Home arrow Forums



Go Back   XS11.com Forums > Idle Talk Forum > XS11/XJ11 Discussion

Reply
 
Thread Tools Display Modes
  #1  
Old 07-07-2013, 11:31 AM
DELL82's Avatar
DELL82 DELL82 is offline
XStremely XSive
 
Join Date: May 2006
Location: Houston, Texas
Posts: 260
Question Sectioned CV carb body

Does any one know of the thread/link showing a CV carb body that has been sectioned, cut with saw, to show the internal channels for air and fuel. Some time ago I was linked to a site or thread that had such a file. I copied it but have lost the file and cannot find it.
My problem is that, at idle, I am not getting fuel to the #4 carb, viewed using a color tune plug. When I open the enrichment ckt I get fire.
When I pull the plug after a long 100 mile ride the plugs are perfect, but at idle it runs on three cylinders.
I have pulled the top and bowl of the carb and blew out the available channels to no avail.
HELP
__________________
Dell82
Houston, TX
82' XJ1100J Maxim "LASERMAX"
SOLD 86' Kawasaki Voyager XII, 1200cc SOLD
SOLD 82' CB450SC Nighthawk, FOR SALE SOLD
SOLD 82' CB450SC Nighthawk, parts bike SOLD
Reply With Quote
  #2  
Old 07-07-2013, 12:56 PM
Tat2demon's Avatar
Tat2demon Tat2demon is offline
XSive Maximus
 
Join Date: Jun 2012
Location: Sioux Falls, South Dakota
Posts: 718
Have you checked the port to make sure you dont have a screw tip broken off in it?
__________________
Nate

78 XS11 "Matilda" 2H7 000364

2001 Raptor ACCT, T.C. Fuse Box, TC Bros Forward Controls
Kuryakyn Iso Grips/Throttleboss/Bar End Mirror, Custom Covered Seat
Shinko 712s, HID Headlight, RC Performance Exhaust
Bikemaster Daytona Handlebars, Galfer SS Brake Lines
Barnett HD Clutch Springs, T.C. Spin On Filter Adapter
K+N Air Filter

88 Voyager XII
81 XJ650 Maxim
Reply With Quote
  #3  
Old 07-07-2013, 02:16 PM
motoman motoman is offline
Master of XSology
 
Join Date: Aug 2005
Location: Grand Junction, Colorado
Posts: 8,309
Wink

Quote:
Originally Posted by Tat2demon View Post
Have you checked the port to make sure you dont have a screw tip broken off in it?
Could be a possibility, but unlikely as the later carb's idle mix. screws have a shoulder that hits BEFORE the needle tip seats(assuming these are XJ original carbs). The idle circuit IS still restricted from something that's not supossed to be in there not allowing vacuum to draw the fuel at lower rpm's. A weak spark at low rpm in that cyl. will also cause a low vacuum draw. Just throwin' out ideas to consider.
__________________
81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
Reply With Quote
  #4  
Old 07-07-2013, 02:45 PM
DELL82's Avatar
DELL82 DELL82 is offline
XStremely XSive
 
Join Date: May 2006
Location: Houston, Texas
Posts: 260
I have installed the DC-1 coils and have about 45K volts now. As seen in the color tune plug there is plenty of spark. My carbs are original and the adj, screws are flat not pointed. On assembly the screws were unscrewed 2.5 turns.
Still looking for the sectioned carb file.
Trying to find out where the vacuum comes from that sucks fuel through the bowl jet to the cylinder. When viewing the color tune plug zero fuel is coming until I open the enrichment ckt. then the flames are seen.
__________________
Dell82
Houston, TX
82' XJ1100J Maxim "LASERMAX"
SOLD 86' Kawasaki Voyager XII, 1200cc SOLD
SOLD 82' CB450SC Nighthawk, FOR SALE SOLD
SOLD 82' CB450SC Nighthawk, parts bike SOLD

Last edited by DELL82; 07-07-2013 at 02:52 PM. Reason: added info
Reply With Quote
  #5  
Old 07-07-2013, 03:19 PM
Rasputin's Avatar
Rasputin Rasputin is offline
XS-XJ Super Guru
 
Join Date: Apr 2008
Location: Lacombe, Alberta, Canada
Posts: 3,133
Try this thread and see if it helps any.
http://www.xs11.com/forum/showthread.php?t=20907&page=2
__________________
2-79 XS1100 SF
2-78 XS1100 E Best bike Ever
80 XS 1100 SG Big bore kit but not fully running yet.
Couple of more parts bikes of which 2 more will live!
Reply With Quote
  #6  
Old 07-07-2013, 05:53 PM
motoman motoman is offline
Master of XSology
 
