic.php?f=16&t=30957#p179737

Don't be discouraged tho, cause WOW - these bikes can handle. Ask my sport bike friends. :twisted:

BTW: Have you seen these:
http://www.ebay.com.au/itm/Progressive- ... SwOMdZUViF
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Overdog
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Re: Rear Shocks and front forks

Post by Overdog »

I remember seeing somewhere that a Magna front end can be fitted to an oldwing
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jeffcosmo
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Re: Rear Shocks and front forks

Post by jeffcosmo »

I have two running '83 Aspys. one stock, and one modified a bit. The main bike has Progressive suspension front and rear and easily out-handles and out-rides the stocker. Ride height is increased with Progressive rear (air) shocks.

As to the handling: yes, these are more capable than you would, at first, believe. However, beware pushing this bike into a sweeping high-speed corner, IT WILL WEAVE!!! The frame is still an early-eighties Japanese frame, complete with hinge in the middle.

Cosmo
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WingNutJC
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Re: Rear Shocks and front forks

Post by WingNutJC »

jeffcosmo wrote: Fri Jan 12, 2018 5:56 am I have two running '83 Aspys. one stock, and one modified a bit. The main bike has Progressive suspension front and rear and easily out-handles and out-rides the stocker. Ride height is increased with Progressive rear (air) shocks.

As to the handling: yes, these are more capable than you would, at first, believe. However, beware pushing this bike into a sweeping high-speed corner, IT WILL WEAVE!!! The frame is still an early-eighties Japanese frame, complete with hinge in the middle.

Cosmo
No. Not the frame.

Worn tires and weak fork damping.
Don't forget swing arm pivot play, and wheel bearing play.
(These need attention on my GL. I'm expecting more improvement when done).

This undulating corner at 60mph - almost a tank-slapper. Frightening.
New Avon Cobra's: barely a whimper at 70mph
15W fork oil (Have firmer springs): happy at 70mph.



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jeffcosmo
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Re: Rear Shocks and front forks

Post by jeffcosmo »

Try merging onto I-90 from northbound 53 at 90 mph. The hinge is real, though better than the '87 FLHS I owned a while back. And scads better than the 650 Tempter, which I got rid of VERY shortly after it wobbled 'round a mild corner at slow(ish) speeds.

IMHO, there was no Japanese bike able to go 'round corners as well as most British bikes until the Honda 750F of about 1980.

And quite a while longer before they got the equal (maybe) of the Italians.

My experience includes ownership of: 250 Sprint Aermacchi (H-D), 160 Monza Jr., 250 Monza, 860GT Duke. 850T Guzzi. 750GT American Eagle (props to anyone who knows who manufactured; double props to whoever knows the personality behind same), 500 Daytona Triumph, 650 Bonneville (OIF), 900 Trophy, 955i Tiger.

My Japanese ownership is quite a bit less, 'cause I LIKE going 'round corners...

Cosmo
dads82
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Re: Rear Shocks and front forks

Post by dads82 »

Thank you for the replies. Much appreciated. Kinda bummed to hear about the Progressive 412's coming undone - I will read some more on race tech but I'm still leaning towards the Progs.
I dont want to raise the rear of the gl1100 it sits right where i want it at 12.5 that much i have decided. I'm still stripping and I have a long way to go before i start putting new parts on - just thinking ahead.

a guy could learn a lot here - me
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WingNutJC
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Re: Rear Shocks and front forks

Post by WingNutJC »

dads82 wrote: Fri Jan 12, 2018 9:32 pm Thank you for the replies. ... ... ...
I dont want to raise the rear of the gl1100 it sits right where i want it at 12.5 that much i have decided. I'm still stripping and I have a long way to go before i start putting new parts on - just thinking ahead.

a guy could learn a lot here - me
But why do you you want it at 12.5" ?
Allows greater cornering angles = more cornering speed. Muaaahh harr harrr ...

13.5 is stock. I'm always surprised to read of so many riders wanting to lower the ride height of their Wings.
As I'm 6'4", it's the other way for me, but only to gain cornering clearance.

