Abnormal drive train noise

1. Clutch noise
   

• Weak or damage damper.
  

  
  

• Clutch housing/friction plate clearance excessive.
  

  
  

• Clutch housing gear worm.
  

  
  

   

1. Transmission noise
   

• Bearing worn.
  

  
  

• Transmission gears worn out.
  

  
  

• Transmission gears chipped.
  

   

  
  

• Engine oil insufficient.
  

  
  

• Metal chips jammed in gear teeth.
  

  
  

   

1. Drive chain noise
   

• Drive chain adjusted improperly.
  

  
  

• Chain worm.
  

  
  

• Rear wheel misaligned.
  

  
  

• Insufficient chain lubrication.
  

  
  

• Rear and engine sprocket worn.