Join Date: Aug 2005
Location: Grand Junction, Colorado
Posts: 8,309
Smile

Quote:
Originally Posted by DELL82 View Post
I have installed the DC-1 coils and have about 45K volts now. As seen in the color tune plug there is plenty of spark. My carbs are original and the adj, screws are flat not pointed. On assembly the screws were unscrewed 2.5 turns.
Still looking for the sectioned carb file.
Trying to find out where the vacuum comes from that sucks fuel through the bowl jet to the cylinder. When viewing the color tune plug zero fuel is coming until I open the enrichment ckt. then the flames are seen.
Haven't seen where you went to the extent of removing emulsion tubes after removing slides and main jets. If not, i would advise removing slides(don't mix them up or diaphram springs), remove main jets(don't loose washer under jet), and tap emulsion tube out top-side of carbs. Use a 38cal. nylon(no brass or metal allowed, period) bristle barrel cleaning brush and run up and down inside emulsion tubes to clean. Then use a wooden toothpic(again, no metal pins, paperclips, etc. allowed as any scoring WILL change flow charecteristics) and run into and spin around all the tiny side holes, same procedure for pilot jets....nothing metal allowed. Doing that to internal pieces will atleast eliminate that as an issue with idle circuit. If everything is done to carbs as far as cleaning to a T, no reason for idle circuit not to flow fuel.
__________________
81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
Reply With Quote
  #7  
Old 07-07-2013, 06:54 PM
natemoen's Avatar
natemoen natemoen is offline
Master of XSology
 
Join Date: May 2010
Location: Fargo
Posts: 8,624
Quote:
Originally Posted by DELL82 View Post
Trying to find out where the vacuum comes from that sucks fuel through the bowl jet to the cylinder.
The vacuum comes from the pistons moving up and down. As the piston moves down it sucks through the carb. As the air moves past the various holes in the carb it creates a low pressure area inside that hole and then sucks the fuel through the hole.
__________________
Nathan
KD9ARL

μολὼν λαβέ

1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner

In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

Theodore Roosevelt
Reply With Quote
  #8  
Old 07-07-2013, 07:03 PM
mlew's Avatar
mlew mlew is offline
XStremely XSive
 
Join Date: Jun 2005
Location: Apex , NC
Posts: 219
This is a great cutaway article on CV carbs from the XJbikes website.
http://www.xj4ever.com/inside%20your%20carbs.pdf
__________________
Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
Current rides:
80 XS1100SG
82 JX1100
83 Venture Royale
86 V-Max
Reply With Quote
  #9  
Old 07-07-2013, 07:49 PM
CaptonZap CaptonZap is offline
XS-XJ Guru
 
Join Date: Jun 2010
Location: Denver
Posts: 1,748
Quote:
Originally Posted by mlew View Post
This is a great cutaway article on CV carbs from the XJbikes website.
http://www.xj4ever.com/inside%20your%20carbs.pdf
Now that is a keeper! Thanks for sharing. CZ
Reply With Quote
  #10  
Old 07-07-2013, 08:35 PM
motoman motoman is offline
Master of XSology
 
Join Date: Aug 2005
Location: Grand Junction, Colorado
Posts: 8,309
Quote:
Originally Posted by natemoen View Post
The vacuum comes from the pistons moving up and down. As the piston moves down it sucks through the carb. As the air moves past the various holes in the carb it creates a low pressure area inside that hole and then sucks the fuel through the hole.
.......same as blowing across the top of a straw in a glass of water. Having said that, that's why fuel levels are critical. Stick that straw farther in the water, the less blow across the top it takes to lift fuel upward.....low fuel level equals more vacuum draw equals lean........high fuel levels equals less vacuum draw equals rich......'just right' equals good fuel/air ratio equals complete burn/combustion(or as close as can be expected).
__________________
81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
Reply With Quote
  #11  
Old 07-08-2013, 08:32 AM
DELL82's Avatar
DELL82 DELL82 is offline
XStremely XSive
 
Join Date: May 2006
Location: Houston, Texas
Posts: 260
Smile

I want to thank mlew and rasputin for the informative links, they are the ones I was looking for.
I also want to thank all other responders for their suggestions and thought, well done. I will study the cutaways and try and clear my carb passages. When all is well I will report what I found. Again many thanks to all.
__________________
Dell82
Houston, TX
82' XJ1100J Maxim "LASERMAX"
SOLD 86' Kawasaki Voyager XII, 1200cc SOLD
SOLD 82' CB450SC Nighthawk, FOR SALE SOLD
SOLD 82' CB450SC Nighthawk, parts bike SOLD
Reply With Quote
Reply

Tags
idle, sectioned carb

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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
Forum Jump


All times are GMT -6. The time now is 12:28 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Integrated by BBpixel ©2004-2022, jvbPlugin