Cracking/rattling noise from rear side cases

Discussion in 'Maxiscooter Tuning' started by Dutchnrg, Mar 12, 2022.

  1. Dutchnrg

    Dutchnrg New Member

    Messages:
    2
    Good morning,

    Recently I've completely overhauled a Piaggio 125cc Hecagon engine. All the bearings are replaced, I've replacee the 125cc gears for hexagon 150cc gears.

    New malossi clutch
    New malossi variator
    New original oil pump
    New 172cc gilardoni cilinder
    New bgm crankshaft and bearings
    New bearings in end gears
    New bearings in the rear pulleys
    New DDL tuning exhaust
    New rear wheel bearing

    Last week I was on the dyno and it runs really good with no problems. The engine performs like there is nothing wrong with it. It produces 22,5HP at 9100 rpm.
    The only problem with full throttle you can hear a rattling/cracking sound from the rear of the engine cases. The tuner never hears this sound before and before the day was over we did not figured out what makes this noise.

    When i got home I openden the gears but i didn't see anything wrong. Oil was nice and clean witt no debries in it. I replaced the bearings in the rear pulley but you still hear the sound.
    I'm worried to break something if i keep on driving with the sound.
    Only with full throttle you hear the noise, with half throttle everything is fine.
    Anyone got an idea what the problem might be?

    Sorry for my English, I come from The Netherlands.
     
  2. Stevep

    Stevep Well-Known Member

    Messages:
    5,895
    There are two needle bearings in the clutch pulley halves, front and rear. I have known the front one to fail before
     
  3. MARSH

    MARSH Whooooo!

    Messages:
    3,200
    Rides:
    Piaggio Typhoon
    I would of thought you'd get the noise at any speed ? Is it "pinking" does it need a bigger main jet ?
     

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