Still having carb problems - 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 8 (permalink) Old 11-01-2012, 06:01 PM Thread Starter
Banned
 
Join Date: Jul 2012
Posts: 54
iTrader: (0)
 
Still having carb problems

I am totally baffled here. To begin with, I thought I had clogged jets. Idle was erratic, lots of misfiring, and it would often start on one cylinder. I used a lot of Seafoam in the gas, soaked the carbs (on the bike) in Seafoam, and after riding it several hundred miles, it idled just fine. So I thought, ok, the jets are cleaned out. But it doesn't last. Several times after that, the symptoms would reappear after letting it sit for just a few days. If started and ridden every day it would be fine. Since it can't run fine if the jets are plugged, I'm assuming they are not. Can they really get plugged up after sitting for just a few days, even with Seafoam in the gas? Or is there something else going on here? Carb and gas tank venting are fine. It acts exactly like the jets are partly plugged up, until ridden for a while. I'm getting ready to throw in the towel and buy a Honda.
suitcasejefferson is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 11-01-2012, 06:43 PM
Senior Member
 
Join Date: Aug 2010
Location: Daleville, Alabama
Posts: 445
iTrader: (0)
 
Got any air leaks around the carb boots? And what are the air mixture screws set to? 2 1/2 or so??? I ride mine most every day but since it's cooled off in the morning my idle and low rpm ( <2000 ) is rough. Once I get her hot she's fine. But I do have a fuel seep somewhere on the front carb. One day I'll take them off and try to find it.

MCCT Mod
Pickup Mod
12 Volt Receptacle Mod
Memphis Shades Santa Cruz
Homemade Luggage Rack
NGK Iridium IX Spark Plugs
Harley Sportster Exhausts
Rotating/Flashing Tail Lights
170/80 Michelin Commander II
Saddlemen Highwayman Slant Jumbo Saddlebags
Bought 09/10 12.2k miles - 04/12 33.4k miles
CW-4 is offline  
post #3 of 8 (permalink) Old 11-02-2012, 07:28 AM
Giggity!
 
kanuck69's Avatar
 
Join Date: Jun 2007
Location: Ohio, Zanesville
Posts: 4,307
iTrader: (24)
     
Garage
Have you taken the jets out yet & inspected them?
Someone chime in here but I was under the assumption that jets clogged as the engine ran allowing deposits of gunk to collect as the fuel runs thru it, not as the bike sits.

Also, have you removed the fuel petcpck to inspect the screens? You could have sediment collected from the tank building on them or they may have a rip.

As noted above a vacuums leak is also a possible culprit.
It the vent hose going to the right air filter is butted right up against the housing, it can cause odd running conditions.
kanuck69 is offline  
 
post #4 of 8 (permalink) Old 11-02-2012, 10:32 AM
Jack of all trades
 
M_Angell's Avatar
 
Join Date: Jul 2009
Location: Westland, Michigan
Posts: 2,863
iTrader: (11)
 
Is there a strong gas smell? Maybe a stuck float? Is your petcock left on? Check all of these things first, they seem pretty simple but they can all cause some similar problems by flooding out your engine prior to startup.
M_Angell is offline  
post #5 of 8 (permalink) Old 11-02-2012, 12:37 PM
Senior Member
 
Join Date: Mar 2012
Posts: 450
iTrader: (0)
 
Garage
First off seafoam is garbage!

You need to clean the carbs properly. Remove the carbs from the bike and take them completely apart and clean them with carb cleaner, it's the only way! There can easily be sand or other debris in the bowls or elsewhere and they fall in and out of the jets or other places causing problems.
Rebel13 is offline  
post #6 of 8 (permalink) Old 11-02-2012, 10:27 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,888
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
Quote:
Originally Posted by M_Angell View Post
Is there a strong gas smell? Maybe a stuck float? Is your petcock left on? Check all of these things first, they seem pretty simple but they can all cause some similar problems by flooding out your engine prior to startup.
sounds like a stuck float to me

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #7 of 8 (permalink) Old 11-05-2012, 02:07 PM
Member
 
Byorec's Avatar
 
Join Date: May 2011
Location: Jarrell, TX
Posts: 54
iTrader: (0)
 
I wanted to clean my carbs, and came across this website:

http://cycles.evanfell.com/2008/09/h...the-right-way/

I pulled the diaphrams out, and put the entire carb assembly and the diaphrams (minus the needle spring & shims) in the boiling lemon juice. I cleaned the bowls and caps with carb cleaner. After reassembly, the bike ran better, and my RPMs actually decreased about 200 - 250 @ 80 mph.

Byorec

2000 VN750
Over 37,000 miles
Battery-Minder Plus
Maintenance Free Battery
MCCT
Ride-On
Upsized Metzeler ME880 Tires
Ear Shave
V&H Cruzers Exhaust
Mutazu Saddle Bags
F&S Saddlebag bracket
F&S Luggage Rack
Byorec is offline  
post #8 of 8 (permalink) Old 11-06-2012, 01:18 AM
Senior Member
 
Join Date: Jul 2012
Posts: 384
iTrader: (-3)
 
That was a neat read. I will have to try that with my buddies carbs. They are an absolute mess and I will use the boiling lemon juice and see how well it works. Thanks for sharing the link.
TSmith68 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