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CY GP460 Piston scorching on exhaust side

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  • CY GP460 Piston scorching on exhaust side

    Hey pedders, been a lurker for awhile. Decided to buy a used trail ripper a month ago. In good condition, but the engine was seized and the carb needed a rebuild. I installed the headkit last week, broke it in running the l % h needles rich, kept the throttle light. I ran 1:25 castor 927 with 91 unleaded fuel. All week it's been running good all week until today. Was holding back some power it felt. Decided to take the head off and see how it broke in... The ring wasn't seized, by the way.




    Any suggestions as why this would be happening would be great. Thanks ya'll.

  • #2
    That plug looks lean to me what did you say the needles where set at ? For basic 223 carb settings I would suggest 2 full turns on the high and 1.5 full turns on the low for starters .
    PEDFEST 2013 ALUMNUS
    PEDFEST 2014 ALUMNUS
    PEDFEST 2015 ALUMNUS

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    • #3
      Originally posted by greenborroco View Post
      That plug looks lean to me what did you say the needles where set at ? For basic 223 carb settings I would suggest 2 full turns on the high and 1.5 full turns on the low for starters .
      that top end is fine, i bet with some cleanup and fine detail the piston is fine as well...
      Matt Etchells
      Flash-Systems ltd.

      [email protected]

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      • #4
        I was running around 1.5 on the low and 2.50 on the high. Was planning to run it at this for 2 tanks of fuel. then start leaning it finely.

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        • #5
          Originally posted by Mattetch View Post
          that top end is fine, i bet with some cleanup and fine detail the piston is fine as well...
          The piston scorching like that is not problematic in the long run? I will clean it all up with some fine grit sand paper. I have an extra ring incase.

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          • #6
            Originally posted by djrabbit View Post
            The piston scorching like that is not problematic in the long run? I will clean it all up with some fine grit sand paper. I have an extra ring incase.
            That's some nasty blowby. Make sure you have a good ring seal when you get it running again. Looks like you have some junk up in that engine too by the looks of some of the scoring. Looks like you have more than enough fuel to keep it lubed. That's way too much damage for a newer top end. Your not beating the living crap and overheating the engine are you? I suggest double checking for air leaks as it can cause results like this...
            Last edited by somsom; 11-05-2014, 08:14 PM.

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            • #7
              Originally posted by somsom View Post
              That's some nasty blowby. Make sure you have a good ring seal when you get it running again. Looks like you have some junk up in that engine too by the looks of some of the scoring. Looks like you have more than enough fuel to keep it lubed. That's way too much damage for a newer top end. Your not beating the living crap and overheating the engine are you? I suggest double checking for air leaks as it can cause results like this...
              I'm babying this engine, WOT for very short amount of times. Should i check for air leaks in the crank case and in the crank bearings? and what is a way to check for sure since the gp460 doesnt use a gasket for the crank case. Thanks for the response.

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              • #8
                Originally posted by djrabbit View Post
                I'm babying this engine, WOT for very short amount of times. Should i check for air leaks in the crank case and in the crank bearings? and what is a way to check for sure since the gp460 doesnt use a gasket for the crank case. Thanks for the response.
                I use a very small bead of black rtv to seal up my crankcase. make sure that your gas filter hasn't fallen out and letting particles in your gas go into your engine. I would put a new ring on that and run'er till she stops. When you get the new ring, make sure to sand down the burs on the edges with very fine sand paper, makes a huge difference.
                Gsr40/46 full mod, Gsr26/46 race build, VCG VenturaCoastGopeds Krew

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                • #9
                  Thanks everyone for the help, I took apart the bottom end and placed some new liquid gasket along the face. I also cleaned up the piston and cylinder, placed with the new ring. The liquid gasket from the factory was pretty bad from the looks of it. Hopefully i wont have to keep working on this damn motor, wanna get on the trails!

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                  • #10
                    ok im a new person the the 460 ada headkits so this is what ive done so far.

                    i run 32:1 pens sys 2 stroke oil and i mash on it like i stole it. my low is at 1.5 and high is at 2.25 unported 13:1 compression. i run 91 octane on my caddy (bladez) its close to a 70 lb scooter. i have an 06 cyl thats on the headkit. and shes not slow by any means. hope this helps ya.

                    not sure if this can be used as a guideline to get started on tuning, these settings seem to be in a some what close settings most run.
                    as we ride we are free to fly, when we walk gravity chains us down to the world

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                    • #11
                      Originally posted by Mattetch View Post
                      that top end is fine, i bet with some cleanup and fine detail the piston is fine as well...
                      I hope that was a joke

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                      • #12
                        Originally posted by f1gopedder View Post
                        I hope that was a joke
                        nope not a joke, the seizure is soft not hard
                        Matt Etchells
                        Flash-Systems ltd.

                        [email protected]

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                        • #13
                          I installed the headkit last week, broke it in running the l % h needles rich, kept the throttle light. I ran 1:25 castor 927 with 91 unleaded fuel.
                          That's why, this is like the 2nd or 3rd thread where this has happened.

                          If you want to run a head kit on a 460 you MUST run race fuel. 110 leaded is what you should be running or similar/close.

                          91 on a stock 460 alone barely cuts it.

                          (Besides, what's the point of buying a HK, if you aren't even running race fuel to utilize that extra power..)
                          sigpic

                          My GoPed Build: http://goo.gl/0oYHVj

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                          • #14
                            Originally posted by contract View Post
                            That's why, this is like the 2nd or 3rd thread where this has happened.

                            If you want to run a head kit on a 460 you MUST run race fuel. 110 leaded is what you should be running or similar/close.

                            91 on a stock 460 alone barely cuts it.

                            (Besides, what's the point of buying a HK, if you aren't even running race fuel to utilize that extra power..)
                            oppsie! Why did i say headkit... I meant the gp460 Big-Bore Kit ha..ha.. My 460 is completely stock.

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                            • #15
                              are you really running 1:25 or 25:1? 25:1 is 5.2 ounces per gallon. buy a new topend and break it in the right way, use a billet intake mani with fresh gaskets and you should be golden. that topend is trash.

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