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My first Goped: GSR40 TSi

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  • My first Goped: GSR40 TSi

    My goal: Own a reliable gas powered cruiser budget scooter (preferably a Goped I guess) that goes 35-40 mph

    My GSR40 isn't in great condition, at least the engine. I overheated it in the first week I bought it, so now it needs new rings, a piston, and a cylinder. When I bought it, the Trevor Simpson edition (who the hell is Trevor Simpson anyways??) Zenoah G43L-D it had was close to stock. It just had a tuned pipe (not made by Jet Pro) and the "Trevor Simpson Ported" Cylinder, that came with the engine. The intake didn't even fit the WYK carb, the pulse line didn't align with the carb. So I bought this intake manifold kit from ADA: https://adaracing.com/goped-parts/go...ld-kit-go-ped/

    I should have found and joined this forms earlier. I should have bought a different carburetor and probably not that intake manifold. Anyways, I cleaned and rebuild the engine. I have a moded Goped Geo ignition coil on it and some heat tape on the exhaust. The gearing it came with was 6/76. I bought a matching Kenda tire for the rear, a new clutch bell, and changed the gearing to 7/76. I don't think I had the chain tight enough, so I ripped all the teeth off on my drive sprocket. I need to get another drive sprocket, so I think i'll try 8/76 this time. After taking a closer look, I think I need to get another rear sprocket too.

    I've been told to change my gearing when I had it at 6/76, to get a uni filter, a Rhino pipe, and to swap carbs, on YouTube. https://www.youtube.com/watch?v=t5SNpvT5uBI

    I'm guessing that everyone's going to say I need to get a GP460 and chuck the G43L-D or something like that. But i'm pretty much brand new to Gopeds, so I would really like to hear what other people have to say.

  • #2
    G43 is fine. If you want to hit those speeds on a stock cylinder you’re gonna need 9/76 minimum. This will get a stock g43 (and proper tunable carb) up to about 32mph, with pipe maybe at a couple more mph. I was able to get my tsi up to about 40 with 10/76, but this definitely taller than I’d recommend for average riding. Get a stiffer clutch spring or weld the current one to give you more slip to compensate for the acceleration lost due to the taller gearing.
    *******Pedding since '02********

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    • #3
      Originally posted by dsport View Post
      G43 is fine. If you want to hit those speeds on a stock cylinder you’re gonna need 9/76 minimum. This will get a stock g43 (and proper tunable carb) up to about 32mph, with pipe maybe at a couple more mph. I was able to get my tsi up to about 40 with 10/76, but this definitely taller than I’d recommend for average riding. Get a stiffer clutch spring or weld the current one to give you more slip to compensate for the acceleration lost due to the taller gearing.
      I did buy the stock cylinder from DDM for my rebuild, but the ports were so much more smaller than the ports on the TS ported cylinder that I ruined. So I sent it back to DDM to exchange it for the ESP Race Ported cylinder. And what would you know? It's on sale this week until Friday . I hope I get the discount with the exchange and save ~$20. For a carb, I looked at this fourm: https://www.billetboard.com/forum/sc...ch-talk/15453-

      I decided i'm getting the WT-1107, a Carburetor Linkage for CY Engines, and a few other carb necessities from DDM. I'm wondering if i'll have to drill out the hole in the throttle body where the linkage hooks up to fit the wa/wt carburetor swivel kit so I can use my throttle cable with the carburetor.

      I stole the generic wt carb from my rovan baja 5b and put it on my G43L-D and the freakin engine ran without even changing the mixture screw settings from the rc car XD. Anyways, this proves to me first-hand that a wt style carb can work on a G43L-D, even with the ADA billet manifold meant for the stock WYK carb.

      For a clutch spring? I swapped out the stock spring for a DDM Black Magic Spring for the G43L, but I was disappointed by it because I didn't notice any difference in stiffness from the stock spring. So, I guess I will try these Toymaker Replacement GSR40 Clutch Spring Set from DDM. I hope they wont be too stiff or something like that. I know its for the GP460.

      Since I tore up my 7 tooth that I bought from DDM, are there any tips for not destroying a brand new 9 tooth sprocket?
      Last edited by RabbitFootKitty; 10-06-2019, 02:03 PM.

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      • #4
        There are other ways to mod the clutch spring for higher stall. Also, you should never be destroying a front sprocket like that. What tensioner are you using?
        *******Pedding since '02********

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        • #5
          Originally posted by dsport View Post
          There are other ways to mod the clutch spring for higher stall. Also, you should never be destroying a front sprocket like that. What tensioner are you using?
          Yeah, I had my Chinese scooter welded by a local welder a while ago, but I didn't want to get the clutch spring welded, so I bought those springs. I'm using the chain tensioner that came with the scooter, which is a TGN adjustable chain tensioner. My chain is binding, due to the previous owner's neglect and weather, so that could be a factor of why I tore up the front sprocket. However, I didn't have any sprocket problems before I changed the sprocket from 6 tooth to 7, so It's likely my fault somehow, too tight or too loose.

