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Shogun - Engine noise at constant RPM

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  • #1

    Shogun - Engine noise at constant RPM

    Hi all,

    I have recently restored my Shogun (2000 model with cat-con) with a new bore/piston kit. Need your help in diagnosing an engine noise while riding my Shogun at constant RPM of >4000. At lower RPM/lower speeds it is not that significant but still it is present. This engine noise is something like a "metallic clang-clang" noise heard only when the engine is warm/hot and while holding the throttle at a constant RPM. Also, the noise is heard when releasing the throttle from a high RPM/speed.
    I was facing this problem with my old bore/piston also, and my mechanic said once we go in for a new bore/piston it will be solved. Initially there was no noise with the new bore/piston kit, but now (after 1200 km) it is more pronounced and kind of irritating

    Any help in this regard would be helpful

    Regards,
    Suresh
    Last edited by Autopub; 11-20-2009, 12:55 PM.
    Tags: None
  • #2
    Query Approved.
    :)

    Comment

    • #3
      are you loosing power when you hear the noise?

      if not, its just piston slap. that happens when the clearance between the piston and liner is too much. as long as its not too much, the noise is harmless. get the clearance checked by someone with a micrometer and a bore gauge. too much slap can crack the piston. but as you have rebored recently, your bore will be more or less circular and you dont need to worry about that.

      If you are loosing power, you are detonating. check for air leaks in the intake and fuel quality.

      its actually hard to tell whats happening without riding the bike.
      Abhishek

      Comment

      • #4
        Hi Abhishek,

        There is no power loss at all when the noise is heard. Also, can this piston slap occur in a new bore/piston (not re-bored) that too within 1200km run-in period? What do I need to tell the mechanic to rectify this?

        Suresh

        Comment

        • #5
          yes, the piston slap can be heard within 1200kms of a rebore but that means the rebore was a bad one.

          i recommend you change your mechanic or boring shop.

          but above anything, i recommend you to live with it for the next 20000kms. the rebore after that will rectify the issue.

          your piston slap does not seem to be anything more than a minor irritation, so let it go.
          because if you go back to the mech, any mech and tell him to reduce the slap, they will most probably give you a very tight bore. and you will just end up seizing on a hot humid day.

          i am having a lot of piston slap on my rd and its still going great.
          so its a non-issue really.
          Abhishek

          Comment

          • #6
            sorry did not read the part about the NEW bore and piston.

            a slap in a out of the box barrel is usually unlikely. the guys in the factory usually have better manufacturing tolerances.

            just ride it man... i consider a bit of slap good as i am assured the bike will not seize up on me.
            Abhishek

            Comment

            • #7
              Hi Abhishek,

              The plus point of the engine not seizing is good , but the irritating slap noise completely "kills" the melody of the shogun at 60-70 kmph speed

              I purchased the cylinder/bore piston kit along with the rings from Zen motors, Bangalore. So if there is "gap" between the bore and piston, does that mean that they have given bore and piston of different sizes ?

              Suresh
              Last edited by Autopub; 11-25-2009, 03:50 PM.

              Comment

              • #8
                i think it is just the crank play
                it is common among 2 strokes n more pronounced in suzuki's
                do u use pre mix or oil pump ??
                may be u are running lean

                Comment

                • #9
                  Originally posted by nikhils View Post
                  i think it is just the crank play
                  it is common among 2 strokes n more pronounced in suzuki's
                  do u use pre mix or oil pump ??
                  may be u are running lean
                  How do you find out if it is crankplay or slap noise? Also, is there any solution if it is crankplay?

                  I am using oil pump (new pump) and every 20 days/500 km I am topping it up with 1/2 litre 2T oil.

                  Aahh , yes you are right, I think this is the culprit! I remember the TVS guy saying that he has tuned it for mileage, and my gun is stretching a litre to 38-39 km ! But how is this related to the noise?

                  -Suresh

                  Comment

                  • #10
                    piston slap noise is usually at the start of ur engine and gets reduced as it warms up whereas crank play is usually present throughout n more when u release the throttle at slower speeds
                    your crank gets lubed with the 2t oil u put in
                    since u r using pump its fine n make sure the cable to the pump is tight n there isnt ne lag
                    try a richer setting

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