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Newly restored yezdi engine seizure and sound

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  • #1

    Newly restored yezdi engine seizure and sound

    I've encountered a
    problem in my Yezdi Classic. I had it recently restored in Mysore. Even had a rebore done. Second oversize, IPL piston. Soon after the
    restoration was done I took it out on a ride and after a sometime the engine seized. Later I took
    it back to the garage and then after running it idle for sometime the next day the problem doesn't exist. But then there was a weird itching or that sound which you can hear, where we can feel there is friction contact between the piston and cylinder. It's like in two strokes as we know we jus give and lot of throttle and then don't
    suddenly d piston still continues to reciprocate in the cylinder without any supply of fuel, that
    is when I can hear the sound very clearly. I don't know if it's the rings or the piston skirt touching the wall or rough wall. Today on my way to Manipal after pretty small hilly ride I could feel that sound increasing, and i came to
    know that the sound will increase and the engine will seize. So I just stopped the bike not taking
    any risks. But even now that sound exists and i feel even now at higher working temperature
    and loads the engine will seize.
    And the bike has already done
    1200km after restoration. And I put 50ml oil for a litre of petrol. Thank you for your time. What could be the possible reason causing this and what would be the solution?
    Tags: None
  • #2
    Re: Newly restored yezdi engine seizure and sound

    Query Approved.

    The post is quite contradicting, first you've said your engine has seized, and then you've mentioned you were able to idle it after you took it to the garage, did you replace your pistons after a seizure, or was it just a temporary heat induced stall, that's one.

    Secondly, you shouldn't hear any itching or rubbing noise from the cylinder, either you're rings are improperly/wrongly installed or out of whack or worse case wrong piston used even mm difference can cause unwarranted trouble, unless proper measures/inspection/compatibility were done prior to installing the piston. Do you have a pic of the piston head?

    Once a seizure occurs, you're done, you won't be able to crank the engine, no matter what.

    Cheers!
    VJ
    Once upon a time, a guy asked a girl 'Will you marry me?'
    The girl said, 'NO!'


    And the guy lived happily ever after and rode motorcycles and watched sport on a big screen TV, went fishing and surfing, and played golf a lot, and drank beer and scotch and had tons of money in the bank and left the toilet seat up and farted whenever he wanted.


    THE END

    Comment

    • #3
      Re: Newly restored yezdi engine seizure and sound

      Putting 50ml of 2t oil is too much i feel, even for a rebored engine 30 or 40ml is the maximum oil one should use, more oil will only lean the mixture which will then heat up the piston and rings.

      Comment

      • #4
        Re: Newly restored yezdi engine seizure and sound

        Originally posted by kusmaker View Post
        Putting 50ml of 2t oil is too much i feel, even for a rebored engine 30 or 40ml is the maximum oil one should use, more oil will only lean the mixture which will then heat up the piston and rings.
        50 ml is the recommended amt for the czech engines no issues with that
        [MENTION=62720]ashishdpinjar[/MENTION] :arnt you the guy who went for cb points despite being advised against it
        Kawasaki KB100/enduro/125 substitute parts list http://www.xbhp.com/talkies/508615-post105.html

        Comment

        • #5
          Re: Newly restored yezdi engine seizure and sound

          Originally posted by B7ACKTHORN View Post
          Query Approved.

          The post is quite contradicting, first you've said your engine has seized, and then you've mentioned you were able to idle it after you took it to the garage, did you replace your pistons after a seizure, or was it just a temporary heat induced stall, that's one.

          Secondly, you shouldn't hear any itching or rubbing noise from the cylinder, either you're rings are improperly/wrongly installed or out of whack or worse case wrong piston used even mm difference can cause unwarranted trouble, unless proper measures/inspection/compatibility were done prior to installing the piston. Do you have a pic of the piston head?

          Once a seizure occurs, you're done, you won't be able to crank the engine, no matter what.

          Cheers!
          VJ
          Yes it is a heat installed stalling. It starts again once the engine is cooled. And I've been in that situation where I couldn't crank the engine at all, that was when I started the engine for the first time after restoration. The bike vibrated totally and stopped and the kicker wouldn't go down. But then as I said the problem was resolved. But when subjected to too much load on engine I think it heats up a lot. And this time I stopped the engine as soon as I got the slightest hint that the bike is going to vibrate totally and stop. Isn't that engine seizure?? I don't have a pic. :/
          Last edited by ashishdpinjar; 08-31-2014, 11:29 AM.

          Comment

          • #6
            Re: Newly restored yezdi engine seizure and sound

            Originally posted by kb100 View Post
            50 ml is the recommended amt for the czech engines no issues with that
            [MENTION=62720]ashishdpinjar[/MENTION] :arnt you the guy who went for cb points despite being advised against it

            Yes I am the one. :P and yeah that's the recommended oil amount.

