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GSR25 Engine Swap! ESP 32cc or GP460

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  • GSR25 Engine Swap! ESP 32cc or GP460

    So I’m going to rip off this GZ25N23 off my gsr25. I’m thinking about the ESP modded 32cc Zenoah motor, or the CY460. Both are relatively close in price. I weigh 150lbs and just want to haul ***. Which motor should I go with?? Pros and cons? Im a big Zenoah fan, but I’m open to all suggestions/input. Thanks guys

  • #2
    460 is the bang for buck since y wanna haul ***

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    • #3
      Is there any basic/must have mods to the 460? I’m trying to keep it relatively quiet too. I’ve never owned anything bigger than a big bore 29cc. I just hope the Chung Yang crap holds up for a long time. Only reason I wanna stay Japanese

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      • #4
        I would say just change out the clutch but since u never had anything bigger than the 29cc just get it stock 460 and tune it.before riding it....but for other ppl they have bad luck on them...I never had too much problems with them beside the clutch but thay was my fault for running it and.high gear on some.hills

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        • #5
          Just get the motor when it's on the deal of the week at ddm.....and have fun with it

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          • #6
            Yea well now that it’s time, I’m doing some research on here and I’m just not 100% sold on the 460 yet. The quality just isn’t there and everyone says they’re really loud lol. If the 32cc zenoah will get me going a comfortable 35mph I’d be alright. I found a thread on a G43 mounted to the GSR25 with a custom bracket, that’d be cool but I’m sure it’s either a p.i.t.a. or costly lol. I wanna find more feedback on the G320rc motor

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            • #7
              Originally posted by ChevySS06 View Post
              Is there any basic/must have mods to the 460? I’m trying to keep it relatively quiet too. I’ve never owned anything bigger than a big bore 29cc. I just hope the Chung Yang crap holds up for a long time. Only reason I wanna stay Japanese
              couple notes, if you go with the 32, I’d probably stick with the stock zenoah version. Better reliability and slightly less $$. If you go 460 you’re gonna need to change to a 78mm motor mount (It looks like this is factored into your price), btw these motors are NOT quiet and when you try to make them quiet (ie more restrictive muffler), they get slow. g43 would possibly be another consideration depending on your definition “Relatively quiet” and still get you to 40-42mph and won’t seize out of the box like the 460. Or just go 60 and have a quieter, faster, and more reliable motor than a 460

              The 320/340 will for sure get you to 35, I wouldn’t be surprised if you can get one going close to 40.
              you need to order new gearing at the same time. your stock gears will not be tall enough. A new front sprocket will suffice, go up atleast a couple teeth.
              Last edited by dsport; 10-13-2020, 03:24 PM.
              *******Pedding since '02********

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              • #8
                Thanks for the reply dsport. Funny cause the guy at DDM told me the same regarding the G320 engine. I just figured a ported motor would give me some better torque on a bigger Ped. What kind of gearing would I need for that motor to do 40mph?? And as for that G43 motor, I’d love to have that zenoah reliability and the big cc’s. I could possibly fab a bracket if I knew what else I needed and how much it would cost me to do so. The 320 is just bolt on and go correct? No opposite rotation issues or anything?

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                • #9
                  Originally posted by ChevySS06 View Post
                  Thanks for the reply dsport. Funny cause the guy at DDM told me the same regarding the G320 engine. I just figured a ported motor would give me some better torque on a bigger Ped. What kind of gearing would I need for that motor to do 40mph?? And as for that G43 motor, I’d love to have that zenoah reliability and the big cc’s. I could possibly fab a bracket if I knew what else I needed and how much it would cost me to do so. The 320 is just bolt on and go correct? No opposite rotation issues or anything?

                  you wouldn’t need to custom fab anything to fit the g43, but you’d need to swap your current motor mount for a 78mm.

                  to calc the gearing, I need to know your current gearing and the peak rpm the engine is capable of and what type of terrain is around you (hills/flat etc). I’m not super familiar with the 32s so it would be sort of a guesstimate but I should be able to get you close.

