Reinstalling the ears? - 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 4 (permalink) Old 10-12-2015, 12:04 PM Thread Starter
Member
 
DR.BADNEWS's Avatar
 
Join Date: Aug 2015
Location: Virginia Beach
Posts: 53
iTrader: (0)
 
Reinstalling the ears?

I have a 2006 Kawasaki Vulcan where the previous owner replaced the exhaust, rejetted(not sure about size), and performed the ear shave mod.

While I'm sure it picks up speed like a champ, but it's impractical for me because of the excessive back firing when decelerating and the engine crankcase breathers keep falling off, all while I'm sure water is getting in the crankcase because I have to ride in all weather all year round.

I bought a replacement surge box and k&N filters fitted for the "ears" but I can't figure out how to get this thing in the frame. I'm at a total loss here how to fit this in and it looks like people cut the surge box to pull it out.
DR.BADNEWS is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 10-12-2015, 12:21 PM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
The backing on deceleration is incorrect jetting or incorrect A/F screw settings. You do not need to put on the restrictive intake (ears) to prevent that. I'd get a better crankcase breather setup, and potentially get different filters as my K&Ns do not fall off my carbs.

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 #3 of 4 (permalink) Old 10-12-2015, 12:49 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,302
iTrader: (5)
   
I had to pull the wiring harness out of the frame, from the battery forward, to get the airbox out in one piece. Once the harness is out of the way, the box will slide in/out from the rear.

The backfires are most likely from a lean idle mix. The reed valve system is said to contribute to backfiring on decel. Is it coastered or still has the reeds? Adjusting the air screws on the carbs should also help.

Not sure how your crankcase filter is set up, but the hose should be clamped. Mine is mounted high where the right ear was, the hose from it runs into the stock hose at the engine, and is clamped there. Any low mounted filter on the stock 90 elbow hose will take more water from the front wheel.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
 
post #4 of 4 (permalink) Old 10-12-2015, 12:54 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,302
iTrader: (5)
   
These carbs also have a coast enrichment valve. If not working, could cause popping on decel.

Air leak at the carb can cause backfire on decel. Mine goes off like a cannon on long decel if I unplug the right side vacuum port (gets capped when you install coasters).

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster 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