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Where’s the GSR40 guys at??!?

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  • Where’s the GSR40 guys at??!?

    So I picked up a decent looking gsr40 the other day. There’s a problem with the clutch right now, so that’ll be the first thing I take apart and look at. It’s got a custom looking pipe on it, and a basic non-adjustable carb.. SO, is there any MUST DO mods for this scooter/engine?? Maybe a flywheel key? Should I do a different carb? I think I wanna take the pipe off and put a stock muffler on it honestly. Plans are to get it to do 40 without looking/sounding like I’m trying to haul ***. I’ll try and post pics
    Attached Files

  • #2
    Yea take that ugly pipe off and put on a can. Adjustable carb (1107) and gearing is what you want. What gearing on it now?

    Comment


    • #3
      Get it ported as well (not that much money)

      Comment


      • #4
        Originally posted by Hubsondubs View Post
        Yea take that ugly pipe off and put on a can. Adjustable carb (1107) and gearing is what you want. What gearing on it now?

        Gearing right now is 6/something. The guy said it was factory gearing.. And porting sounds nice, but A) Idw to open up the motor just yet, and B) Idk anyone around me who would do that. I’d do it myself if I had enough ppl on here tell me that porting it is a must lol. But yea it came with a seat and a new engine cover that isn’t cut for a pipe so I wanna keep it looking clean and put the stock muffler and plastics on it

        Comment


        • #5
          1) Gearing
          2) Carb
          3) Clutch

          Don’t waste your time/money on porting or new pipe or ANY other performance mods until you do these.

          For gearing-
          stock gear ratio on 40s is 6/76 which isn’t even rideable IMO. Bump up to a 9T front sprocket off the bat. Even on a bone stock 40. And the you will get up to a solid 38+mph with a tunable carb. If you really want to haul ***, up to a 10T front. You WILL need a pipe and carb and clutch mod for this gearing. But it’ll get you up to around 42mph.

          For carb-
          I suggest the ADA adjustable carb (the one with a billet manifold from DDM) and learn how to tune it by starting rich and use GPS to track your speed, lean it out until you get max speed/rpm. and then dial it back slightly rich to be safe.

          For clutch-
          Stock engagement is way too low. go with a DDM black magic spring, Or research “gsr40 double clutch spring mod” and do that.
          Last edited by dsport; 10-16-2020, 11:48 AM.
          *******Pedding since '02********

          Comment


          • #6
            Originally posted by dsport View Post
            1) Gearing
            2) Carb
            3) Clutch

            Don’t waste your time/money on porting or new pipe or ANY other performance mods until you do these.

            For gearing-
            stock gear ratio on 40s is 6/76 which isn’t even rideable IMO. Bump up to a 9T front sprocket off the bat. Even on a bone stock 40. And the you will get up to a solid 38+mph with a tunable carb. If you really want to haul ***, up to a 10T front. You WILL need a pipe and carb and clutch mod for this gearing. But it’ll get you up to around 42mph.

            For carb-
            I suggest the ADA adjustable carb (the one with a billet manifold from DDM) and learn how to tune it by starting rich and use GPS to track your speed, lean it out until you get max speed/rpm. and then dial it back slightly rich to be safe.

            For clutch-
            Stock engagement is way too low. go with a DDM black magic spring, Or research “gsr40 double clutch spring mod” and do that.

            Great info bro. That’s exactly what I needed to know. Any thoughts on the flywheel key on this motor?

            Comment


            • #7
              Originally posted by ChevySS06 View Post
              Great info bro. That’s exactly what I needed to know. Any thoughts on the flywheel key on this motor?
              no worries. Do the mods listed above and then consider a timing key if you want. I was able to get a 40 bottom end up to 51mph (flat ground, 180lb rider) with the factory ignition system.

              ive noticed the timing keys make a difference down low, but may limit peak rpm which can actually slow you down (since gopeds are single speed and rely on peak rpm for top speed). If you research 2 stroke ignition timing, you will see this is actually the case.

              HOWEVER, if you do actually consider only using a can muffler, I’d lean more strongly towards trying a rocket key, since the retarded timing does loose more unburnt fuel out the exhaust. And you cannot take advantage of that fuel without a pipe (which essentially functions by using pressure waves to force the unburnt fuel back in)

              hope this helps out
              *******Pedding since '02********

              Comment


              • #8
                Originally posted by dsport View Post

                no worries. Do the mods listed above and then consider a timing key if you want. I was able to get a 40 bottom end up to 51mph (flat ground, 180lb rider) with the factory ignition system.

                ive noticed the timing keys make a difference down low, but may limit peak rpm which can actually slow you down (since gopeds are single speed and rely on peak rpm for top speed). If you research 2 stroke ignition timing, you will see this is actually the case.

                HOWEVER, if you do actually consider only using a can muffler, I’d lean more strongly towards trying a rocket key, since the retarded timing does loose more unburnt fuel out the exhaust. And you cannot take advantage of that fuel without a pipe (which essentially functions by using pressure waves to force the unburnt fuel back in)

                hope this helps out


                So that carb setup is $110.. lol. Have you heard anything about the WT929? I’ll attach a link to DDM, lmk what you think.

                https://www.davesmotors.com/Walbro-W...Engines-WT-929

                $32 right now.. that sounds much better if it’s a good carb. The whole one fuel line thing kinds freaks me out though 😂
                Or.. would the wt1107 work well? Cause I might have one of those on a stock g23lh right now that really doesn’t need it lol

                Comment


                • #9
                  1107 is what you want

                  Comment


                  • #10
                    Originally posted by Hubsondubs View Post
                    1107 is what you want
                    Yea the 1107 is definitely more affordable. Any idea if a 9t front sprocket will work with the factory length chain?

                    Comment


                    • #11
                      Get a chain breaker and some chain

                      Comment


                      • #12
                        Originally posted by ChevySS06 View Post

                        Yea the 1107 is definitely more affordable. Any idea if a 9t front sprocket will work with the factory length chain?
                        Originally posted by Hubsondubs View Post
                        Get a chain breaker and some chain
                        1107 should be ok, make sure you get the manifold too. Won’t fit with your stock one.

                        A 9T front will fit with the stock chain length, you don’t need a chain breaker or chain.
                        *******Pedding since '02********

                        Comment


                        • #13
                          Originally posted by dsport View Post



                          1107 should be ok, make sure you get the manifold too. Won’t fit with your stock one.

                          A 9T front will fit with the stock chain length, you don’t need a chain breaker or chain.
                          Shweeeet, thanks for the help brotha. I’m ordering a new chain since this one is rusted, a 9t sprocket, and that clutch spring. I’ll do those first and then see if I’m gonna keep it.. if I like it a lot I’ll get the carb and go from there.

                          Comment


                          • #14
                            Originally posted by ChevySS06 View Post

                            Shweeeet, thanks for the help brotha. I’m ordering a new chain since this one is rusted, a 9t sprocket, and that clutch spring. I’ll do those first and then see if I’m gonna keep it.. if I like it a lot I’ll get the carb and go from there.
                            If you decide you don't like it for whatever reason, i'll gladly buy if off you. I'm looking for a 40. But good luck with your mods.

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