            Comment

            • #7
              Re: Newly restored yezdi engine seizure and sound

              And it feels like the high temperature is causing the expansion of either the piston or the rings or the bore surface is rough. Have anyone else encountered the same problem? And even when the engine is just fired up, when listened carefully I can hear that metal to metal rubbing or itching sound.

              Comment

              • #8
                Re: Newly restored yezdi engine seizure and sound

                remove the cylinder and asses the damage yourself before you ruin the bore
                Kawasaki KB100/enduro/125 substitute parts list http://www.xbhp.com/talkies/508615-post105.html

                Comment

                • #9
                  Re: Newly restored yezdi engine seizure and sound

                  Originally posted by kb100 View Post
                  remove the cylinder and asses the damage yourself before you ruin the bore

                  Yes bro!!! I gotta do that. Gotta take it to Mysore. It's in udupi now :\

                  Comment

                  • #10
                    Re: Newly restored yezdi engine seizure and sound

                    Originally posted by ashishdpinjar View Post
                    Yes bro!!! I gotta do that. Gotta take it to Mysore. It's in udupi now :\
                    There is the Yezdi riders club in Mangalore, some of them members on xbhp who might help you with your problem.
                    Yamaha RX 135 5 Speed - 2000 -(current)
                    Yamaha R15 v1 - 2009 - 2016 ( Sold )
                    Yamaha R3 - 2015 - (current)

                    Comment

                    • #11
                      Re: Newly restored yezdi engine seizure and sound

                      Originally posted by ashishdpinjar View Post
                      Yes it is a heat installed stalling. It starts again once the engine is cooled. And I've been in that situation where I couldn't crank the engine at all, that was when I started the engine for the first time after restoration. The bike vibrated totally and stopped and the kicker wouldn't go down. But then as I said the problem was resolved. But when subjected to too much load on engine I think it heats up a lot. And this time I stopped the engine as soon as I got the slightest hint that the bike is going to vibrate totally and stop. Isn't that engine seizure?? I don't have a pic. :/
                      Overheating is precursor for seizure, and indeed falls in that category. 50ML is not a bad ML limit, but for spirited riding, I'd personally recommend 60 ML if you don't mind the smoke. Secondly two strokes are all about lubrication and on time, heat is the enemy to any engine, especially two strokes. But if you have vibes, stalling and heat induced stalling, do get your piston clearances checked once again, at least that's what I can guess of at this stage.

                      Cheers!
                      VJ
                      Once upon a time, a guy asked a girl 'Will you marry me?'
                      The girl said, 'NO!'


                      And the guy lived happily ever after and rode motorcycles and watched sport on a big screen TV, went fishing and surfing, and played golf a lot, and drank beer and scotch and had tons of money in the bank and left the toilet seat up and farted whenever he wanted.


                      THE END

                      Comment

                      • #12
                        Re: Newly restored yezdi engine seizure and sound

                        Originally posted by bharatheshk View Post
                        There is the Yezdi riders club in Mangalore, some of them members on xbhp who might help you with your problem.
                        Yeah I know. I think I'll be moving to Bangalore soon. So best done where I restored it right. That's why I'm waiting.

                        Sent from my HTC Explorer A310e using xBhp Connect mobile app

                        Comment

                        • #13
                          Re: Newly restored yezdi engine seizure and sound

                          Originally posted by B7ACKTHORN View Post
                          Overheating is precursor for seizure, and indeed falls in that category. 50ML is not a bad ML limit, but for spirited riding, I'd personally recommend 60 ML if you do....

                          Cheers!
                          VJ

                          Yeah sure will do that as soon as possible. So do you say there won't be any damage to the engine if I run it without overheating it? And which oil would you recommended? I'm thinking of shell 2T. And I read an interesting article on engine seizure. As you said usually the piston to cylinder clearance is the culprit it says. May be there is no enough clearance to facilitate that amount of thermal expansion of piston. And it says these occasional stalling is called "scoring". And thanks a lot for letting me know the difference and your valuable suggestions. Appreciate it.

                          Comment

                          • #14
                            Re: Newly restored yezdi engine seizure and sound

                            there could be one more reason - check your timing (points & condensor) advance or retard timing . You never know

                            Comment

                            • #15
                              Re: Newly restored yezdi engine seizure and sound

                              Originally posted by Crankrd View Post
                              there could be one more reason - check your timing (points & condensor) advance or retard timing . You never know
                              Oh okay. Will do that too. And could you please tell how is the points related to interference of the metal surfaces? I'm curious.

                              Comment

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