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Thread: 78 GS1000 suspension upgrades

  1. #11
    salty_monk's Avatar
    salty_monk is offline Forum LongTimer GSResource Superstar
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    Quote Originally Posted by White79bu View Post
    I'm just going off what a buddy did and he was very happy. The bike is a street bike but I would love to be able to do a few track days a year with it. So I am definitely open to suggestions. Where did you find your AP calipers?
    I'd have to say that the twinpot calipers would have at least as much power as the period AP's....

    1980 GS1000G - Sold
    1978 GS1000E - Finished!
    1980 GS550E - Fixed & given to a friend
    1983 GS750ES Special - Sold
    2009 KLR 650 - Sold - gone to TX!
    1982 GS1100G - Rebuilt and finished. - Sold

    www.agadisplay.com
    www.parasiticsanalytics.com

    TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

  2. #12
    Join Date
    Mar 2021
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    Lebanon, TN
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    Progressive suspension used to make rear shocks for those bikes. Not sure if they are still available or not. I bought a pair about a decade ago. Its a decent upgrade that keeps the original look.

  3. #13
    Join Date
    Dec 2012
    Location
    Stillwater, Mn.
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    I used a 1100E Front end with Race Tech internals, professionally done. 1100E swingarm, lighter, stronger and easy to find. Rebuilt my old Fox shocks. Salty Monk brakes. Bike is much better than when I raced it 30 years ago! The Race Tech front end on our lousy Mn roads is sweet. 1100 forks and 1000 forks are basically the same but 1000's look better w/o anti dive crap on them. Get 1100 caps if you want adjustable springs. Imo,as good as modern. Brake update with EBC HH pads and steel lines are phenomenal. You'll never find Fox Shocks but I will using Bi-Tubo rear shocks. Got them on a group buy on the ZRX forum, great price, rebuildable and the 40-50 guys who bought them, luv 'em. If your willing to spring for Dymags which you will never find, try spoked wheels. Be patient and find old 18" dirt bike rims and get 'em laced up. 18" front makes a huge differance and you will not hit the pipe of a 4/1. Very early 18" GSXR wheels are a fairly easy conversion and crazy light

    Dont cheap out on the brakes or suspension. Other wise its a expensive old bike that handles and brakes like an...old bike.
    Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
    Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
    Work in progress: 78 GS1000, unknown year GS1100ES

  4. #14
    Join Date
    Oct 2016
    Location
    NJ
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    I'm looking to upgrade suspension on my '79gs1K. On the highway at speed over rutts and bumps it is anything but on rails and a little scary. I can't get near the top end. I have sonic 1kg springs and racetech emulators up front. the springs are a little stiff for my 160lbs I should have gone .95 kg... So I cranked up the preload on stock rear shocks. a front end upgrade might be in the future but for now I'd like to get new shocks and swingarm. I believe the ZRX11 swingarm will fit and then I could use the stock ZRX KYB piggybacks but at 360mm they might be long. IDK what other shocks can be had for the ZRX swingarm but I bet YSS makes a good shock (for $700!). but then I'm wondering if the ZRX swingarm would command a wider tire and then force a front end swap (I have a 41mm front end from a '97 Katana and a CBR900 front end at 45mm with cartridges (but I think both of those are short for the GS Geometry and they both have 17" front wheels and I think I need an 18" min front wheel). This brings me back to the GS1100 swingarm (is there a steel one and an aluminum swinger?). Any recommendations for shocks with the GS1100 swingarm? and any comments on the ZRX swingarm and then shocks, front end, wheels? Is there a standard go too with swwingarm, shocks, frontend, wheels? I just missed a zephyr parts bike...
    1979 gs1000e (everyday) 1977 gs750 for sale
    1983 yam xj550 maxim streetbob sold
    1995 gsx750F everyday fighterjet 1990 gsx1100F for sale
    2000kaw zx600
    2003 BMW K1200GT sport tour
    2000Buel Cyclone M2 motorwork
    1984 Yam venture xvz1200 -long ride/cold ride ride gf ride..
    1978 Honda cb750F3 supersport top end (still)
    1976 Harley FL 3/8" S&S stroker - motor out way too long
    1980 Harley fxs80 - wacked good on this one

  5. #15
    Join Date
    Oct 2016
    Location
    NJ
    Posts
    195

    Default suspension upgrades

    Your bike has an awesome look is that an '83 GSX1100S? And both your front and rear wheels are aftermarket 18"?? what width rims and tire sizes? and wouldn't the ZRX 1100 swingarm do about the same with that Metmachex?? (did you have to lose your centerstand?). what kind of rear shocks and how is it on the highway??

