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Another Sound... After riding and shutting off

  #1  
Old 04-19-2011, 09:28 PM
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Default Another Sound... After riding and shutting off

So I go riding and shut the bike off. It makes a sound between a hum and squeal. Like a valve almost closing... Highly doubt it's anything serious but thought i would ask.
 
  #2  
Old 04-20-2011, 08:10 AM
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Real quiet humming? Gas tank vent probably
 
  #3  
Old 04-20-2011, 10:28 AM
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Did you or the previous owner remove the pair valve? It's a common mod (clean air mod) that increases crank vacuum. That humm is air sucking back into the crank to equalize with outside pressure. (it's normal after the mod)
 

Last edited by Sick97SS; 04-20-2011 at 11:09 AM.
  #4  
Old 04-20-2011, 11:05 AM
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I noticed that too after I did my clean air mod. I guess I never paid attention before.
 
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