making rattling noise over 24mph

Discussion in 'Motorized Bicycle General Discussion' started by will 3501, Jul 3, 2009.

  1. will 3501

    will 3501 New Member

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    I have a Grubee star fire 48cc with 200 miles on it There's alot of vibration noises between 22mph
    and 30 mph but at 28mph between 32mph it smoothed out A distinct rattling at 24mph between 28mph Maybe im pushing the engine to hard but it seems like it wants to go faster and i dont think ive maxed the rpm s I like to ride about 20 to 22mph im always looking out for the boyz though passed by a few{cops} here in phoenix and they just waved at me. the one distinct rattling noise is definetly coming from engine area cause i let off the gas and it stops should i be concerned with this i havent lubed or greased the gearing except put a dab of grease on the clutch end when installed . ty Chill Will AZ
     
  2. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Sounds like typical piston slap.
    Sometimes....the motor mounts will loosen and it sounds like detonation. Check those.
     
  3. Cabinfever1977

    Cabinfever1977 New Member

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    check your nuts they might be loose. rubber between your mounts and frame might help with vibration.
     
    #3 Cabinfever1977, Jul 3, 2009
    Last edited: Jul 3, 2009
  4. marioaz

    marioaz New Member

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    One thing I've learned is that any rattle on the bike will sound like it's coming from the motor. Just saying.........
     
  5. Junster

    Junster New Member

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    Mine does the exact same thing. It's the big clutch gear. Take off the right side clutch cover and put some (not alot) grease on the gear teeth. I use moly/graphite grease. I have readjusted the clutch several times and nothing stopped it. The greasing helps but I have about 1000 miles on my bike now and it's still there. If anyone has a real solution to this I'd really like to hear it. Is there any end play adjustment in the clutch shaft?
     

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