    Quote Originally Posted by slayer61 View Post
    I hear you. I swapped out my 83 forks for some 89 forks. Went from "kid sister" skinny, no adjustment OEM forks, to fully adjustable 43mm RSU forks and kept my 18" wheels. Parts were easy, others more complicated.

    I wanted to keep my wheels as they were already aftermarket & kinda "period correct" for the bike without looking like everybody else's bike with modern (17" wheels & USD forks)"legs" on their vintage bike. It took new spacers and fab'ing brackets by hand, but it was worth every drop of sweat.

    The 1100e swingarm would also make a fine upgrade to your 1000. I am just in the process of putting one on my Mrs' GPz1100. The OEM swingarm worked great on my Suzuki, even with a 160 tire, but I wanted "just a little more" on mine. Metmachex was my answer. They are still in business, if you're interested.


    Enough of my blithering... the end results are below...



    1979 gs1000e (everyday) 1977 gs750 for sale
    1983 yam xj550 maxim streetbob sold
    1995 gsx750F everyday fighterjet 1990 gsx1100F for sale
    2000kaw zx600
    2003 BMW K1200GT sport tour
    2000Buel Cyclone M2 motorwork
    1984 Yam venture xvz1200 -long ride/cold ride ride gf ride..
    1978 Honda cb750F3 supersport top end (still)
    1976 Harley FL 3/8" S&S stroker - motor out way too long
    1980 Harley fxs80 - wacked good on this one

  6. #16
    Join Date
    Jun 2018
    Location
    Stuck in Lodi, again
    Posts
    115

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    Quote Originally Posted by garyS-NJ View Post
    Your bike has an awesome look is that an '83 GSX1100S? And both your front and rear wheels are aftermarket 18"?? what width rims and tire sizes? and wouldn't the ZRX 1100 swingarm do about the same with that Metmachex?? (did you have to lose your centerstand?). what kind of rear shocks and how is it on the highway??
    Thanks Gary. Suzuki made a 1 year model, the 1983 GS1100es in this country. The wheels are Astralites, and both front & rear are indeed 18" hoops. I bought them so long ago, I couldn't tell you how wide they are. I did recently buy tires, though... 110/80-18 on the front & 160/60-18 on the rear. I can't compare a ZRX swingarm to the Metmachex. I never had a ZRX swingarm on my Zook. I enjoy having things that you don't see every day, and the Metmachex fills that very nicely. Between the swingarm & pipe, I have no center stand, but I do have a couple of work stands in the garage.

    Be safe & good luck with your project.

  7. #17
    Join Date
    Jul 2011
    Location
    Oklahoma
    Posts
    2,807

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    Quote Originally Posted by garyS-NJ View Post
    I'm looking to upgrade suspension on my '79gs1K. On the highway at speed over rutts and bumps it is anything but on rails and a little scary. I can't get near the top end. I have sonic 1kg springs and racetech emulators up front. the springs are a little stiff for my 160lbs I should have gone .95 kg... So I cranked up the preload on stock rear shocks. a front end upgrade might be in the future but for now I'd like to get new shocks and swingarm. I believe the ZRX11 swingarm will fit and then I could use the stock ZRX KYB piggybacks but at 360mm they might be long. IDK what other shocks can be had for the ZRX swingarm but I bet YSS makes a good shock (for $700!). but then I'm wondering if the ZRX swingarm would command a wider tire and then force a front end swap (I have a 41mm front end from a '97 Katana and a CBR900 front end at 45mm with cartridges (but I think both of those are short for the GS Geometry and they both have 17" front wheels and I think I need an 18" min front wheel). This brings me back to the GS1100 swingarm (is there a steel one and an aluminum swinger?). Any recommendations for shocks with the GS1100 swingarm? and any comments on the ZRX swingarm and then shocks, front end, wheels? Is there a standard go too with swwingarm, shocks, frontend, wheels? I just missed a zephyr parts bike...
    Just buy a good set of shocks and forget all that other stuff.
    Rich Desmond
    1980 GS1000S
    2007 V-Strom 650
    2008 Ducati 848
    2002 DR-Z400S
    1999 SV650 (race bike)

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