:twisted:
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WingNutJC
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Re: Rear Shocks and front forks

Post by WingNutJC »

jeffcosmo wrote: Fri Jan 12, 2018 2:49 pm Try merging onto I-90 from northbound 53 at 90 mph. The hinge is real,

Cosmo
Hey Cosmo - but first, have you attended to all those running gear issues I mentioned?

Fork and shock damping is particularly important. Among other things, it will damp the front/rear rocking horse motion that leads to speed wobble.

This "to and fro" motion causes a change in steering head angle, speeding up or slowing steering response. When heeled over in a corner, you can't forget the rising/falling effect of the rear end, in both the vertical and horizontal, that reflects as a changing steering head angle, leading to a speed wobble.

But before all else - eliminate all sources of frame/wheel wobblies. :-)
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jeffcosmo
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Re: Rear Shocks and front forks

Post by jeffcosmo »

WingNutJC wrote: Sat Jan 13, 2018 5:41 am
Hey Cosmo - but first, have you attended to all those running gear issues I mentioned?
Glad you are so informed as to how poorly I maintain my motorcycles. Hadn't realised that that information had made it past even the Mason-Dixon line.

Note that going from a modern Triumph (or any Ducati) to a vintage Japanese bike (as I did) will tend to point up the deficiencies in said Japanese frame. Try as you might to negate the basics, there HAVE been a couple improvements in frame design since 1975.

Now off to the shed and knock a couple pounds of rust off of me Aspencade...
Cosmo
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dummysales
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Re: Rear Shocks and front forks

Post by dummysales »

Okay, wizards, here's my dilemma. 83 Aspencade front fork parts.

The Aspencade 83 parts manual available on Goldwingdocs shows two springs, A and B. B is the longer main spring; A is shorter and with a washer separating it from B.

Why do I have one spring that is nominally 19-7/8" long and is it long enough to reinstall?

The original down tubes are worn and I've ordered new tubes (Franks), and have new seals, bushings, and sliders. There is a part called a piece, oil lock on the parts list, but there is nothing like that with the parts I took off. Has someone else (don't know entire bike history) left something off, or does the longer spring negate the need for the piece?

And, GO!
waj
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bruce swaybill
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Re: Rear Shocks and front forks

Post by bruce swaybill »

One single spring is an aftermarket spring, possibly a Progressive Suspension model since they were very popular over the years.
(Does it have two different coil spacings?)

The spring will stick out the top of the upper fork tube when extended and will need to be compressed to thread the fork cap on.
(This provides some of the preload to hold the front end up.)
Good luck with that. It’s a right of passage…

I used the stock spec 10w oil last time but next time I’ll try 15w.

Bruce S.
Have a nice day! :)
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dummysales
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Re: Rear Shocks and front forks

Post by dummysales »

Thank you, Bruce S.

I presumed the aftermarket status, and yes, there are two coil spacings. No telling when they installed that spring set up. Any way to tell how long they should be? These measure nominally 19-7/8".

Also, the parts manual shows a Piece, oil lock, item 51432-438-671 at the base of the lower tube configuration. There wasn't one in either of these tubes. Were those specific to the two-spring set up? Do I need them?

waj
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Re: Rear Shocks and front forks

Post by joecoolsuncle »

shorter spring is a stiffer spring. think damping at the bottom of the stroke. race tech springs have better damping rates for more aggresive riders. if staying with stock marshmellow ride, stay with stock springs and refresh with new oem. the rest gets into welding and redrilling damper rods, oil viscosity, oil level, sprung and unsprung weight, temperatures, track surface, etc. dont go there unless you are a glutton for punishment and have access to a controlled environment in which to test.
peace
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dummysales
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Re: Rear Shocks and front forks

Post by dummysales »

Thanks for the reply on the spring set up, JCU.

What about the Piece, oil lock item?

Waj
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dummysales
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Re: Rear Shocks and front forks

Post by dummysales »

Anyone have a pic of that piece?


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