Whistling when decelerating? (in gear) - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
VN750 General Discussion

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 18 (permalink) Old 04-28-2009, 06:39 PM Thread Starter
 
Join Date: Apr 2009
Posts: 7
iTrader: (0)
 
Whistling when decelerating? (in gear)

He, i've noticed a moderately high pitched whistling noise when I'm engine braking. The noise starts at a higher pitch, then drops to a lower pitch as the bike slows down. The sound only happens wehn I'm in gear... if I slow down with the clutch lever pulled, the sound is gone. Any ideas?
dubious is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 04-28-2009, 07:38 PM
Calif Rider
 
weh44att's Avatar
 
Join Date: Jan 2006
Location: Petaluma Calif
Posts: 725
iTrader: (0)
 
You can try with help to hold the bike. Put the bike up on the center stand, warm it up, put in gear eccelerate the engine. Stand close to it and try and hear where the whisle is coming from. Maybe then with where the sound is coming from somebody maybe able to help with a solution. I my self have not heard a sound like that on my bike at all.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
weh44att is offline  
post #3 of 18 (permalink) Old 04-28-2009, 08:08 PM
Senior Member
 
letitflight's Avatar
 
Join Date: Mar 2006
Posts: 668
iTrader: (0)
 
i had the same whistling too. and i think it's coming from the 'ears'(air filter).
sometime mine gets very noticeable during decelaration.

my 2 cents

PEACE!!!

2005 Vulcan 750
letitflight is offline  
 
post #4 of 18 (permalink) Old 04-28-2009, 08:23 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,671
iTrader: (4)
     
Garage
Vulcans whistle when they are happy.

When was the last time you changed your oil and what did you use?
(clutches tend to wine, not whistle however)

Could be your helmet.


KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker is offline  
post #5 of 18 (permalink) Old 04-28-2009, 08:24 PM Thread Starter
 
Join Date: Apr 2009
Posts: 7
iTrader: (0)
 
Quote:
Originally Posted by Knifemaker View Post
Vulcans whistle when they are happy.

Could be your helmet.


KM
Its not my helmet, because when I pull the clutch lever, the sound goes away. And it almost DOES sound happy! I took a girl on the bike and she thought it was cute sounding.
dubious is offline  
post #6 of 18 (permalink) Old 04-28-2009, 08:40 PM
Giggity!
 
kanuck69's Avatar
 
Join Date: Jun 2007
Location: Ohio, Zanesville
Posts: 4,307
iTrader: (24)
     
Garage
Quote:
Originally Posted by dubious View Post
Its not my helmet, because when I pull the clutch lever, the sound goes away. And it almost DOES sound happy! I took a girl on the bike and she thought it was cute sounding.
If girls like it... KEEP IT!
kanuck69 is offline  
post #7 of 18 (permalink) Old 04-28-2009, 08:50 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by dubious View Post
Its not my helmet, because when I pull the clutch lever, the sound goes away. And it almost DOES sound happy! I took a girl on the bike and she thought it was cute sounding.
Sounds like a clutch basket or output shaft bearing, or possibly bevel gear or final drive noise.

Check the final drive oil level.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote

Last edited by lance328; 04-28-2009 at 08:54 PM.
lance328 is offline  
post #8 of 18 (permalink) Old 04-28-2009, 11:24 PM
Senior Member
 
letitflight's Avatar
 
Join Date: Mar 2006
Posts: 668
iTrader: (0)
 
try this: remove the ears(cover and filter only) and start your bike with the center stand, and let us know if it's still doing it, i bet you won't hear it anymore.
you can hear the whistle 'big time' when you use a video camera or just by recording it with a cheap recorder.
it sounds like when someone takes a hit from a bong (water pipe) but at a faster rate and higher pitch

cheers

PEACE!!!

2005 Vulcan 750
letitflight is offline  
post #9 of 18 (permalink) Old 04-29-2009, 05:27 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,671
iTrader: (4)
     
Garage
Quote:
Originally Posted by letitflight View Post
.....it sounds like when someone takes a hit from a bong (water pipe) but at a faster rate and higher pitch
Yah, there's a sound everyone is familar with.....LOL


You all came up with some pretty intresting diagnosis on this one. But as it seems to happen when downshifting/engine breaking I would bet a buck it is one of the reed valves.

Try "marbling" and see if it goes away.

(Marbling comes with the practice of sticking a marble in the hoses going to the reed valves to block them off)




KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker is offline  
post #10 of 18 (permalink) Old 04-29-2009, 05:56 PM
The Reanimater
 
jthill524's Avatar
 
Join Date: Apr 2009
Location: A Little Town Along I-5 in Northern California
Posts: 847
iTrader: (2)
 
OK.... It can't be a vacuum leak because they stay Constance. Since it changes with speed and goes away when you dis-engage the clutch. I'd have to say the noise is more a rubbing noise, like rubbing your finger around a wine glass.

Now the rear end, shaft, transmission and engine is still turning when you pull the clutch handle.

The answer could be one or more warped clutch plates.


Quote:
Originally Posted by dubious View Post
He, i've noticed a moderately high pitched whistling noise when I'm engine braking. The noise starts at a higher pitch, then drops to a lower pitch as the bike slows down. The sound only happens wehn I'm in gear... if I slow down with the clutch lever pulled, the sound is gone. Any ideas?

JaY



"Veronica"
2002 VN750 Vulcan
Rebuilt Engine
ACCTs lubed w/TOC Springs
Pick-up Coils Gapped at .018"
Splines Lubed
Deka MF AGM EXT15L Battery
NGK Iridium IX Spark Plugs
R/R Relocation Fix
New Rear Rack
Stock Seat Repadded
Ext-BackRest
jthill524 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome