Petcock making high pitched noise in "on" reserve" - diaphram failure? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 5Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 04-11-2016, 09:56 PM Thread Starter
Senior Member
 
Join Date: Mar 2016
Location: MI
Posts: 292
iTrader: (0)
 
Petcock making high pitched noise in "on" reserve" - diaphram failure?

In "on" it whine till I cover the outlets with a finger. in "off" its silent. failure coming?

I tested my 2002 petcock valve a few nights ago (it was ok) and then realized I did two stupid things. 1) I used more vacuum than the engine might make with hand pump 2) I left straight seafoam in the tank.

Today I noticed a high pitch whine, picked up tank and... it leak just a little bit. I am thinking the that something is failing in that valve or will fail soon if that makes sense.

If you were me would just put a new tw200 on?

2002 vn750
AGM battery, Shinko 230 tires oversized front
Ear shaved - k&n pods, drilled clutch basket
MCCT
40/138 jetting

If I can split a case and make it work - you can too!
Forum pictures:http://s150.photobucket.com/user/Gid...?sort=3&page=1

Last edited by gidaeon; 04-11-2016 at 10:44 PM.
gidaeon is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 04-11-2016, 11:29 PM
Senior Member
 
RoadHopper's Avatar
 
Join Date: Oct 2015
Location: Los Angeles - Central
Posts: 570
iTrader: (0)
 
Garage
Quote:
Originally Posted by gidaeon View Post
If you were me would just put a new tw200 on?
I'd do that just to compare the two since the tw200 is cheap. Worst that could happen is you end up with a spare petcock.



Is it worth that pricetag/work to answer your question?
RoadHopper is offline  
post #3 of 12 (permalink) Old 04-11-2016, 11:41 PM Thread Starter
Senior Member
 
Join Date: Mar 2016
Location: MI
Posts: 292
iTrader: (0)
 
Well said!

The thing is I don't know if a failing diaphram could prevent successfullfeeding. I try not to buy un-needed parts - but I hear ya.

I do understand I could put it "off" to prevent flooding since that function is not vaccum\diaphram related just like the tws200.

2002 vn750
AGM battery, Shinko 230 tires oversized front
Ear shaved - k&n pods, drilled clutch basket
MCCT
40/138 jetting

If I can split a case and make it work - you can too!
Forum pictures:http://s150.photobucket.com/user/Gid...?sort=3&page=1
gidaeon is offline  
 
post #4 of 12 (permalink) Old 04-12-2016, 01:07 AM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
A whining from the petcock? Its known to clack when the spring gets weak, but not whine. That's odd.

I personally prefer the OEM petcock over the tw200 design. Easy enough to rebuild yours.
jonlandrum likes this.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
thtanner is offline  
post #5 of 12 (permalink) Old 04-12-2016, 12:30 PM
Senior Member
 
kc2dgq's Avatar
 
Join Date: May 2010
Location: New Jersey
Posts: 3,353
iTrader: (13)
 
Garage
Quote:
Originally Posted by thtanner View Post
A whining from the petcock? Its known to clack when the spring gets weak, but not whine. That's odd.

I personally prefer the OEM petcock over the tw200 design. Easy enough to rebuild yours.
I agree with Tanner....a whining petcock sounds like a bad diaphragm or a straight up leak from vacuum port to fuel ports.
Rebuild it and keep the original.

FYI: I now have a modified tank with a Pingel petcock that is gravity fed....I lost the safety feature of the stock petcock to prevent fuel flow if the carb float sticks open......and it makes me nervous since I have gotten into the habit of never turning my fuel petcock off.

I imagine walking into my shed one day and finding a huge puddle of fuel on the ground....not to mention a leaky float could fill up your crankcase with fuel.
kc2dgq is offline  
post #6 of 12 (permalink) Old 04-12-2016, 12:46 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,786
iTrader: (4)
     
Garage
If you used too much vacuum on the petcock, you could have ruptured the diaphragm...that might make it squeal.

So yes, replace or rebuild it.
WilliamTech likes this.

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker is online now  
post #7 of 12 (permalink) Old 04-12-2016, 12:56 PM
..have a vulcan good day!
 
WilliamTech's Avatar
 
Join Date: May 2011
Location: Pensacola, FL.
Posts: 4,508
iTrader: (17)
   
Quote:
Originally Posted by Knifemaker View Post
If you used too much vacuum on the petcock, you could have ruptured the diaphragm...that might make it squeal.

So yes, replace or rebuild it.
Yes, but I think this from post #1 is the culprit....

Quote:
Originally Posted by gidaeon View Post
In "on" it whine till I cover the outlets with a finger. in "off" its silent. failure coming?

I tested my 2002 petcock valve a few nights ago (it was ok) and then realized I did two stupid things. 1) I used more vacuum than the engine might make with hand pump 2) I left straight seafoam in the tank.

Today I noticed a high pitch whine, picked up tank and... it leak just a little bit. I am thinking the that something is failing in that valve or will fail soon if that makes sense.

If you were me would just put a new tw200 on?


(Petcock) rubber does not perform well soaked in Seafoam......

EDIT: I stand corrected in above knowledgible members....sorry

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 04-12-2016 at 06:19 PM.
WilliamTech is offline  
post #8 of 12 (permalink) Old 04-12-2016, 03:05 PM
Senior Member
 
kc2dgq's Avatar
 
Join Date: May 2010
Location: New Jersey
Posts: 3,353
iTrader: (13)
 
Garage
I don't recall Seafoam ever doing any damage to rubber.

Carb cleaner will eat up rubber, but I don't think Seafoam would do much harm. If anything, it would condition and swell the seals and rubber a bit and actually make a better seal...no?
kc2dgq is offline  
post #9 of 12 (permalink) Old 04-12-2016, 04:53 PM
..have a vulcan good day!
 
WilliamTech's Avatar
 
Join Date: May 2011
Location: Pensacola, FL.
Posts: 4,508
iTrader: (17)
   
Quote:
Originally Posted by kc2dgq View Post
I don't recall Seafoam ever doing any damage to rubber.

Carb cleaner will eat up rubber, but I don't think Seafoam would do much harm. If anything, it would condition and swell the seals and rubber a bit and actually make a better seal...no?
Really , well thankful for setting me straight......I trust your knowledge....I thought it was harmful in the carbs seals...(in time soaking).
TY for the education....
Good info....thanks again

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 04-12-2016 at 05:02 PM.
WilliamTech is offline  
post #10 of 12 (permalink) Old 04-12-2016, 04:57 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,786
iTrader: (4)
     
Garage
^ what he said. Never seen a problem with Seafoam and rubber (or synthetic rubber)

I put a rubber O ring, a nylon washer, and some red gasket material in a jar with Seafoam in it. Let it sit a week. Nothing happened.
WilliamTech and thtanner like this.

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker is online now  
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