Home arrow Forums



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

Reply
 
Thread Tools Display Modes
  #1  
Old 09-13-2017, 10:56 AM
rombat's Avatar
rombat rombat is offline
XSive
 
Join Date: Sep 2010
Location: Saskatoon, Saskatchewan
Posts: 26
Carb Sync Trouble

Trying to sync the carbs on my 1100xj. When I insert the YCIS tool the #2( octy port) vacuum goes way up and will not adjust. Without the blocking tool inserted the vacuum is even between #1 and #2. As I understand it the left screw syncs 1&2, the right screw syncs 3&4, and the center screw syncs the two sides to each other. I have done this bike before without this problem.
__________________
1100 Maxim (daily rider)
Reply With Quote
  #2  
Old 09-13-2017, 07:57 PM
rombat's Avatar
rombat rombat is offline
XSive
 
Join Date: Sep 2010
Location: Saskatoon, Saskatchewan
Posts: 26
I was hoping someone could give me an idea what I am doing wrong. I synced the carbs yesterday, completely forgot to insert the YICS blocking tool. Took me 15 mins, all 4 level. Decided to redo the sycn properly today with the tool in place. As mentioned the #2 vacuum doubled in height (mercury tube) with block inserted. Adjusting the screw between 1&2 made no difference,yet it worked yesterday. I finally gave up. A buddy has a different sync tool that I will borrow someday and try again.
__________________
1100 Maxim (daily rider)
Reply With Quote
  #3  
Old 09-14-2017, 07:02 AM
HalfCentury's Avatar
HalfCentury HalfCentury is offline
XStremely XSive
 
Join Date: Oct 2015
Location: Burlington NC
Posts: 405
It is possible that one or more of your ports are dirty/blocked. The ports have to be open/clean for the YICS system to work. Get in there with the equivalent of a rifle barrel cleaning rig and some solvent/cleaner.

I have owned an XJ650 and XJ1100 and did carbs and sync on both bikes.

You should ask on xjbikes.com where the YICS is discussed in much detail.

Some owners do not use the blocking tool and some owners do use the blocking tool.

You will know you have proper sync when the bike pulls like a freight train on the road.
__________________
82 XJ1100 - sold
96 Honda Magna 750 - Girlfriend's bike
2000 ZRX1100 - sold
2003 FJR1300 - Silver rocket
Reply With Quote
  #4  
Old 09-14-2017, 10:15 PM
rombat's Avatar
rombat rombat is offline
XSive
 
Join Date: Sep 2010
Location: Saskatoon, Saskatchewan
Posts: 26
Thanks. I brushed it out with a .375 nylon rifle brush before I started and again afterwards thinking the same thing as you, no difference.
__________________
1100 Maxim (daily rider)
Reply With Quote
  #5  
Old 09-15-2017, 09:25 AM
HalfCentury's Avatar
HalfCentury HalfCentury is offline
XStremely XSive
 
Join Date: Oct 2015
Location: Burlington NC
Posts: 405
How does it run with the blocking tool in place? It should run perfectly fine with blocking tool in place.
__________________
82 XJ1100 - sold
96 Honda Magna 750 - Girlfriend's bike
2000 ZRX1100 - sold
2003 FJR1300 - Silver rocket
Reply With Quote
  #6  
Old 09-15-2017, 01:15 PM
soccer4m soccer4m is offline
XSive Maximus
 
Join Date: Jul 2002
Location: san diego
Posts: 600
synch xj

Hi Half century,,,,just a thought,,,I also have an xj1100 and have synched it with the yics blocking tool and without it,,,,it didnt make a difference. It should with the tool in as each carb can be adjusted individually, but I have done with it in and not in and could still adjust the synch. SOOOo, try it without it in and try to synch them, by turning the outer screws for the outer cylinder pairs I can hear them smoothing out and rpm increase when they are synched, then adjust the center screw for a nice smooth sound from the engine. Also maybe one of your gauges is messed up, I had one that died so try switching around the vac tubes to the gauges and see if that makes a difference,,,,go xj...Mike in SUn Diego
__________________
mike
1982 xj1100 maxim
1980 xs1100 bagger
1981 250 IT
1959 wife
Reply With Quote
  #7  
Old 09-15-2017, 07:06 PM
HalfCentury's Avatar
HalfCentury HalfCentury is offline
XStremely XSive
 
Join Date: Oct 2015
Location: Burlington NC
Posts: 405
My sample size is exactly 2 bikes; an XJ650 and an XJ100. Not enough to make any generalizations about everybody else's XJ bike.