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          • #6
            ^^ I was referring to the double clutch spring mod, also the offset clutch spring hole mod. Both involve drilling extra holes in the clutch shoe which can time consuming. I haven’t tried the TM springs but have read they are not very aggressive by design. I don’t think you’d notice much of a change vs. the black magic spring. If you’re going through sprockets you’re alignment is most likely off. Pull the tensioner off and confirm both the motor and wheel sprockets are aligned vertically.
            *******Pedding since '02********

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            • #7
              Originally posted by dsport View Post
              ^^ I was referring to the double clutch spring mod, also the offset clutch spring hole mod. Both involve drilling extra holes in the clutch shoe which can time consuming. I haven’t tried the TM springs but have read they are not very aggressive by design. I don’t think you’d notice much of a change vs. the black magic spring. If you’re going through sprockets you’re alignment is most likely off. Pull the tensioner off and confirm both the motor and wheel sprockets are aligned vertically.
              I’m not familiar with the “offset clutch spring hole” mod, but If I we’re to guess, It would be drilling 2 holes, almost like for the dual spring mod, but the holes would be drilled in a spot on the clutch pad that will give a mechanical advantage to a single spring, compared to the stock holes.

              I will be attempting the dual spring mod. I recently bought a brand new drill as well. I changed my order, twice, the second time late in the ordering process, and I bought another DDM Black Magic spring. I hope DDM isn’t too frustrated with me lol.

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              • #8
                So I might as well score 2 top-ends with 1 goped: Where can I find a replacement element for this TGN air filter? And if none are available, what should I get to make a new element? I forgot to show the sprocket that I died of death, but there it is, on top of the filter housing. Also, there is a good picture of the dual clutch mod I found here: https://www.billetboard.com/forum/sc...for-sale/9421-

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                • #9
                  Any type of similar foam would work and just cut it. Perhaps DDM part AF241
                  Last edited by ESR_RSE; 10-09-2019, 02:12 PM.

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                  • #10
                    I prefer an offset single black magic spring to a dual spring, but once you drill the holes you can try both.
                    *******Pedding since '02********

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                    • #11
                      I was just going to install this ESP ported cylinder from DDM onto my engine, and ring gaps crossed my mind when I was installing the rings onto the new piston. One of the old rings in the TS ported cylinder measured to be 0.020 of an inch. I placed one of the new rings in the ESP ported cylinder and the gap was much smaller than the gap between one of the old rings and TS ported cylinder. I measured the gap and it was around 0.008 of an inch. Is that too small? What would be a ball-park size for an everyday-running reliable cruising engine? -Screw racing... I'm trying to find specs from a g43l owner's manual online or something or maybe on the forums. Also not related that much, is the pipe i'm using, from the pictures above, a decent pipe for top end?

                      Comment


                      • #12
                        Originally posted by dsport View Post
                        I prefer an offset single black magic spring to a dual spring, but once you drill the holes you can try both.
                        Very true . Btw I thought I could drill the holes using a freakin cordless drill, how stupid was I. I know someone with a drill press, that will probably work.

                        Comment


                        • #13
                          When I first bought the scooter, about 3 weeks ago now, it came with an unknown amount of fuel in the tank and the gas can it came with, unknown octane level, and an unknown fuel age. The previous owner TOLD me that he mixed it at 25:1 with Yamalube (not sure what kind of Yamalube he used, he didn't say), but I DON'T TRUST NOPONY! He also didn't have a freaking gas cap for the can it came with. We literally had to go to a store when I was purchasing the scooter to buy a plastic bag or something to make sure no god damn fuel leaked all over my dad's car. He told me the gas can sat in his freaking closet with no cap. I'm wondering if this contributed to my engine seizure.

                          Anyways, my question: I am running 92 octane E-10 from a local Arco with no fuel stabilizers of any kind at ~25:1 using Castor927. I've been using E-10 gasoline for years now and it has worked absolutely fine for me, all the time. I believe people blame ethanol for almost any fuel-related issues and don't focus as much on using proper storage/handling techniques, or the carburetor, or it's settings. Is 25:1 w/Castor927 a good ratio for cruising? The G43L-D wiki: https://scooter.fandom.com/wiki/Zenoah_G43L-D, says that the fuel to oil mixture to use with this engine is 40:1. Is it too dangerous to run it as lean as 40:1? What ratio should I use?

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                          • #14
                            What break-in procedure should I follow for my rebuilt G43L-D with a new piston and ESP ported cylinder? I have too many questions...

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                            • #15
                              ORB folks have a break in video on youtube

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