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Blown GP460

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  • Blown GP460


    Been pedding for 20+ years, and love it. I finally saved up the cash for a GTR-i. I love this GoPed. I have been riding on a bigfoot for what seems like ever. anyways, I was recently cruising on my GTR-i and where I live there is a large bridge to leading to the beach. On the ride down the bridge I was running about 35 mph, or about 10,800 RPM. Not sure what happened next, whether I gave it more gas or lifted the throttle, but I heard pop something blew internal to the engine. When it happened there was sudden lose of power, but at the speed I was going the motor hadn't turned off. I could give it gas and go, but I new I shouldn’t because of the sound the motor was making. When I pull the start-line it sounds like marbles in the chamber. Don’t think I blew a rod as it will still want to start.

    So, I don't know much about motors and how things work. I am very good at following directions and YouTube videos to accomplish tasks. I've pulled the motor off the Ped and will start a break down when I have time this week. Two questions come to mind,

    First question: best and worst case scenario for fixing.

    Second: what do you think happened? I have thought about this for a while and don’t have answer.




    GoPed trial ripper

    6 / 68 sprocket

    Jet pro rhino exhaust

  • #2
    I'd get a pnw 63cc engine next. Pnwporting.com

    Those engines have much more torque are much more reliable than a gp460.

    Comment


    • #3
      My guess it’s the top end. DDM has everything for around $80, you may need bearings for the piston. Also ADA makes a nice top end kit as well that adds to the power output a bit money but doesn’t break the bank. Be sure to reply with your findings, I have the same motor.

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      • #4
        Pictures! Someone posted that often there are leaks on GP460s which can lead to a lean air/fuel and damage the motor. That or sand wore down your cylinder.

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        • #5
          Once I start taking the motor apart and find the culprit I will post pictures and my progress. I will definitely look for oil leaks before the breakdown.

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          • #6
            So, i have taken the motor off the Ped and began to break it down. First off there seems to be a bit more oil/grime on it than I would expect for four month old tank-of-gas a week Trail Ripper. With that aside, after taking off the jet pro and plastic covers, I took off the pull start and noticed a hole in the casing. I took the casing off to find that the ignition coil mount failed, explaining the hole in the case. When the mount failed, it messed up the flywheel and coil. Wonder if this is warranty-able. Probably not since I took it apart. Doh!!!
            Attached Files

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            • #7
              Well looks like you found your problem. New coil amd flywheel. Not too bad. You could run the flywheel as is but I wouldnt. Every one of those fins provides vital cooling.

              I'd keep the 460 and avoid a 63cc. 460's are solid motors, and have so much potential, if built and ported properly.

              Here's some tips on building a leak free engine. LIGHTLY dress both sides of ALL your gaskets with Hylomar blue. Yes it's gas and oil resistant.

              People who trust a gasket to provide a perfect air tigjht seal have probably not used a leak down tester before which brings me to another tip in a leak free engine. Buy or make a leak down tester for your ped and use it. Dont be surprised if you see leaks coming out of gasketed surfaces. This is what Hylomar fixes.

              Also the 2 oil seals. They wear down riding against the crankshaft and become prone to an airleak over time. Cheap fix. But here's the kicker!

              Over an even longer amount of time, the oil seal will eventually groove out the crankshaft to the point of where a new oil seal will not be able to create an air tight seal, only a new a crankshaft. Again, this takes a long time to happen but it does happen and is something to certainly be aware of!

              An air tight motor will not only increase it's longevity but will yield better performance.

              Comment


              • #8
                Great recommendations for all motors. Btw I put blue loktite on those coil bolts. Had one slip on me and stop a ped dead. Luckily was during a slower turn.

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                • #9
                  Some extra information. After a week or so, I have been thinking about what led up to this. In the rides (3 or 4) leading up to the damage above. I did feel a vibration setting in and progressively getting worse. I am starting to get the feeling that after every ride, I need to pull parts off for inspection and make sure everything is good to go. If I were a betting/guessing person, I would place money that my fly wheel got chipped and went out of balance.

                  thanks you all for the replies!!!

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                  • #10
                    ya just maybe.

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                    • #11
                      So after another weekend of riding, I took the motor covers off to clean and inspect. What i found is not inspiring. I believe I have found a challenge that started this problem in the first place. There are two screws that hold the ignition coil to the fan cover. The top screw is shearing off, then the vibration loosens the other screw and well you know the rest. It was a great catch, but now I need to find out how to fix the issue so I can ride longer than a tank and half of gas, per screw.

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                      • #12
                        JBWeld the holes and then re-tap them.

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                        • #13
                          Luckily no damage to the threads!!

                          I get fixing quickly and getting back out, that part is already done. I am trying to find out why this keeps happening on a less than 5 month old Trail Ripper. Surely im not the only person breaking bolts on their GP460's, heck im only going 38 MPH max and feel like I have to carry a tool box full of parts and tools to go on ride. Simply annoying.

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                          • #14
                            Originally posted by JLRod View Post
                            Luckily no damage to the threads!!

                            I get fixing quickly and getting back out, that part is already done. I am trying to find out why this keeps happening on a less than 5 month old Trail Ripper. Surely im not the only person breaking bolts on their GP460's, heck im only going 38 MPH max and feel like I have to carry a tool box full of parts and tools to go on ride. Simply annoying.
                            Loctite everything...
                            *******Pedding since '02********

                            Comment


                            • #15
                              https://www.billetboard.com/forum/sc...954#post330954

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