                  For 150lbs-190lbs rider the optimum ratio for a g43 is around 1.18 stock (9/72 gears*10” wheel), 1.25 modded , but you can go as high as 1.31 if you’re going for all out top speed (no torque), I wouldn’t go taller than that or your top speed will start to drop. The g320 will be a smaller number, maybe 1.00 to 1.11, let me know which route you go and I can give you a recommendation.
                  Last edited by dsport; 10-14-2020, 04:48 PM.
                  *******Pedding since '02********

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                  • #10
                    My buddy just clocked his g320 (the ESP version) at 43mph. Stock with a pipe. Even has the factory air box. This is surely the most cost effective route to get your ped into the 40mph club.

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                    • #11
                      Originally posted by dsport View Post


                      you wouldn’t need to custom fab anything to fit the g43, but you’d need to swap your current motor mount for a 78mm.

                      to calc the gearing, I need to know your current gearing and the peak rpm the engine is capable of and what type of terrain is around you (hills/flat etc). I’m not super familiar with the 32s so it would be sort of a guesstimate but I should be able to get you close.

                      For 150lbs-190lbs rider the optimum ratio for a g43 is around 1.18 stock (9/72 gears*10” wheel), 1.25 modded , but you can go as high as 1.31 if you’re going for all out top speed (no torque), I wouldn’t go taller than that or your top speed will start to drop. The g320 will be a smaller number, maybe 1.00 to 1.11, let me know which route you go and I can give you a recommendation.

                      So DDM tells me the G43 will not work on my gsr25 frame.. I found a thread on here by ScooterScott on how to adapt this motor to fit my frame. He needed to grind down some spots on the ADA 78mm mount for the G43 to bolt on to it. Then since the G43 is a bottom-mount motor, I’m reading that the fan cover isn’t strong enough to support the weight of the motor, so a custom bracket needs to be made for the bottom..


                      Comment


                      • #12
                        Originally posted by knakib1 View Post
                        My buddy just clocked his g320 (the ESP version) at 43mph. Stock with a pipe. Even has the factory air box. This is surely the most cost effective route to get your ped into the 40mph club.



                        Thanks for the reply man! What kind of Ped is it on, a sport? I haven’t seen or heard of a 320 on a gsr.

                        Comment


                        • #13
                          Originally posted by ChevySS06 View Post


                          So DDM tells me the G43 will not work on my gsr25 frame.. I found a thread on here by ScooterScott on how to adapt this motor to fit my frame. He needed to grind down some spots on the ADA 78mm mount for the G43 to bolt on to it. Then since the G43 is a bottom-mount motor, I’m reading that the fan cover isn’t strong enough to support the weight of the motor, so a custom bracket needs to be made for the bottom.
                          This sounds strange to me. The g43L is a trimmer engine (like a weed wacker). It’s specifically designed to be mounted from the fan cover. The bottom holes are intended for a gas tank, but you will need to grind the engine mount for fan cover clearance. I’d be interested to hear of anyone who has had a 43 fan cover fail due to mounting this way.
                          *******Pedding since '02********

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                          • #14
                            Originally posted by SJ View Post

                            I know what you were referring too, and I am well aware of the 'rumor' that a G43L fan cover is somehow weaker than all of the other motors mentioned above. But, because I have a G43L mounted to an ADA Billet mount on a GTR frame, and a G43L bottom end with a CP51 top end mounted to an EVO2X, along with personal experience with the scooters and motors mentioned above, it is my opinion that that 'rumor' is inaccurate. My question is...I wonder why some people would choose to spread such a misleading rumor, and what would and "porting" have to do with how the motor mounts?
                            an old post I dug up
                            *******Pedding since '02********

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                            • #15
                              Well... just bought a used GSR40 for $360 lol. Starts and runs decent, has a pipe on it.. but the clutch is either no good or the spring broke or something. I’ll tear it down this weekend and see. I’ll probably end up making a new thread on what to do to this motor now lol

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