"chirp" noise on shut down?

[choseneasy]

Got a bike that gives a little chirp thru the air cleaner on shut-down. Sounds like air escaping thru the throttle plate(delphi inj) Anybody else experience this? Bike has new cams, umbrella valves lifters etc. Did it before and after (had a bad inner cam bearing). Thanks in advance.

[hrdtail78]

My 06 does it.  I think it's the IAC.  Been doing it for a couple of years.  I dont worry about it.

[bigfoot5x]

My wife's bike does the same thing on a fairly regular basis and is 3 years old now. It is stock except for air cleaner and mufflers. Mine does it occasionally. My bike is an 07 also but is now a 103 with 10:1 compression and an Andrews cam. We've never had any problem associated with the noise.

[Rags722]

Find something new to worry about. It's perfectly normal during shutdown on a Delphi system

[truck]

It happened on my MM system from time to time also.

[dakota224]

Yep , They all do that ..   

[harleyjt]

Mine does it too. Kind of a sneeze.  Normal. 
jt

[rbabos]

It's just air blowing past the throttle plate when the piston doesn't quite get over the hump and rebounds back on a shutdown. Sometimes you can even see vapour floating up from the breather after the sqeak sound.
Ron

[Jeffd]

carbs do it too lol. 

[Mix01FLHT]

Hell, my ex wife even did it.....   

But I solved that problem....

[FLTRI]

From my experience most all the time it is from the rubber vent flaps in the rocker boxes that get a bit hard over time and act kinda like a reed instrument when the engine shuts down the crankcase relieves itself making a whistle sound.
Bob

[choseneasy]

Sorry, been away. I used to think it was always the umbrella's but I had just changed them. It is thru the throttle plate--I was wondering if a bent throttle shaft or a plate that was closing in the bore too much. Thanks for the replies.
  P.S. I knew a shop that chased a chirp on a sportster years ago-- they did settle on the umbrella's.