backfire - 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 5 (permalink) Old 05-27-2007, 05:22 PM Thread Starter
Junior Member
 
Join Date: May 2007
Location: corby, northamptonshire, england.
Posts: 11
iTrader: (0)
 
Send a message via AIM to b cameron
backfire

hi guys,
still got a problem with my VN750.
front cylinder not working. cleaned carbs, new battery, plugs, leads and caps.
just marbled it (no emissions over here), no exhaust leaks, plenty of compression.
but!..........lots of suction on rear carb, practically none on front(hand over open carb)
runs on two for a few seconds intermitently. starts straight away.
bike has been standing for two years, but ran fine till then. shortened exhaust by removing that big lump in the middle.
any ideas?
b cameron is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 05-27-2007, 09:55 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
If you have no suction on the front cylender but you have compression then I would check the cam chain.
If the intake valves are not opening you wont get any suction but can have compression. You may have had the chain jump causing to be way out of time. But then you would not have good compression.
Do you have access to a borascope?
They are great to have to help find valve problems.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
post #3 of 5 (permalink) Old 05-28-2007, 12:35 PM Thread Starter
Junior Member
 
Join Date: May 2007
Location: corby, northamptonshire, england.
Posts: 11
iTrader: (0)
 
Send a message via AIM to b cameron
what is a borascope?
if the timing is out,how can i check. bike only has 8k from original on it.
could the valves be sticking.
every now and then it ticks over perfectly for a few seconds. wondering if the coil may be breaking down under load, or a fuel problem.
what do you think guys?
b cameron is offline  
 
post #4 of 5 (permalink) Old 05-28-2007, 12:45 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
Borascope is a tool that allows you to look into the cylender throught the sparkplug hole. Has a light and a mirror on it, kinda like a small parascopeon a sub.
I have one at work, I am a mechanic though.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
post #5 of 5 (permalink) Old 05-28-2007, 01:40 PM Thread Starter
Junior Member
 
Join Date: May 2007
Location: corby, northamptonshire, england.
Posts: 11
iTrader: (0)
 
Send a message via AIM to b cameron
Smile

ok, i will see if i can get hold of one.
cheers

Bambi
b cameron 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