Hesitation from idle - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 04-26-2009, 11:32 PM Thread Starter
Junior Member
 
SLamo's Avatar
 
Join Date: Sep 2008
Posts: 17
iTrader: (0)
 
Hesitation from idle

My '86 has been running like a top until today. When I trist the throtle from idle i get a hesitation and back firing from the exhaust and (it sounds like) from the carb. I run seafoam through it with every tank full and I rebuilt the carbs last year. I've put 500 miles on it since the carb rebuild and this is the first time I/ve had a problem. It idles great and I have no problem with power when I'm riding it. I was going to marble it but I want to address this problem before I change anything. I did notice that the hoses that recieve the marbles are cracked at the reed valve. Could this have anything to do with my problem? I haven't drilled out my mixing screws yet. On another note, do I need to adjust my valves? I'm starting to hear a light ticking sound while riding.
SLamo is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 04-27-2009, 03:23 AM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by SLamo View Post
My '86 has been running like a top until today. When I trist the throtle from idle i get a hesitation and back firing from the exhaust and (it sounds like) from the carb. I run seafoam through it with every tank full and I rebuilt the carbs last year. I've put 500 miles on it since the carb rebuild and this is the first time I/ve had a problem. It idles great and I have no problem with power when I'm riding it. I was going to marble it but I want to address this problem before I change anything. I did notice that the hoses that recieve the marbles are cracked at the reed valve. Could this have anything to do with my problem? I haven't drilled out my mixing screws yet. On another note, do I need to adjust my valves? I'm starting to hear a light ticking sound while riding.
Have you tried Irridium plugs, DPR7EIX-9? Your plugs could be fouled!!

Ticking noise may be your ACCT's, or you may need an oil change.


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
lance328 is offline  
post #3 of 7 (permalink) Old 04-27-2009, 03:34 AM
Simple Solutions
 
seebeeare's Avatar
 
Join Date: Jun 2008
Location: SEQUIM, WA
Posts: 965
iTrader: (3)
 
Send a message via MSN to seebeeare Send a message via Yahoo to seebeeare
valves the lifter are hydrolic and are not adjustable wouldn't need to be bled unless ran out of oil... look up grambos trick for your acct ....
you mixture screws shouldnt need adjusting unless u have changed the air box.... try a lil seafoam in the gas... check for leaks in the manifold... if your hose is cracked for the read valves how are the vac hoses one to the diafram that controlls the reed valve and the other to the petcock ? are they in good shape or do u think there may be a vac leak... i lik the propane test for the vac leak ... just get a tourch (not lit ) and chase the hoses with propane also check the maniforld boots too



Stator #3
MF AGM
DeGoated
Ears Shaved
R/R relocated
Rebuilt



She's worth her weight in GOLD
If u dont have it already Here is the Service Manual
How To Test the Stator

Last edited by seebeeare; 04-27-2009 at 03:40 AM.
seebeeare is offline  
 
post #4 of 7 (permalink) Old 04-27-2009, 09:32 AM
Senior Member
 
dragonrider's Avatar
 
Join Date: Feb 2009
Location: chesterfield ,Mi
Posts: 363
iTrader: (0)
 
propane works good to find a leak , it will make it idls a little faster when yuo find a leak . becarefull tho , i was checking a car for leaks once with propane and found more than a leak. what i found was a bad plug wire i didnt know about . imagen my suprise whe the hose that i hooked up to the propane bottle ignighted. it sure was a pretty blue flame. use wd foryt or carb cleaner. its a little less flamable.

good luck

DRAGONRIDER
RIDE LONG AND RIDE SAFE
dragonrider is offline  
post #5 of 7 (permalink) Old 04-27-2009, 11:07 AM
On His Lady Vulcan
 
wkrizan's Avatar
 
Join Date: Apr 2008
Location: Washington State
Posts: 1,647
iTrader: (10)
 
As stated prior to this post, check manifold boots for cracks, check for vacuum leaks, and a you might wanna check that your carbs arent out of sync. I was having a very simular issue as you are just last week (popping at idle and carb backfireing). So I built a man-o-meter and re synced my carbs and no more issues. Good luck and keep us informed on your progress.


Peace

"You came out of your mom looking like SHlT. She thought you were beautiful. Don't know what scared me most, your looks or her judgment."











Pictures of the "Ladies"
wkrizan is offline  
post #6 of 7 (permalink) Old 04-27-2009, 10:11 PM Thread Starter
Junior Member
 
SLamo's Avatar
 
Join Date: Sep 2008
Posts: 17
iTrader: (0)
 
I shouldn't need an oil change yet, 500 miles on Rotella synth. I think I may need to work on my auto tentioner. I probably do need to sync my carbs. I didn't do it after the rebuild because is was running so well. I saw that Crobins365 posted to set the idle at 1100 when doing a sync. Is this what idle should be at all the time 'cause my idle is at 800 rpm.
SLamo is offline  
post #7 of 7 (permalink) Old 04-27-2009, 10:41 PM
On His Lady Vulcan
 
wkrizan's Avatar
 
Join Date: Apr 2008
Location: Washington State
Posts: 1,647
iTrader: (10)
 
Idle should be at 1100 yes, 800 is to low for our bike.

"You came out of your mom looking like SHlT. She thought you were beautiful. Don't know what scared me most, your looks or her judgment."











Pictures of the "Ladies"
wkrizan 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