number 3 carb issues

[wjw11teen]

just got everything back together and tried to sync carbs

no good....i first tried to adjust air screws and could get results on all but #3..

i can turn the screw all the way in and all the way out and no changes is made on carb #3

i even took it all the way out and the engine still ran...but i could hear the sound of vaccume through the hole..

i could get carbs 1&2 and 3&4 to sync but not 1&2 to 3&4

this freakin bike is starting to get on my nerves....up to $2000 and countless hours and rode it about 40 miles

if i cant get it tuned and reliable soon its gonna be for sale

till then, any ideas i would appreciate

[BA80]

There be demons in that #3 carb.

#3 is the master carb of the 4. You've just got some linkage binding somewhere, somehow there. My first educated guess would be a boot clamp interfering with the throttle cable link.

[TopCatGr58]

Hey there,

Well, you're talking about 2 different things....the air/fuel mixture screws adjust the Pilot Jet circuits....they are the ones on the top front of each carb throat...the one you took out to be able to hear vacuum sound. Being able to hear the vac. sound is good in that you don't have a tip broken off down in the pilot jet screw hole!

The SYNCH screws are on the thottle plate/lever and they are what you want to adjust to perform the VAC. Synch of the carbs.

T.C.

[motoman]

just got everything back together and tried to sync carbs

no good....i first tried to adjust air screws and could get results on all but #3..

i can turn the screw all the way in and all the way out and no changes is made on carb #3

i even took it all the way out and the engine still ran...but i could hear the sound of vaccume through the hole..

i could get carbs 1&2 and 3&4 to sync but not 1&2 to 3&4

this freakin bike is starting to get on my nerves....up to $2000 and countless hours and rode it about 40 miles

if i cant get it tuned and reliable soon its gonna be for sale

till then, any ideas i would appreciate

Idle circuit plugged. Pilot jet removal and magnifying glass inspection of it and blowing cleaner through that circuit again may solve the problem.

[BA80]

Hey there,

Well, you're talking about 2 different things....the air/fuel mixture screws adjust the Pilot Jet circuits....they are the ones on the top front of each carb throat...the one you took out to be able to hear vacuum sound. Being able to hear the vac. sound is good in that you don't have a tip broken off down in the pilot jet screw hole! The SYNCH screws are on the thottle plate/lever and they are what you want to adjust to perform the VAC. Synch of the carbs.

T.C.

Sounded like he's trying to sync to me.

[wjw11teen]

i know its two different things im wondering if the air screw issue would have that big an impact on the sync process


im gonna take carbs off AGAIN tomorrow and see what i can see

if i can hear vaccume then there shouldnt be a blockage in the circuit.....right???

[TopCatGr58]

if i can hear vacuum then there shouldnt be a blockage in the circuit.....right???

No, because the pilot jet screw tower opens into the little hole in the carb throat in the front of the carb body. The engine is sucking thru the carb throat, and so pulling the screw allowed you to just hear the vacuum on the front of the carb. However, the pilot circuit behind/rearward of that point can still be blocked so no or little fuel/air mix is getting into that little hole!

T.C.

[wjw11teen]

gotcha thanks for that...

hey fellas really appreciate all the info and advice on here

im going back to carb drawing board tomorrow

getting super frustrated with all the stupid little issues on this thing


its like being married to a super model...

I JUST WANNA RIDE!!!!!

[BA80]

its like being married to a super model...

I JUST WANNA RIDE!!!!!

But think of how you would feel waking up next to her. That's the goal.


If you can't pull 1&2 and 3&4 together with the sync then something is binding somewhere or your just WAYYYYY off and it's going to take a lot of turns on the screw to get it to pull together.

I ran into that today on a Virago I was working on and it only has 2 carbs.

[motoman]

i know its two different things im wondering if the air screw issue would have that big an impact on the sync process


im gonna take carbs off AGAIN tomorrow and see what i can see

if i can hear vaccume then there shouldnt be a blockage in the circuit.....right???

I assume you know that is a fuel mixture adjustment, not air mixture........

[motoman]

know its two different things im wondering if the air screw issue would have that big an impact on the sync process


Pretty much dependent on it.....no matter which carb.

[wjw11teen]

looking on the site for how to bench sync carbs....cant find it...

could someone put up a link please? thanks

[bikerphil]

http://www.xs11.com/xs11-info/tech-t...rburetors.html

[wjw11teen]

AWSOME !! thanks Phil

thats what i needed to know ....now....wish me luck

[BA80]

There is this method too Bill......

http://www.xs11.com/forum/showthread.php?t=36021

I usually just hold them up to a light and set them so there is just a sliver of light showing equally in all 4. That get's 'em pretty close for me.