I do not think that the YICS port has a performance effect. I think that the YICS effect is emissions and backfiring (smoothness).
__________________
82 XJ1100 - sold
96 Honda Magna 750 - Girlfriend's bike
2000 ZRX1100 - sold
2003 FJR1300 - Silver rocket
Reply With Quote
  #8  
Old 09-15-2017, 08:08 PM
3Phase's Avatar
3Phase 3Phase is offline
XS-XJ Super Guru
 
Join Date: May 2008
Location: Simi Valley, CA
Posts: 5,090
Lightbulb YICS Tool - Use It

The YICS block-off tool makes a difference synchronizing the carburetors
and adjusting the idle mixture screws:-

Youtube / ThreeFaze / XJ1100 Carburetor Synchronizing ~ 40 seconds


Without the YICS tool before sync and mixture screw adjustment:
All 23 cmHg/hg

With the YICS tool before sync and mixture screw adjustment:
#1 25 cmHg
#2 20 cmHg
#3 17 cmHg
#4 23 cmHg

8 cmHg difference between high and low vacuum

With the YICS tool removed after sync and mixture screw adjustment:
All 20 cmHg
__________________
-- Scott
_____

1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk"
Reply With Quote
  #9  
Old 09-15-2017, 08:17 PM
skids's Avatar
skids skids is offline
XS-XJ Super Guru
 
Join Date: Jul 2002
Location: Florissant, CO, USA
Posts: 4,548
Question

Quote:
Originally Posted by 3Phase View Post
The YICS block-off tool makes a difference synchronizing the carburetors
and adjusting the idle mixture screws:-

Youtube / ThreeFaze / XJ1100 Carburetor Synchronizing ~ 40 seconds


Without the YICS tool before sync and mixture screw adjustment:
All 23 cmHg/hg

With the YICS tool before sync and mixture screw adjustment:
#1 25 cmHg
#2 20 cmHg
#3 17 cmHg
#4 23 cmHg

8 cmHg difference between high and low vacuum

With the YICS tool removed after sync and mixture screw adjustment:
All 20 cmHg
So it begs the question: If the carbs are synchronized with the tool, what good is the system? Is it for drifting out of synch???
__________________
Skids (Sid Hansen)

Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
Reply With Quote
  #10  
Old 09-15-2017, 10:34 PM
3Phase's Avatar
3Phase 3Phase is offline
XS-XJ Super Guru
 
Join Date: May 2008
Location: Simi Valley, CA
Posts: 5,090
Quote:
Originally Posted by skids View Post
So it begs the question: If the carbs are synchronized with the tool, what good is the system? Is it for drifting out of synch???
Unless the throttle shaft or adjuster screws are worn out then you really shouldn't have to fool with the YICS, sync and idle mixture. Once it's dialed in, it shouldn't change until you do something like R&R/clean/rebuild the carbs or change the valve shims.

Obviously, the synch and idle mixture adjustment will change slightly after you replace the cam chain, lap the valves, or hone the cylinders so you'll need the YICS tool to tune as the parts break in. After I reworked the engine in my XJ and took off for the Kremmling rally, I forgot to bring the tool and DiverRay brought his vacuum gauge set. I try to remember to keep it stashed on the frame now so it stays with the bike and there's no drama when I want to use it.
__________________
-- Scott
_____

1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk"
Reply With Quote
  #11  
Old 09-16-2017, 08:05 PM
TopCatGr58's Avatar
TopCatGr58 TopCatGr58 is offline
Administrator
 
Join Date: Jul 2002
Location: Portsmouth, Va.
Posts: 12,541
Hey Skids,

Read all about it here:

http://xj4ever.com/catalog/yics.html

T.C.
Reply With Quote
  #12  
Old 09-16-2017, 09:03 PM
skids's Avatar
skids skids is offline
XS-XJ Super Guru
 
Join Date: Jul 2002
Location: Florissant, CO, USA
Posts: 4,548
Quote:
Originally Posted by TopCatGr58 View Post
Hey Skids,

Read all about it here:

http://xj4ever.com/catalog/yics.html

T.C.
Thanks TC, for my info.
__________________
Skids (Sid Hansen)

Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
Reply With Quote
Reply

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 09:46 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Integrated by BBpixel ©2004-2017, jvbPlugin