Forums 🚥 PIT STOP 🔧 Hyosung Technical Help Strange noise from rear cylinder

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    • #4671
      Mark lindsay
      Member
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      @sparky
      Belfast
      Gt125r

      I have a noise from rear cylinder sounds like a scraping or grinding noise I have replaced cam chain tensioner and noise still ther noise gets louder at idle wen open throttle I have a hole in exhaust near cat converter and downpipe near rear cylinder could that affect this sound I will post a video of bike running soon

    • #4676
      ♠️ MARCEL
      Administrator
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      @mf448kxn6
      North UK
      GTR

      Did you manage to get a video?

      If you hear metal scratching sounds going up and down rapidly near the valve head/cylinder barrel.  Thats the piston rings

      Is that what youre hearing?

      // Meditation doesn't mean you have to sit still....

    • #4891
      Mark lindsay
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      @sparky
      Belfast
      Gt125r

      so new piston and rings then should solve the problem then?

    • #4892
      Mark lindsay
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      @sparky
      Belfast
      Gt125r

      so new piston and rings then should solve the problem then? Also there is smoke coming from the rocker cover when engine running

    • #4899
      ♠️ MARCEL
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      @mf448kxn6
      North UK
      GTR

      so new piston and rings then should solve the problem then? Also there is smoke coming from the rocker cover when engine running

      Have you taken apart the motor or has the mechanic looked at it?

      What kind of smoke? from where? is the cover loose? is there a spillage of oil? A bit more info helps.

       

      // Meditation doesn't mean you have to sit still....

    • #4901
      Mark lindsay
      Member
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      @sparky
      Belfast
      Gt125r

      Smoke from the rear cylinder smells like oil and sound of scraping metal on metal

    • #4903
      ♠️ MARCEL
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      @mf448kxn6
      North UK
      GTR

      It means time to change:

      • Barrel , Piston with Rings , Tensioner

      And likely also:

      • Check valves aint bent.
      • Cam chain isnt worn down or replace it ideally
      • Change tappet numbers (WHEN you do timings and clearances , *must be done* )

      As with new parts, run it in for few hundred miles.

      // Meditation doesn't mean you have to sit still....

    • #4909
      Mark lindsay
      Member
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      @sparky
      Belfast
      Gt125r

      Do you know torque settings for the bolts of the cylinder?

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