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460 has super slow acceleration

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  • 460 has super slow acceleration

    Wassup guys I just got a gsr46r with Jetpro cruiser pipe and 223 carb. 9/72 gearing. The same gearing on my gsr40 (stock 430, 1107, pac sales racer pipe) hits 36 but has wayy better acceleration. I was under the impression the 460 would be wayyy faster with the same gearing...especially getting up to the powerband. Now don't get me wrong, once the powerband hits, it's great. I can pull on cars easily. But getting there is ridiculously slow. Even on flat ground. A little wind? Stuck at 20mph. Slight hill? Not a chance. Any ideas?

  • #2
    Originally posted by cky_ej29 View Post
    Wassup guys I just got a gsr46r with Jetpro cruiser pipe and 223 carb. 9/72 gearing. The same gearing on my gsr40 (stock 430, 1107, pac sales racer pipe) hits 36 but has wayy better acceleration. I was under the impression the 460 would be wayyy faster with the same gearing...especially getting up to the powerband. Now don't get me wrong, once the powerband hits, it's great. I can pull on cars easily. But getting there is ridiculously slow. Even on flat ground. A little wind? Stuck at 20mph. Slight hill? Not a chance. Any ideas?
    Pull the head and see if it’s seized. I’m betting it is.
    *******Pedding since '02********

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    • #3
      Originally posted by dsport View Post

      Pull the head and see if it’s seized. I’m betting it is.
      I mean its cool once it gets to the powerband though

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      • #4
        Not sure if red or yellow clutch springs make a difference or if it’s worn out. Just Got a GTR myself and was only able to test ride a little. Not a Goped expert by any means tho.

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        • #5
          Originally posted by cky_ej29 View Post

          I mean its cool once it gets to the powerband though
          ^^ this is what makes me think it’s seized. It’s up to you of course. You don’t have to pull it. But then you may always be chasing power (or lack of) issues. A 460 acceleration should be extremely close to a 40. The gearing your running is spot on for that setup. Could also be a carb, but normally if it was a fuel issue (especially a lean fuel issue) it was cause the cylinder to seize anyway.
          Last edited by dsport; 02-14-2020, 02:55 PM.
          *******Pedding since '02********

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          • #6
            If you don’t want to pull the whole head you can also pull the exhaust and look in there with a flash light. Look at the piston skirt and inner cylinder wall. You can also do the same with the intake, but seizure will normally occur on the exhaust side first.
            *******Pedding since '02********

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            • #7
              Originally posted by dsport View Post
              If you don’t want to pull the whole head you can also pull the exhaust and look in there with a flash light. Look at the piston skirt and inner cylinder wall. You can also do the same with the intake, but seizure will normally occur on the exhaust side first.
              If it's seized it ain't even gonna run, or turn over

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              • #8
                I'm gonna look at the clutch first.

                my stock gsr40 with pipe and carb takes off wayyy faster with same exact gearing.

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                • #9
                  Originally posted by rayrayebh22 View Post

                  If it's seized it ain't even gonna run, or turn over
                  You couldn’t be more wrong, but I guess it’s my fault for not clarifying. I’m talking seizure damage ie piston/cylinder scoring, not seized as in completely locked up.
                  *******Pedding since '02********

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                  • #10
                    Originally posted by dsport View Post

                    You couldn’t be more wrong, but I guess it’s my fault for not clarifying. I’m talking seizure damage ie piston/cylinder scoring, not seized as in completely locked up.
                    So I am wrong, blownin a top end means what u saying G. SIEZED UP NO MOVEMENT

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                    • #11
                      Originally posted by rayrayebh22 View Post

                      So I am wrong, blownin a top end means what u saying G. SIEZED UP NO MOVEMENT
                      Righttt... normally we would refer to this type of damage (piston scoring/galling) as seizure damage since it’s caused by a resistive forces between 2 sliding surfaces. A complete seizure would be what you are referring to.

                      https://www.millennium-tech.net/pistonTrouble.php

                      ”blowing up” a motor can have multiple interpretations. This term would normally be associated with catastrophic failure from throwing a rod to cracking a piston, seizing a cylinder, anything mechanically bad really.
                      *******Pedding since '02********

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                      • #13
                        Originally posted by dsport View Post

                        Righttt... normally we would refer to this type of damage (piston scoring/galling) as seizure damage since it’s caused by a resistive forces between 2 sliding surfaces. A complete seizure would be what you are referring to.

                        https://www.millennium-tech.net/pistonTrouble.php

                        ”blowing up” a motor can have multiple interpretations. This term would normally be associated with catastrophic failure from throwing a rod to cracking a piston, seizing a cylinder, anything mechanically bad really.
                        Yep exactly, like your stuff G. Ya looking at these pics this cat needs a new top end from Dave's, we all done this a few times.
                        Last edited by rayrayebh22; 02-16-2020, 11:12 PM.

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                        • #14
                          Very interesting port job there. Way too much taken off the top of that piston, and intake port is raised. I would’ve changed that top end anyway.
                          *******Pedding since '02********

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                          • #15
                            Originally posted by dsport View Post
                            Very interesting port job there. Way too much taken off the top of that piston, and intake port is raised. I would’ve changed that top end anyway.
                            Dude on Instagram says the piston shaving is what is causing the lack of low end. Maybe the previous owner didn't notice due to being significantly lighter than I am. It does work but im 220lbs and it takes wayyy to long to get to the powerband.

                            glad I opened it up though and finally found the cause.

                            new topend kit, gasket and spark plug on the way. Hopefully be tearing it up hitting 45

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