Carb sync or something else? - 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 6 (permalink) Old 03-26-2010, 12:14 PM Thread Starter
Member
 
Mushu's Avatar
 
Join Date: Mar 2006
Location: Mexico City
Posts: 90
iTrader: (0)
 
Send a message via MSN to Mushu
Carb sync or something else?

Recently got my shifter fixed and also got the piston rings replaced. Before the engine split it was smooth as glass very little vibration. After the rebuilt, there is a lot more vibration (fairly constant and no grinding noises). As per other posts here in the forum I checked the oil level and found it a somewhat overfilled, so fixed that and the vibes reduced by some amount but still present. I'm thinking the ring replacement somewhat moved the vacuum of the cylinders screwing the carb sync... could this be the reason of the vibration? It's not too bad now and I donīt think it will rattle anything off but I want to get it back to been smooth. Should I try to sync the carbs?
Any input will be appreciated

Thanks

93 VN750
R/R Relocation to the front
Pirelli MT66 Tires soon to be mounted (only after 14 years...)
Mushu is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 03-26-2010, 12:39 PM
Members who have donated towards server costs
 
flitecontrol's Avatar
 
Join Date: Dec 2008
Location: Monroe, LA
Posts: 4,699
iTrader: (14)
 
Did you replace the balance dampers?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
flitecontrol is offline  
post #3 of 6 (permalink) Old 03-26-2010, 01:03 PM
On His Lady Vulcan
 
wkrizan's Avatar
 
Join Date: Apr 2008
Location: Washington State
Posts: 1,647
iTrader: (10)
 
Just as Flite said, Dampers? To also answer your original question it wouldnt hurt to check your sync.

"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 #4 of 6 (permalink) Old 03-26-2010, 05:38 PM Thread Starter
Member
 
Mushu's Avatar
 
Join Date: Mar 2006
Location: Mexico City
Posts: 90
iTrader: (0)
 
Send a message via MSN to Mushu
Yes, the balancer dampers where replaced at the time. Also something that did omited is that at idle the motor thumps (?) ever so like a harley (but so much less pronounced)... so I'll try the sync over the weekend.

93 VN750
R/R Relocation to the front
Pirelli MT66 Tires soon to be mounted (only after 14 years...)
Mushu is offline  
post #5 of 6 (permalink) Old 03-28-2010, 10:50 AM
Members who have donated towards server costs
 
93VN750's Avatar
 
Join Date: May 2006
Location: Tampa, Florida
Posts: 1,766
iTrader: (2)
 
Send a message via Skype™ to 93VN750
Did you do the work? There are loads of timing issues to be taken care of when assembling the motor, anyone of them can cause this problem.

If you did not do the work, then I would take it back to whoever did and have them fix it.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
93VN750 is offline  
post #6 of 6 (permalink) Old 03-30-2010, 11:47 AM Thread Starter
Member
 
Mushu's Avatar
 
Join Date: Mar 2006
Location: Mexico City
Posts: 90
iTrader: (0)
 
Send a message via MSN to Mushu
Must likely I'll take it back over the weekend to the shop where they worked on it.
One last thing I want to try it's that the sparkplugs they actually put DPR9EA-9 sparkplugs not the original DPR7EA-9 sparkplugs (the 9's are colder ones) so I got from them the right ones, change them last night. Engine seems a lot smoother, so I'm thinking they where misfiring heavily (the sparkplugs where sooted and they where only ridden for 100 miles or so) . Today I'll ride it some and take note on the vibration issue.

I'll keep posting to see if this fixes the problem.

Thanks for the input

93 VN750
R/R Relocation to the front
Pirelli MT66 Tires soon to be mounted (only after 14 years...)
Mushu is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Tags
carbs , engine , vibration

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