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    Gs450 Race Bike

    Hello, I am building an 81 gs450 to race AHRMA Vintage Superbike Light Weight. I have built other vintage race bikes but not a GS. At this point I am thinking of doing just the min. to get it on the track. Low milage motor(10,000) Check valves check for leaks head gasket etc. I have a Dyna S ignition I think can be modified to fit, 34mm Mikuni's and race exhaust.18in front wheel from a GS450s, better rear shocks, rearsets from a cbr929 which are amazingly almost bolt-on once the old brackets are removed. Stripped down frame, rotor, stator and starter removed. This build is pretty low budget, but I know the forks will need work or upgrading at some point(41mm max.)and maybe the swingarm. Any and all info concerning weak points, reliability issues, frame bracing etc. would be GREATLY appreciated Thanks!
    Last edited by Guest; 01-06-2017, 02:41 PM.

    #2
    If you want the Dyna ignition on there, get the kit for the GS400 twins, but tell the guys at Dynatek you're putting it on a 450 and need the rotor spacer they provide with the kit for the larger inline 4's. Then it really will be a bolt on.

    Can you shoot photos of the how the rearsets go on? And what year 929? In the back of my mind is thoughts of redoing my 450 once I get my Katana on the road and I'm still contemplating the idea of rear sets for it.

    Sounds like a bit of fun to me!
    1982 GS450E - The Wee Beastie
    1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

    sigpic

    450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

    Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

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      #3
      If you're as cheap as me, you can make any Dyna fit with some work.

      In my experience racing 450's they don't need frame bracing. Decent shocks, yes, fork work, yes. Just get your weight lower and up forward.
      When you check the valves, I'd recommend going to around .004in inlet and .005in exhaust clearance. A bit more than stock doesn't hurt - and it will get hotter racing.

      Comment


        #4
        Very helpful info Thanks guys! I will post some pics as the build progresses. Not 100% positive till I double check, but the rearsets are 00-01 cbr929. I will post a pic once I have them mounted. Again Thanks!

        Comment


          #5
          I'd at least though some good fork springs and oil in the forks, it will make a big difference.
          We don't have any that will fit, but Race-Tech makes a 22mm OD spring that should work.
          '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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            #6
            gadoots.jpg Getting stripped down for race prep. replaced swingarm needle bearings greased and adjusted steering head. Looking for a used pair of 34mm Mikuni round slides. Vintage Superbike are production classes that requires you use tank, side covers, fenders(can be trimmed or replicas), Seat pan(can modify and recover), headlight shell, instrument pods(speedo can be replaced with just a shell) from the original production bike. No handle bars lower then the top fork crown. No fairings unless original equipment. Year cutoff is 82' or "like design"
            Last edited by Guest; 01-13-2017, 11:38 PM.

            Comment


              #7
              craigs suzuki.jpgHere is an example of one my friend just happens to be selling. I think this bike is still streetable where mine won't be.
              Last edited by Guest; 01-13-2017, 10:40 PM.

              Comment


                #8
                Your friend's bike is cool! Good luck with your build, and welcome to site.
                Where will you be racing?
                sigpic
                When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

                Glen
                -85 1150 es - Plus size supermodel.
                -Rusty old scooter.
                Other things I like to photograph.....instagram.com/gs_junkie
                https://www.instagram.com/glen_brenner/
                https://www.flickr.com/photos/152267...7713345317771/

                Comment


                  #9
                  Originally posted by herm744 View Post
                  [ATTACH=CONFIG]49314[/ATTACH]
                  I think this bike is still streetable ...
                  Yeah, you might still be able to ride it on the street, but you are limited to how far you can go by just one tankful of gas, because you can not stop the bike and get off anywhere except where you left your paddock stand.

                  .
                  sigpic
                  mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                  hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                  #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                  #2 son: 1980 GS1000G
                  Family Portrait
                  Siblings and Spouses
                  Mom's first ride
                  Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                  (Click on my username in the upper-left corner for e-mail info.)

                  Comment


                    #10
                    Haha good point, yes you would have to put the side stand back on, tail light and headlight, and maybe the charging system and starter if it was removed.

                    Comment


                      #11
                      Nice and clean!
                      I would want lower handlebars, those are rather high and pulled back. I would only use those if I were riding la-di-da around town.
                      According to the rule, straight drag bars are legal and they would get your shoulders, arms down a few more inches and forward.
                      Best of luck!
                      "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
                      1982 GS1100G- road bike, body, seat and suspension modded
                      1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
                      1987 Honda CBR600F Hurricane; hooligan bike, restored

                      Comment


                        #12
                        Stripped down, frame still needs some tabs cut off I have a box of parts now of what was removed, must weigh 50 or 60 lbs. I should be able to save another 10lbs. with the exhaust changed. Plan is to cut 1.5" off the fork springs and make a spacer out of 1" pvc pipe to stiffen the forks and run some 15wt. fork oil. These forks take 150cc. I have changed the front rim to an 18in. They steer to slow with the 19. Swapping out the rear rim for an aluminum 3.00x17. Stock rear sprocket replaced with an aluminum one. I will need a toe guard for that buzz saw yikes. Cut the rear fender. Lightening the rear brake plate next. Redwing shocks for now, I have a pair of mulhollands that I am rebuilding I put them on everything pretty much, but you can run piggyback shocks in the class. Rearsets fit good, but still have to check clearance for the exhaust. The seat will be cutdown 1" still trying to figure the best way to do it. I have a ratty seat to try on. Stock ignition is shot still have to adapt the Dyna S. Found some cheap 34mm snowmobile carbs to try. and Got the drag bars .It will run total loss ignition, and the starter flywheel rotor and starter clutch and gears will be removed soon as I know it will start! Finally I need help getting the nerve to cut up a perfectly good front fender!suzuki2.jpg
                        Last edited by Guest; 02-06-2017, 07:23 PM.

                        Comment


                          #13
                          race bike

                          suzuki1.jpgand the back

                          Comment


                            #14
                            Originally posted by herm744 View Post
                            ...Plan is to cut 1.5" off the fork springs and make a spacer out of 1" pvc pipe to stiffen the forks and run some 15wt. fork oil. These forks take 150cc...
                            That will help a little, but the stock springs are so soft that cutting them down won't help much. If there's enough room in the budget a good set of springs (Race-Tech has the size you need) will help a tremendous amount.
                            If you stick with the cut down stock springs you'll need 1/2" schedule 40 PVC. Rather than use the stock volume, set the level to 100mm (stock springs) or 120mm (aftermarket). "Level" is actually the air gap, it's measured from the top of the tube down to the surface of the oil, with the spring and spacer removed and the fork leg fully compressed. Bigger number means less oil.
                            Ping me if you have any questions.
                            '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

                            Comment


                              #15
                              The only reason I did not want to spend much on these forks is because the class allows up to 41mm tubes. The plan is at some point to upgrade the whole front end with later model forks. However, when I pulled those stock springs out I didn't know they where so long and so many coils. There is no way to stiffen them enough without them binding up. I was wondering if there is a gold valve upgrade for these forks. Will check that out .Thanks for the info!

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